/*
 * Copyright (C) 2008,2009  OMRON SOFTWARE Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package jp.co.omronsoft.openwnn;


import jp.co.omronsoft.openwnn.EN.OpenWnnEngineEN;
import jp.co.omronsoft.openwnn.JAJP.*;
import android.content.SharedPreferences;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Handler;
import android.os.Message;
import android.preference.PreferenceManager;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.BackgroundColorSpan;
import android.text.style.CharacterStyle;
import android.text.style.ForegroundColorSpan;
import android.text.style.UnderlineSpan;
import android.util.Log;
import android.view.KeyEvent;
import android.view.inputmethod.EditorInfo;
import android.view.MotionEvent;
import android.view.View;
import android.view.KeyCharacterMap;
import android.text.method.MetaKeyKeyListener;

import java.util.regex.Pattern;
import java.util.regex.Matcher;

/**
 * The OpenWnn Japanese IME class
 *
 * @author Copyright (C) 2009 OMRON SOFTWARE CO., LTD.  All Rights Reserved.
 */
public class OpenWnnJAJP extends OpenWnn {
    /**
     * Mode of the convert engine (Full-width KATAKANA).
     * Use with {@code OpenWnn.CHANGE_MODE} event.
     */
    public static final int ENGINE_MODE_FULL_KATAKANA = 101;

    /**
     * Mode of the convert engine (Half-width KATAKANA).
     * Use with {@code OpenWnn.CHANGE_MODE} event.
     */
    public static final int ENGINE_MODE_HALF_KATAKANA = 102;

    /**
     * Mode of the convert engine (EISU-KANA conversion).
     * Use with {@code OpenWnn.CHANGE_MODE} event.
     */
    public static final int ENGINE_MODE_EISU_KANA = 103;

    /**
     * Mode of the convert engine (Symbol list).
     * Use with {@code OpenWnn.CHANGE_MODE} event.
     */
    public static final int ENGINE_MODE_SYMBOL = 104;

    /**
     * Mode of the convert engine (Keyboard type is QWERTY).
     * Use with {@code OpenWnn.CHANGE_MODE} event to change ambiguous searching pattern.
     */
    public static final int ENGINE_MODE_OPT_TYPE_QWERTY = 105;

    /**
     * Mode of the convert engine (Keyboard type is 12-keys).
     * Use with {@code OpenWnn.CHANGE_MODE} event to change ambiguous searching pattern.
     */
    public static final int ENGINE_MODE_OPT_TYPE_12KEY = 106;

    /** Never move cursor in to the composing text (adapting to IMF's specification change) */
    private static final boolean FIX_CURSOR_TEXT_END = true;

    /** Highlight color style for the converted clause */
    private static final CharacterStyle SPAN_CONVERT_BGCOLOR_HL   = new BackgroundColorSpan(0xFF8888FF);
    /** Highlight color style for the selected string  */
    private static final CharacterStyle SPAN_EXACT_BGCOLOR_HL     = new BackgroundColorSpan(0xFF66CDAA);
    /** Highlight color style for EISU-KANA conversion */
    private static final CharacterStyle SPAN_EISUKANA_BGCOLOR_HL  = new BackgroundColorSpan(0xFF9FB6CD);
    /** Highlight color style for the composing text */
    private static final CharacterStyle SPAN_REMAIN_BGCOLOR_HL    = new BackgroundColorSpan(0xFFF0FFFF);
    /** Highlight text color */
    private static final CharacterStyle SPAN_TEXTCOLOR  = new ForegroundColorSpan(0xFF000000);
    /** Underline style for the composing text */
    private static final CharacterStyle SPAN_UNDERLINE            = new UnderlineSpan();

    /** IME's status for {@code mStatus} input/no candidates). */
    private static final int STATUS_INIT            = 0x0000;
    /** IME's status for {@code mStatus}(input characters). */
    private static final int STATUS_INPUT           = 0x0001;
    /** IME's status for {@code mStatus}(input functional keys). */
    private static final int STATUS_INPUT_EDIT      = 0x0003;
    /** IME's status for {@code mStatus}(all candidates are displayed). */
    private static final int STATUS_CANDIDATE_FULL  = 0x0010;

    /** Alphabet-last pattern */
    private static final Pattern ENGLISH_CHARACTER_LAST = Pattern.compile(".*[a-zA-Z]$");

    /**
     *  Private area character code got by {@link KeyEvent#getUnicodeChar()}.
     *   (SHIFT+ALT+X G1 specific)
     */
    private static final int PRIVATE_AREA_CODE = 61184;

    /** Maximum length of input string */
    private static final int LIMIT_INPUT_NUMBER = 30;

    /** Bit flag for English auto commit mode (ON) */
    private static final int AUTO_COMMIT_ENGLISH_ON      = 0x0000;
    /** Bit flag for English auto commit mode (OFF) */
    private static final int AUTO_COMMIT_ENGLISH_OFF     = 0x0001;
    /** Bit flag for English auto commit mode (symbol list) */
    private static final int AUTO_COMMIT_ENGLISH_SYMBOL  = 0x0010;

    /** Message for {@code mHandler} (execute prediction) */
    private static final int MSG_PREDICTION = 0;

    /** Message for {@code mHandler} (execute tutorial) */
    private static final int MSG_START_TUTORIAL = 1;

    /** Message for {@code mHandler} (close) */
    private static final int MSG_CLOSE = 2;

    /** Delay time(msec.) to start prediction after key input when the candidates view is not shown. */
    private static final int PREDICTION_DELAY_MS_1ST = 200;

    /** Delay time(msec.) to start prediction after key input when the candidates view is shown. */
    private static final int PREDICTION_DELAY_MS_SHOWING_CANDIDATE = 200;
    

    /** Convert engine's state */
    private class EngineState {
        /** Definition for {@code EngineState.*} (invalid) */
        public static final int INVALID = -1;

        /** Definition for {@code EngineState.dictionarySet} (Japanese) */
        public static final int DICTIONARYSET_JP = 0;

        /** Definition for {@code EngineState.dictionarySet} (English) */
        public static final int DICTIONARYSET_EN = 1;

        /** Definition for {@code EngineState.convertType} (prediction/no conversion) */
        public static final int CONVERT_TYPE_NONE = 0;

        /** Definition for {@code EngineState.convertType} (consecutive clause conversion) */
        public static final int CONVERT_TYPE_RENBUN = 1;

        /** Definition for {@code EngineState.convertType} (EISU-KANA conversion) */
        public static final int CONVERT_TYPE_EISU_KANA = 2;

        /** Definition for {@code EngineState.temporaryMode} (change back to the normal dictionary) */
        public static final int TEMPORARY_DICTIONARY_MODE_NONE = 0;

        /** Definition for {@code EngineState.temporaryMode} (change to the symbol dictionary) */
        public static final int TEMPORARY_DICTIONARY_MODE_SYMBOL = 1;

        /** Definition for {@code EngineState.temporaryMode} (change to the user dictionary) */
        public static final int TEMPORARY_DICTIONARY_MODE_USER = 2;

        /** Definition for {@code EngineState.preferenceDictionary} (no preference dictionary) */
        public static final int PREFERENCE_DICTIONARY_NONE = 0;

        /** Definition for {@code EngineState.preferenceDictionary} (person's name) */
        public static final int PREFERENCE_DICTIONARY_PERSON_NAME = 1;

        /** Definition for {@code EngineState.preferenceDictionary} (place name) */
        public static final int PREFERENCE_DICTIONARY_POSTAL_ADDRESS = 2;

        /** Definition for {@code EngineState.preferenceDictionary} (email/URI) */
        public static final int PREFERENCE_DICTIONARY_EMAIL_ADDRESS_URI = 3;

        /** Definition for {@code EngineState.keyboard} (undefined) */
        public static final int KEYBOARD_UNDEF = 0;

        /** Definition for {@code EngineState.keyboard} (QWERTY) */
        public static final int KEYBOARD_QWERTY = 1;

        /** Definition for {@code EngineState.keyboard} (12-keys) */
        public static final int KEYBOARD_12KEY  = 2;

        /** Set of dictionaries */
        public int dictionarySet = INVALID;

        /** Type of conversion */
        public int convertType = INVALID;

        /** Temporary mode */
        public int temporaryMode = INVALID;

        /** Preference dictionary setting */
        public int preferenceDictionary = INVALID;

        /** keyboard */
        public int keyboard = INVALID;

        /**
         * Returns whether current type of conversion is consecutive clause(RENBUNSETSU) conversion.
         * 
         * @return {@code true} if current type of conversion is consecutive clause conversion.
         */
        public boolean isRenbun() {
            return convertType == CONVERT_TYPE_RENBUN;
        }

        /**
         * Returns whether current type of conversion is EISU-KANA conversion.
         * 
         * @return {@code true} if current type of conversion is EISU-KANA conversion.
         */
        public boolean isEisuKana() {
            return convertType == CONVERT_TYPE_EISU_KANA;
        }

        /**
         * Returns whether current type of conversion is no conversion.
         * 
         * @return {@code true} if no conversion is executed currently.
         */
        public boolean isConvertState() {
            return convertType != CONVERT_TYPE_NONE;
        }

        /**
         * Check whether or not the mode is "symbol list".
         * 
         * @return {@code true} if the mode is "symbol list".
         */
        public boolean isSymbolList() {
            return temporaryMode == TEMPORARY_DICTIONARY_MODE_SYMBOL;
        }

        /**
         * Check whether or not the current language is English.
         * 
         * @return {@code true} if the current language is English.
         */
        public boolean isEnglish() {
            return dictionarySet == DICTIONARYSET_EN;
        }
    }

    /** IME's status */
    protected int mStatus = STATUS_INIT;

    /** Whether exact match searching or not */
    protected boolean mExactMatchMode = false;

    /** Spannable string builder for displaying the composing text */
    protected SpannableStringBuilder mDisplayText;

    /** Instance of this service */
    private static OpenWnnJAJP mSelf = null;

    /** Backup for switching the converter */
    private WnnEngine mConverterBack;

    /** Backup for switching the pre-converter */
    private LetterConverter mPreConverterBack;

    /** OpenWnn conversion engine for Japanese */
    private OpenWnnEngineJAJP mConverterJAJP;

    /** OpenWnn conversion engine for English */
    private OpenWnnEngineEN mConverterEN;

    /** Conversion engine for listing symbols */
    private SymbolList mConverterSymbolEngineBack;

    /** Symbol lists to display when the symbol key is pressed */
    private static final String[] SYMBOL_LISTS = {
    	SymbolList.SYMBOL_JAPANESE_FACE, SymbolList.SYMBOL_JAPANESE, SymbolList.SYMBOL_ENGLISH
    };

    /** Current symbol list */
    private int mCurrentSymbol = 0;

    /** Romaji-to-Kana converter (HIRAGANA) */
    private Romkan mPreConverterHiragana;

    /** Romaji-to-Kana converter (full-width KATAKANA) */
    private RomkanFullKatakana mPreConverterFullKatakana;

    /** Romaji-to-Kana converter (half-width KATAKANA) */
    private RomkanHalfKatakana mPreConverterHalfKatakana;

    /** Conversion Engine's state */
    private EngineState mEngineState = new EngineState();

    /** Whether learning function is active of not. */
    private boolean mEnableLearning = true;

    /** Whether prediction is active or not. */
    private boolean mEnablePrediction = true;

    /** Whether using the converter */
    private boolean mEnableConverter = true;

    /** Whether displaying the symbol list */
    private boolean mEnableSymbolList = true;

    /** Whether non ASCII code is enabled */
    private boolean mEnableSymbolListNonHalf = true;

    /** Enable mistyping spell correction or not */
    private boolean mEnableSpellCorrection = true;

    /** Auto commit state (in English mode) */
    private int mDisableAutoCommitEnglishMask = AUTO_COMMIT_ENGLISH_ON;

    /** Whether removing a space before a separator or not. (in English mode) */
    private boolean mEnableAutoDeleteSpace = false;

    /** Whether auto-spacing is enabled or not. */
    private boolean mEnableAutoInsertSpace = true;

    /** Whether dismissing the keyboard when the enter key is pressed */
    private boolean mEnableAutoHideKeyboard = true;

    /** Number of committed clauses on consecutive clause conversion */
    private int mCommitCount = 0;

    /** Target layer of the {@link ComposingText} */
    private int mTargetLayer = 1;

    /** Current orientation of the display */
    private int mOrientation = Configuration.ORIENTATION_UNDEFINED;

    /** Current normal dictionary set */
    private int mPrevDictionarySet = OpenWnnEngineJAJP.DIC_LANG_INIT;

    /** Regular expression pattern for English separators */
    private  Pattern mEnglishAutoCommitDelimiter = null;

    /** Cursor position in the composing text */
    private int mComposingStartCursor = 0;

    /** Cursor position before committing text */
    private int mCommitStartCursor = 0;

    /** Previous committed text */
    private StringBuffer mPrevCommitText = null;

    /** Call count of {@code commitText} */
    private int mPrevCommitCount = 0;

    /** Shift lock status of the Hardware keyboard */
    private int mHardShift;

    /** SHIFT key state (pressing) */
    private boolean mShiftPressing;

    /** ALT lock status of the Hardware keyboard */
    private int mHardAlt;

    /** ALT key state (pressing) */
    private boolean mAltPressing;

    /** Shift lock toggle definition */
    private static final int[] mShiftKeyToggle = {0, MetaKeyKeyListener.META_SHIFT_ON, MetaKeyKeyListener.META_CAP_LOCKED};

    /** ALT lock toggle definition */
    private static final int[] mAltKeyToggle = {0, MetaKeyKeyListener.META_ALT_ON, MetaKeyKeyListener.META_ALT_LOCKED};

    /** Auto caps mode */
    private boolean mAutoCaps = false;

    /** List of words in the user dictionary */
    private WnnWord[] mUserDictionaryWords = null;
    
    /** Tutorial */
    private TutorialJAJP mTutorial;

    /** Whether tutorial mode or not */
    private boolean mEnableTutorial;

    /** Whether there is a continued predicted candidate */
    private boolean mHasContinuedPrediction = false;

    /** {@code Handler} for drawing candidates/displaying tutorial */
    Handler mHandler = new Handler() {
            @Override
                public void handleMessage(Message msg) {
                switch (msg.what) {
                case MSG_PREDICTION:
                    updatePrediction();
                    break;
                case MSG_START_TUTORIAL:
                    if (mTutorial == null) {
                        if (isInputViewShown()) {
                            DefaultSoftKeyboardJAJP inputManager = ((DefaultSoftKeyboardJAJP) mInputViewManager);
                            View v = inputManager.getKeyboardView();
                            mTutorial = new TutorialJAJP(OpenWnnJAJP.this, v, inputManager);
                                                         
                            mTutorial.start();
                        } else {
                            /* Try again soon if the view is not yet showing */
                            sendMessageDelayed(obtainMessage(MSG_START_TUTORIAL), 100);
                        }
                    }
                    break;
                case MSG_CLOSE:
                    if (mConverterJAJP != null) mConverterJAJP.close();
                    if (mConverterEN != null) mConverterEN.close();
                    if (mConverterSymbolEngineBack != null) mConverterSymbolEngineBack.close();
                    break;
                }
            }
        };

    /** The candidate filter */
    private CandidateFilter mFilter;

    /**
     * Constructor
     */
    public OpenWnnJAJP() {
        super();
        mSelf = this;
        mComposingText = new ComposingText();
        mCandidatesViewManager = new TextCandidatesViewManager(-1);
        mInputViewManager  = new DefaultSoftKeyboardJAJP();
        mConverter = mConverterJAJP = new OpenWnnEngineJAJP("/data/data/jp.co.omronsoft.openwnn/writableJAJP.dic");
        mConverterEN = new OpenWnnEngineEN("/data/data/jp.co.omronsoft.openwnn/writableEN.dic");
        mPreConverter = mPreConverterHiragana = new Romkan();
        mPreConverterFullKatakana = new RomkanFullKatakana();
        mPreConverterHalfKatakana = new RomkanHalfKatakana();
        mFilter = new CandidateFilter();

        mDisplayText = new SpannableStringBuilder();
        mAutoHideMode = false;

        mPrevCommitText = new StringBuffer();
    }

    /**
     * Constructor
     *
     * @param context       The context
     */
    public OpenWnnJAJP(Context context) {
        this();
        attachBaseContext(context);
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onCreate */
    @Override public void onCreate() {
        super.onCreate();

        String delimiter = Pattern.quote(getResources().getString(R.string.en_word_separators));
        mEnglishAutoCommitDelimiter = Pattern.compile(".*[" + delimiter + "]$");
        if (mConverterSymbolEngineBack == null) {
            mConverterSymbolEngineBack = new SymbolList(this, SymbolList.LANG_JA);
        }
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onCreateInputView */
    @Override public View onCreateInputView() {
        int hiddenState = getResources().getConfiguration().hardKeyboardHidden;
        boolean hidden = (hiddenState == Configuration.HARDKEYBOARDHIDDEN_YES);
        ((DefaultSoftKeyboardJAJP) mInputViewManager).setHardKeyboardHidden(hidden);
        mEnableTutorial = hidden;
        return super.onCreateInputView();
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onStartInputView */
    @Override public void onStartInputView(EditorInfo attribute, boolean restarting) {

        EngineState state = new EngineState();
        state.temporaryMode = EngineState.TEMPORARY_DICTIONARY_MODE_NONE;
        updateEngineState(state);

        mPrevCommitCount = 0;
        clearCommitInfo();

        ((DefaultSoftKeyboard) mInputViewManager).resetCurrentKeyboard();

        super.onStartInputView(attribute, restarting);

        /* initialize views */
        mCandidatesViewManager.clearCandidates();
        /* initialize status */
        mStatus = STATUS_INIT;
        mExactMatchMode = false;       
        /* load preferences */
        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);

        /* hardware keyboard support */
        mHardShift = 0;
        mHardAlt   = 0;
        updateMetaKeyStateDisplay();

        /* initialize the engine's state */
        fitInputType(pref, attribute);

        ((TextCandidatesViewManager)mCandidatesViewManager).setAutoHide(true);

        if (isEnableL2Converter()) {
            breakSequence();
        }
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#hideWindow */
    @Override public void hideWindow() {
        mComposingText.clear();
        mInputViewManager.onUpdateState(this);
        clearCommitInfo();
        mHandler.removeMessages(MSG_START_TUTORIAL);
        mInputViewManager.closing();
        if (mTutorial != null) {
            mTutorial.close();
            mTutorial = null;
        }

        super.hideWindow();
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onUpdateSelection */
    @Override public void onUpdateSelection(int oldSelStart, int oldSelEnd, int newSelStart, int newSelEnd, int candidatesStart, int candidatesEnd) {

        mComposingStartCursor = (candidatesStart < 0) ? newSelEnd : candidatesStart;

        if (newSelStart != newSelEnd) {
            clearCommitInfo();
        }

        if (mHasContinuedPrediction) {
            mHasContinuedPrediction = false;
            if (0 < mPrevCommitCount) {
                mPrevCommitCount--;
            }
            return;
        }

        boolean isNotComposing = ((candidatesStart < 0) && (candidatesEnd < 0));
        if ((mComposingText.size(ComposingText.LAYER1) != 0)
            && !isNotComposing) {
            updateViewStatus(mTargetLayer, false, true);
        } else {
            if (0 < mPrevCommitCount) {
                mPrevCommitCount--;
            } else {
                int commitEnd = mCommitStartCursor + mPrevCommitText.length();
                if ((((newSelEnd < oldSelEnd) || (commitEnd < newSelEnd)) && clearCommitInfo())
                    || isNotComposing) {
                    if (isEnableL2Converter()) {
                        breakSequence();
                    }

                    if (mInputConnection != null) {
                        if (isNotComposing && (mComposingText.size(ComposingText.LAYER1) != 0)) {
                            mInputConnection.finishComposingText();
                        }
                    }
                    initializeScreen();
                }
            }
        }
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onConfigurationChanged */
    @Override public void onConfigurationChanged(Configuration newConfig) {
        try {
            super.onConfigurationChanged(newConfig);
            
            if (mInputConnection != null) {
                if (super.isInputViewShown()) {
                    updateViewStatus(mTargetLayer, true, true);
                }

                /* display orientation */
                if (mOrientation != newConfig.orientation) {
                    mOrientation = newConfig.orientation;
                    commitConvertingText();
                    initializeScreen();
                }

                /* Hardware keyboard */
                int hiddenState = newConfig.hardKeyboardHidden;
                boolean hidden = (hiddenState == Configuration.HARDKEYBOARDHIDDEN_YES);
                ((DefaultSoftKeyboardJAJP) mInputViewManager).setHardKeyboardHidden(hidden);
                mEnableTutorial = hidden;
            }
        } catch (Exception ex) {
            /* do nothing if an error occurs. */
        }
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onEvent */
    @Override synchronized public boolean onEvent(OpenWnnEvent ev) {

        EngineState state;

        /* handling events which are valid when InputConnection is not active. */
        switch (ev.code) {
        
        case OpenWnnEvent.KEYUP:
            onKeyUpEvent(ev.keyEvent);
            return true;
            
        case OpenWnnEvent.INITIALIZE_LEARNING_DICTIONARY:
            mConverterEN.initializeDictionary(WnnEngine.DICTIONARY_TYPE_LEARN);
            mConverterJAJP.initializeDictionary(WnnEngine.DICTIONARY_TYPE_LEARN);
            return true;

        case OpenWnnEvent.INITIALIZE_USER_DICTIONARY:
            return mConverterJAJP.initializeDictionary( WnnEngine.DICTIONARY_TYPE_USER );

        case OpenWnnEvent.LIST_WORDS_IN_USER_DICTIONARY:
            mUserDictionaryWords = mConverterJAJP.getUserDictionaryWords( );
            return true;

        case OpenWnnEvent.GET_WORD:
            if (mUserDictionaryWords != null) {
                ev.word = mUserDictionaryWords[0];
                for (int i = 0 ; i < mUserDictionaryWords.length - 1 ; i++) {
                    mUserDictionaryWords[i] = mUserDictionaryWords[i + 1];
                }
                mUserDictionaryWords[mUserDictionaryWords.length - 1] = null;
                if (mUserDictionaryWords[0] == null) {
                    mUserDictionaryWords = null;
                }
                return true;
            }
            break;

        case OpenWnnEvent.ADD_WORD:
            mConverterJAJP.addWord(ev.word);
            return true;

        case OpenWnnEvent.DELETE_WORD:
            mConverterJAJP.deleteWord(ev.word);
            return true;

        case OpenWnnEvent.CHANGE_MODE:
            changeEngineMode(ev.mode);
            if (!(ev.mode == ENGINE_MODE_SYMBOL || ev.mode == ENGINE_MODE_EISU_KANA)) {
                initializeScreen();
            }
            return true;

        case OpenWnnEvent.UPDATE_CANDIDATE:
            if (mEngineState.isRenbun()) {
                mComposingText.setCursor(ComposingText.LAYER1,
                                         mComposingText.toString(ComposingText.LAYER1).length());
                mExactMatchMode = false;
                updateViewStatusForPrediction(true, true);
            } else {
                updateViewStatus(mTargetLayer, true, true);
            }
            return true;

        case OpenWnnEvent.CHANGE_INPUT_VIEW:
            setInputView(onCreateInputView());
            return true;

        case OpenWnnEvent.CANDIDATE_VIEW_TOUCH:
            boolean ret;
            ret = ((TextCandidatesViewManager)mCandidatesViewManager).onTouchSync();
            return ret;

        case OpenWnnEvent.TOUCH_OTHER_KEY:
            mStatus |= STATUS_INPUT_EDIT;
            return true;

        default:
            break;
        }

        KeyEvent keyEvent = ev.keyEvent;
        int keyCode = 0;
        if (keyEvent != null) {
            keyCode = keyEvent.getKeyCode();
        }

        if (mDirectInputMode) {
            if (ev.code == OpenWnnEvent.INPUT_SOFT_KEY && mInputConnection != null) {
                mInputConnection.sendKeyEvent(keyEvent);
                mInputConnection.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP,
                                                           keyEvent.getKeyCode()));
            }

            /* return if InputConnection is not active */
            return false;
        }
        
        if (!((ev.code == OpenWnnEvent.COMMIT_COMPOSING_TEXT)
              || ((keyEvent != null)
                  && ((keyCode == KeyEvent.KEYCODE_SHIFT_LEFT)
                      || (keyCode == KeyEvent.KEYCODE_SHIFT_RIGHT)
                      || (keyCode == KeyEvent.KEYCODE_ALT_LEFT)
                      || (keyCode == KeyEvent.KEYCODE_ALT_RIGHT)
                      || (keyEvent.isAltPressed() && (keyCode == KeyEvent.KEYCODE_SPACE)))))) {

            clearCommitInfo();
        }       
                
        /* change back the dictionary if necessary */
        if (!((ev.code == OpenWnnEvent.SELECT_CANDIDATE)
              || (ev.code == OpenWnnEvent.LIST_CANDIDATES_NORMAL)
              || (ev.code == OpenWnnEvent.LIST_CANDIDATES_FULL)
              || ((keyEvent != null)
                  && ((keyCode == KeyEvent.KEYCODE_SHIFT_LEFT)
                      ||(keyCode == KeyEvent.KEYCODE_SHIFT_RIGHT)
                      ||(keyCode == KeyEvent.KEYCODE_ALT_LEFT)
                      ||(keyCode == KeyEvent.KEYCODE_ALT_RIGHT)
                      ||(keyCode == KeyEvent.KEYCODE_BACK && mCandidatesViewManager.getViewType() == CandidatesViewManager.VIEW_TYPE_FULL)
                      ||(keyEvent.isAltPressed() && (keyCode == KeyEvent.KEYCODE_SPACE)))))) {

            state = new EngineState();
            state.temporaryMode = EngineState.TEMPORARY_DICTIONARY_MODE_NONE;
            updateEngineState(state);
        }

        if (ev.code == OpenWnnEvent.LIST_CANDIDATES_FULL) {
            mStatus |= STATUS_CANDIDATE_FULL;
            mCandidatesViewManager.setViewType(CandidatesViewManager.VIEW_TYPE_FULL);
            return true;
        } else if (ev.code == OpenWnnEvent.LIST_CANDIDATES_NORMAL) {
            mStatus &= ~STATUS_CANDIDATE_FULL;
            mCandidatesViewManager.setViewType(CandidatesViewManager.VIEW_TYPE_NORMAL);
            return true;
        }

        boolean ret = false;
        switch (ev.code) {
        case OpenWnnEvent.INPUT_CHAR:
            if ((mPreConverter == null) && !isEnableL2Converter()) {
                /* direct input (= full-width alphabet/number input) */
                commitText(false);
                commitText(new String(ev.chars));
                mCandidatesViewManager.clearCandidates();
            } else if (!isEnableL2Converter()) {
                processSoftKeyboardCodeWithoutConversion(ev.chars);
            } else {
                processSoftKeyboardCode(ev.chars);
            }
            ret = true;
            break;

        case OpenWnnEvent.TOGGLE_CHAR:
            processSoftKeyboardToggleChar(ev.toggleTable);
            ret = true;
            break;

        case OpenWnnEvent.TOGGLE_REVERSE_CHAR:
            if (((mStatus & ~STATUS_CANDIDATE_FULL) == STATUS_INPUT)
                && !(mEngineState.isConvertState())) {

                int cursor = mComposingText.getCursor(ComposingText.LAYER1);
                if (cursor > 0) {
                    String prevChar = mComposingText.getStrSegment(ComposingText.LAYER1, cursor - 1).string;
                    String c = searchToggleCharacter(prevChar, ev.toggleTable, true);
                    if (c != null) {
                        mComposingText.delete(ComposingText.LAYER1, false);
                        appendStrSegment(new StrSegment(c));
                        updateViewStatusForPrediction(true, true);
                        ret = true;
                        break;
                    }
                }
            }
            break;

        case OpenWnnEvent.REPLACE_CHAR:
            int cursor = mComposingText.getCursor(ComposingText.LAYER1);
            if ((cursor > 0)
                && !(mEngineState.isConvertState())) {

                String search = mComposingText.getStrSegment(ComposingText.LAYER1, cursor - 1).string;
                String c = (String)ev.replaceTable.get(search);
                if (c != null) {
                    mComposingText.delete(1, false);
                    appendStrSegment(new StrSegment(c));
                    updateViewStatusForPrediction(true, true);
                    ret = true;
                    mStatus = STATUS_INPUT_EDIT;
                    break;
                }
            }
            break;

        case OpenWnnEvent.INPUT_KEY:
            /* update shift/alt state */
            switch (keyCode) {
            case KeyEvent.KEYCODE_DPAD_DOWN:
            case KeyEvent.KEYCODE_DPAD_LEFT:
            case KeyEvent.KEYCODE_DPAD_RIGHT:
            case KeyEvent.KEYCODE_DPAD_UP:
                if (mTutorial != null) {
                    return true;
                }
                break;
            
            case KeyEvent.KEYCODE_ALT_LEFT:
            case KeyEvent.KEYCODE_ALT_RIGHT:
                if (keyEvent.getRepeatCount() == 0) {
                    if (++mHardAlt > 2) { mHardAlt = 0; }
                }
                mAltPressing   = true;
                updateMetaKeyStateDisplay();
                return true;

            case KeyEvent.KEYCODE_SHIFT_LEFT:
            case KeyEvent.KEYCODE_SHIFT_RIGHT:
                if (keyEvent.getRepeatCount() == 0) {
                    if (++mHardShift > 2) { mHardShift = 0; }
                }
                mShiftPressing = true;
                updateMetaKeyStateDisplay();
                return true;
            }

            /* handle other key event */
            ret = processKeyEvent(keyEvent);
            break;

        case OpenWnnEvent.INPUT_SOFT_KEY:
            ret = processKeyEvent(keyEvent);
            if (!ret) {
                mInputConnection.sendKeyEvent(keyEvent);
                mInputConnection.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, keyEvent.getKeyCode()));
                ret = true;
            }
            break;

        case OpenWnnEvent.SELECT_CANDIDATE:
            initCommitInfoForWatchCursor();
            if (isEnglishPrediction()) {
                mComposingText.clear();
            }
            mStatus = commitText(ev.word);
            if (isEnglishPrediction() && !mEngineState.isSymbolList() && mEnableAutoInsertSpace) {
                commitSpaceJustOne();
            }
            checkCommitInfo();

            if (mEngineState.isSymbolList()) {
                mEnableAutoDeleteSpace = false;
            }
            break;

        case OpenWnnEvent.CONVERT:           
            startConvert(EngineState.CONVERT_TYPE_RENBUN);
            break;

        case OpenWnnEvent.COMMIT_COMPOSING_TEXT:
            commitAllText();
            break;
        }

        return ret;
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onEvaluateFullscreenMode */
    @Override public boolean onEvaluateFullscreenMode() {
        /* never use full-screen mode */
        return false;
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onEvaluateInputViewShown */
    @Override public boolean onEvaluateInputViewShown() {
        return true;
    }

    /**
     * Get the instance of this service.
     * <br>
     * Before using this method, the constructor of this service must be invoked.
     *
     * @return      The instance of this service
     */
    public static OpenWnnJAJP getInstance() {
        return mSelf;
    }

    /**
     * Create a {@link StrSegment} from a character code.
     * <br>
     * @param charCode           A character code
     * @return                  {@link StrSegment} created; {@code null} if an error occurs.
     */
    private StrSegment createStrSegment(int charCode) {
        if (charCode == 0) {
            return null;
        }
        return new StrSegment(Character.toChars(charCode));
    }

    /**
     * Key event handler.
     *
     * @param ev        A key event
     * @return  {@code true} if the event is handled in this method.
     */
    private boolean processKeyEvent(KeyEvent ev) {
        int key = ev.getKeyCode();

        /* keys which produce a glyph */
        if (ev.isPrintingKey()) {
            /* do nothing if the character is not able to display or the character is dead key */
            if ((mHardShift > 0 && mHardAlt > 0) ||
                (ev.isAltPressed() == true && ev.isShiftPressed() == true)) {
                int charCode = ev.getUnicodeChar(MetaKeyKeyListener.META_SHIFT_ON | MetaKeyKeyListener.META_ALT_ON);
                if (charCode == 0 || (charCode & KeyCharacterMap.COMBINING_ACCENT) != 0 || charCode == PRIVATE_AREA_CODE) {
                    if(mHardShift == 1){
                        mShiftPressing = false;
                    }
                    if(mHardAlt == 1){
                        mAltPressing   = false;
                    }
                    if(!ev.isAltPressed()){
                        if (mHardAlt == 1) {
                            mHardAlt = 0;
                        }
                    }
                    if(!ev.isShiftPressed()){
                        if (mHardShift == 1) {
                            mHardShift = 0;
                        }
                    }
                    if(!ev.isShiftPressed() && !ev.isAltPressed()){
                        updateMetaKeyStateDisplay();
                    }
                    return true;
                }
            }

            commitConvertingText();

            EditorInfo edit = getCurrentInputEditorInfo();
            StrSegment str;

            /* get the key character */
            if (mHardShift== 0 && mHardAlt == 0) {
                /* no meta key is locked */
                int shift = (mAutoCaps)? getShiftKeyState(edit) : 0;
                if (shift != mHardShift && (key >= KeyEvent.KEYCODE_A && key <= KeyEvent.KEYCODE_Z)) {
                    /* handling auto caps for a alphabet character */
                    str = createStrSegment(ev.getUnicodeChar(MetaKeyKeyListener.META_SHIFT_ON));
                } else {
                    str = createStrSegment(ev.getUnicodeChar());
                }
            } else {
                str = createStrSegment(ev.getUnicodeChar(mShiftKeyToggle[mHardShift]
                                                         | mAltKeyToggle[mHardAlt]));
                if(mHardShift == 1){
                    mShiftPressing = false;
                }
                if(mHardAlt == 1){
                    mAltPressing   = false;
                }
                /* back to 0 (off) if 1 (on/not locked) */
                if (!ev.isAltPressed()) {
                    if (mHardAlt == 1) {
                        mHardAlt = 0;
                    }
                }
                if (!ev.isShiftPressed()) {
                    if (mHardShift == 1) {
                        mHardShift = 0;
                    }
                }
                if (!ev.isShiftPressed() && !ev.isShiftPressed()) {
                    updateMetaKeyStateDisplay();
                }
            }
            
            if (str == null) {
                return true;
            }

            /* append the character to the composing text if the character is not TAB */
            if (str.string.charAt(0) != '\u0009') {
                processHardwareKeyboardInputChar(str);
                return true;
            } else {
                commitText(true);
                commitText(str.string);
                initializeScreen();
                return true;
            }

        } else if (key == KeyEvent.KEYCODE_SPACE) {
            /* H/W space key */
            processHardwareKeyboardSpaceKey(ev);
            return true;

        } else if (key == KeyEvent.KEYCODE_SYM) {
            /* display the symbol list */
            initCommitInfoForWatchCursor();
            mStatus = commitText(true);
            checkCommitInfo();
            changeEngineMode(ENGINE_MODE_SYMBOL);
            mHardAlt = 0;
            updateMetaKeyStateDisplay();
            return true;
        }

        /* Functional key */
        if (mComposingText.size(ComposingText.LAYER1) > 0) {
            switch (key) {
            case KeyEvent.KEYCODE_DEL:
                mStatus = STATUS_INPUT_EDIT;
                if (mEngineState.isConvertState()) {
                    mComposingText.setCursor(ComposingText.LAYER1,
                                             mComposingText.toString(ComposingText.LAYER1).length());
                    mExactMatchMode = false;
                } else {
                    if (mComposingText.size(ComposingText.LAYER1) == 1) {
                        initializeScreen();
                        return true;
                    } else {
                        mComposingText.delete(ComposingText.LAYER1, false);
                    }
                }
                updateViewStatusForPrediction(true, true);
                return true;

            case KeyEvent.KEYCODE_BACK:
                if (mCandidatesViewManager.getViewType() == CandidatesViewManager.VIEW_TYPE_FULL) {
                    mStatus &= ~STATUS_CANDIDATE_FULL;
                    mCandidatesViewManager.setViewType(CandidatesViewManager.VIEW_TYPE_NORMAL);
                } else {
                    if (!mEngineState.isConvertState()) {
                        initializeScreen();
                        if (mConverter != null) {
                            mConverter.init();
                        }
                    } else {
                        mCandidatesViewManager.clearCandidates();
                        mStatus = STATUS_INPUT_EDIT;
                        mExactMatchMode = false;
                        mComposingText.setCursor(ComposingText.LAYER1,
                                                 mComposingText.toString(ComposingText.LAYER1).length());
                        updateViewStatusForPrediction(true, true);
                    }
                }
                return true;

            case KeyEvent.KEYCODE_DPAD_LEFT:
                if (!isEnableL2Converter()) {
                    commitText(false);
                    return false;
                } else {
                    processLeftKeyEvent();
                    return true;
                }

            case KeyEvent.KEYCODE_DPAD_RIGHT:
                if (!isEnableL2Converter()) {
                    if (mEngineState.keyboard == EngineState.KEYBOARD_12KEY) {
                        commitText(false);
                    }
                } else {
                    processRightKeyEvent();
                }
                return true;

            case KeyEvent.KEYCODE_DPAD_CENTER:
            case KeyEvent.KEYCODE_ENTER:
                if (!isEnglishPrediction()) {
                    int cursor = mComposingText.getCursor(ComposingText.LAYER1);
                    if (cursor < 1) {
                        return true;
                    }
                }
                initCommitInfoForWatchCursor();
                mStatus = commitText(true);
                checkCommitInfo();

                if (isEnglishPrediction()) {
                    initializeScreen();
                }

                if (mEnableAutoHideKeyboard) {
                    mInputViewManager.closing();
                    requestHideSelf(0);
                }
                return true;

            case KeyEvent.KEYCODE_CALL:
                return false;

            default:
                return true;
            }
        } else {
            /* if there is no composing string. */
            if (mCandidatesViewManager.getCurrentView().isShown()) {
                /* displaying relational prediction candidates */
                switch (key) {
                case KeyEvent.KEYCODE_DPAD_LEFT:
                    if (isEnableL2Converter()) {
                        /* initialize the converter */
                        mConverter.init();
                    }
                    mStatus = STATUS_INPUT_EDIT;
                    updateViewStatusForPrediction(true, true);
                    return false;

                case KeyEvent.KEYCODE_DPAD_RIGHT:
                    if (isEnableL2Converter()) {
                        /* initialize the converter */
                        mConverter.init();
                    }
                    mStatus = STATUS_INPUT_EDIT;
                    updateViewStatusForPrediction(true, true);
                    return false;

                default:
                    return processKeyEventNoInputCandidateShown(ev);
                }
            } else {
                switch (key) {
                case KeyEvent.KEYCODE_DPAD_CENTER:
                case KeyEvent.KEYCODE_ENTER:
                    if (mEnableAutoHideKeyboard) {
                        mInputViewManager.closing();
                        requestHideSelf(0);
                        return true;
                    }
                    break;
                case KeyEvent.KEYCODE_BACK:
                    /*
                     * If 'BACK' key is pressed when the SW-keyboard is shown
                     * and the candidates view is not shown, dismiss the SW-keyboard.
                     */
                    if (isInputViewShown()) {
                        mInputViewManager.closing();
                        requestHideSelf(0);
                        return true;
                    }
                    break;
                default:
                    break;
                }
            }
        }

        return false;
    }

    /**
     * Handle the space key event from the Hardware keyboard.
     * 
     * @param ev  The space key event
     */
    private void processHardwareKeyboardSpaceKey(KeyEvent ev) {
        /* H/W space key */
        if (ev.isShiftPressed()) {
            /* change Japanese <-> English mode */
            mHardAlt = 0;
            mHardShift = 0;
            updateMetaKeyStateDisplay();
            if (mEngineState.isEnglish()) {
                /* English mode to Japanese mode */
                ((DefaultSoftKeyboardJAJP) mInputViewManager).changeKeyMode(DefaultSoftKeyboard.KEYMODE_JA_FULL_HIRAGANA);
                mConverter = mConverterJAJP;
            } else {
                /* Japanese mode to English mode */
                ((DefaultSoftKeyboardJAJP) mInputViewManager).changeKeyMode(DefaultSoftKeyboard.KEYMODE_JA_HALF_ALPHABET);
                mConverter = mConverterEN;
            }
            mCandidatesViewManager.clearCandidates();

        } else if(ev.isAltPressed()){
            /* display the symbol list (G1 specific. same as KEYCODE_SYM) */
            if (!mEngineState.isSymbolList()) {
                commitAllText();
            }
            changeEngineMode(ENGINE_MODE_SYMBOL);
            mHardAlt = 0;
            updateMetaKeyStateDisplay();

        } else if (isEnglishPrediction()) {
            /* Auto commit if English mode */
            if (mComposingText.size(0) == 0) {
                commitText(" ");
                mCandidatesViewManager.clearCandidates();
                breakSequence();
            } else {
                initCommitInfoForWatchCursor();
                commitText(true);
                commitSpaceJustOne();
                checkCommitInfo();
            }
            mEnableAutoDeleteSpace = false;

        } else {
            /* start consecutive clause conversion if Japanese mode */
            if (mComposingText.size(0) == 0) {
                commitText(" ");
                mCandidatesViewManager.clearCandidates();
                breakSequence();
            } else {
                startConvert(EngineState.CONVERT_TYPE_RENBUN);
            }
        }
    }

    /**
     * Handle the character code from the hardware keyboard except the space key.
     *
     * @param str  The input character
     */
    private void processHardwareKeyboardInputChar(StrSegment str) {
        if (isEnableL2Converter()) {
            boolean commit = false;
            if (mPreConverter == null) {
                Matcher m = mEnglishAutoCommitDelimiter.matcher(str.string);
                if (m.matches()) {
                    commitText(true);
                    
                    commit = true;
                }
                appendStrSegment(str);
            } else {
                appendStrSegment(str);
                mPreConverter.convert(mComposingText);
            }
            
            if (commit) {
                commitText(true);
            } else {
                mStatus = STATUS_INPUT;
                updateViewStatusForPrediction(true, true);
            }
        } else {
            appendStrSegment(str);
            boolean completed = true;
            if (mPreConverter != null) {
                completed = mPreConverter.convert(mComposingText);
            }

            if (completed) {
                commitText(false);
            } else {
                updateViewStatus(ComposingText.LAYER1, false, true);
            }
        }
    }

    /** Thread for updating the candidates view */
    private void updatePrediction() {
        int candidates = 0;
        int cursor = mComposingText.getCursor(ComposingText.LAYER1);
        if (isEnableL2Converter() || mEngineState.isSymbolList()) {
            if (mExactMatchMode) {
                /* exact matching */
                candidates = mConverter.predict(mComposingText, 0, cursor);
            } else {
                /* normal prediction */
                candidates = mConverter.predict(mComposingText, 0, -1);
            }
        }

        /* update the candidates view */
        if (candidates > 0) {
            mHasContinuedPrediction = ((mComposingText.size(ComposingText.LAYER1) == 0)
                                       && !mEngineState.isSymbolList());
            mCandidatesViewManager.displayCandidates(mConverter);
        } else {
            mCandidatesViewManager.clearCandidates();
        }
    }

    /**
     * Handle a left key event.
     */
    private void processLeftKeyEvent() {
        if (mEngineState.isConvertState()) {
            if (mEngineState.isEisuKana()) {
                mExactMatchMode = true;
            }

            if (1 < mComposingText.getCursor(ComposingText.LAYER1)) {
                mComposingText.moveCursor(ComposingText.LAYER1, -1);
            }
        } else if (mExactMatchMode) {
            mComposingText.moveCursor(ComposingText.LAYER1, -1);
        } else {
            if (isEnglishPrediction()) {
                mComposingText.moveCursor(ComposingText.LAYER1, -1);
            } else {
                mExactMatchMode = true;
            }
        }

        mCommitCount = 0; /* retry consecutive clause conversion if necessary. */
        mStatus = STATUS_INPUT_EDIT;
        updateViewStatus(mTargetLayer, true, true);
    }

    /**
     * Handle a right key event.
     */
    private void processRightKeyEvent() {
        int layer = mTargetLayer;
        ComposingText composingText = mComposingText;
        if (mExactMatchMode || (mEngineState.isConvertState())) {
            int textSize = composingText.size(ComposingText.LAYER1);
            if (composingText.getCursor(ComposingText.LAYER1) == textSize) {
                mExactMatchMode = false;
                layer = ComposingText.LAYER1; /* convert -> prediction */
                EngineState state = new EngineState();
                state.convertType = EngineState.CONVERT_TYPE_NONE;
                updateEngineState(state);
            } else {
                if (mEngineState.isEisuKana()) {
                    mExactMatchMode = true;
                }
                composingText.moveCursor(ComposingText.LAYER1, 1);
            }
        } else {
            if (composingText.getCursor(ComposingText.LAYER1)
                    < composingText.size(ComposingText.LAYER1)) {
                composingText.moveCursor(ComposingText.LAYER1, 1);
            }
        }

        mCommitCount = 0; /* retry consecutive clause conversion if necessary. */
        mStatus = STATUS_INPUT_EDIT;

        updateViewStatus(layer, true, true);
    }

    /**
     * Handle a key event which is not right or left key when the
     * composing text is empty and some candidates are shown.
     *
     * @param ev        A key event
     * @return          {@code true} if this consumes the event; {@code false} if not.
     */
    boolean processKeyEventNoInputCandidateShown(KeyEvent ev) {
        boolean ret = true;

        switch (ev.getKeyCode()) {
        case KeyEvent.KEYCODE_DEL:
            ret = true;
            break;
        case KeyEvent.KEYCODE_ENTER:
        case KeyEvent.KEYCODE_DPAD_UP:
        case KeyEvent.KEYCODE_DPAD_DOWN:
        case KeyEvent.KEYCODE_MENU:
            ret = false;
            break;
            
        case KeyEvent.KEYCODE_CALL:
            return false;
            
        case KeyEvent.KEYCODE_DPAD_CENTER:
            ret = true;
            break;

        case KeyEvent.KEYCODE_BACK:
            if (mCandidatesViewManager.getViewType() == CandidatesViewManager.VIEW_TYPE_FULL) {
                mStatus &= ~STATUS_CANDIDATE_FULL;
                mCandidatesViewManager.setViewType(CandidatesViewManager.VIEW_TYPE_NORMAL);
                return true;
            } else {
                ret = true;
            }
            break;
        
        default:
            return true;
        }

        if (mConverter != null) {
            /* initialize the converter */
            mConverter.init();
        }
        updateViewStatusForPrediction(true, true);
        return ret;
    }

    /**
     * Update views and the display of the composing text for predict mode.
     *
     * @param updateCandidates  {@code true} to update the candidates view
     * @param updateEmptyText   {@code false} to update the composing text if it is not empty; {@code true} to update always.
     */
    private void updateViewStatusForPrediction(boolean updateCandidates, boolean updateEmptyText) {
        EngineState state = new EngineState();
        state.convertType = EngineState.CONVERT_TYPE_NONE;
        updateEngineState(state);

        updateViewStatus(ComposingText.LAYER1, updateCandidates, updateEmptyText);
    }

    /**
     * Update views and the display of the composing text.
     *
     * @param layer                      Display layer of the composing text
     * @param updateCandidates  {@code true} to update the candidates view
     * @param updateEmptyText   {@code false} to update the composing text if it is not empty; {@code true} to update always.
     */
    private void updateViewStatus(int layer, boolean updateCandidates, boolean updateEmptyText) {
        mTargetLayer = layer;

        if (updateCandidates) {
            updateCandidateView();
        }
        /* notice to the input view */
        mInputViewManager.onUpdateState(this);

        /* set the text for displaying as the composing text */
        mDisplayText.clear();
        mDisplayText.insert(0, mComposingText.toString(layer));

        /* add decoration to the text */
        int cursor = mComposingText.getCursor(layer);
        if ((mInputConnection != null) && (mDisplayText.length() != 0 || updateEmptyText)) {
            if (cursor != 0) {
                int highlightEnd = 0;

                if ((mExactMatchMode && (!mEngineState.isEisuKana()))
                    || (FIX_CURSOR_TEXT_END && isEnglishPrediction()
                        && (cursor < mComposingText.size(ComposingText.LAYER1)))){

                    mDisplayText.setSpan(SPAN_EXACT_BGCOLOR_HL, 0, cursor,
                                         Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                    highlightEnd = cursor;

                } else if (FIX_CURSOR_TEXT_END && mEngineState.isEisuKana()) {
                    mDisplayText.setSpan(SPAN_EISUKANA_BGCOLOR_HL, 0, cursor,
                                         Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                    highlightEnd = cursor;

                } else if (layer == ComposingText.LAYER2) {
                    highlightEnd = mComposingText.toString(layer, 0, 0).length();

                    /* highlights the first segment */
                    mDisplayText.setSpan(SPAN_CONVERT_BGCOLOR_HL, 0,
                                         highlightEnd,
                                         Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                }

                if (FIX_CURSOR_TEXT_END && (highlightEnd != 0)) {
                    /* highlights remaining text */
                    mDisplayText.setSpan(SPAN_REMAIN_BGCOLOR_HL, highlightEnd,
                                         mComposingText.toString(layer).length(),
                                         Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

                    /* text color in the highlight */
                    mDisplayText.setSpan(SPAN_TEXTCOLOR, 0,
                                         mComposingText.toString(layer).length(),
                                         Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); 
                }
            }

            mDisplayText.setSpan(SPAN_UNDERLINE, 0, mDisplayText.length(),
                                 Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

            int displayCursor = mComposingText.toString(layer, 0, cursor - 1).length();
            if (FIX_CURSOR_TEXT_END) {
                displayCursor = (cursor == 0) ?  0 : 1;
            } 
            /* update the composing text on the EditView */
            mInputConnection.setComposingText(mDisplayText, displayCursor);
        }
    }

    /**
     * Update the candidates view.
     */
    private void updateCandidateView() {
        switch (mTargetLayer) {
        case ComposingText.LAYER0:
        case ComposingText.LAYER1: /* prediction */
            if (mEnablePrediction || mEngineState.isSymbolList() || mEngineState.isEisuKana()) {
                /* update the candidates view */
                if ((mComposingText.size(ComposingText.LAYER1) != 0)
                    && !mEngineState.isConvertState()) {
                    
                    mHandler.removeMessages(MSG_PREDICTION);
                    if (mCandidatesViewManager.getCurrentView().isShown()) {
                        mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_PREDICTION),
                                                    PREDICTION_DELAY_MS_SHOWING_CANDIDATE);
                    } else {
                        mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_PREDICTION),
                                                    PREDICTION_DELAY_MS_1ST);
                    }
                } else {
                    mHandler.removeMessages(MSG_PREDICTION);
                    updatePrediction();
                }
            } else {
                mHandler.removeMessages(MSG_PREDICTION);
                mCandidatesViewManager.clearCandidates();
            }
            break;
        case ComposingText.LAYER2: /* convert */
            if (mCommitCount == 0) {
                mHandler.removeMessages(MSG_PREDICTION);
                mConverter.convert(mComposingText);
            }

            int candidates = mConverter.makeCandidateListOf(mCommitCount);

            if (candidates != 0) {
                mComposingText.setCursor(ComposingText.LAYER2, 1);
                mCandidatesViewManager.displayCandidates(mConverter);
            } else {
                mComposingText.setCursor(ComposingText.LAYER1,
                                         mComposingText.toString(ComposingText.LAYER1).length());
                mCandidatesViewManager.clearCandidates();
            }
            break;
        default:
            break;
        }
    }

    /**
     * Commit the displaying composing text.
     *
     * @param learn  {@code true} to register the committed string to the learning dictionary.
     * @return          IME's status after commit
     */
    private int commitText(boolean learn) {
        if (isEnglishPrediction()) {
            mComposingText.setCursor(ComposingText.LAYER1,
                                     mComposingText.size(ComposingText.LAYER1));
        }

        int layer = mTargetLayer;
        int cursor = mComposingText.getCursor(layer);
        if (cursor == 0) {
            return mStatus;
        }
        String tmp = mComposingText.toString(layer, 0, cursor - 1);

        if (mConverter != null) {
            if (learn) {
                if (mEngineState.isRenbun()) {
                    learnWord(0); /* select the top of the clauses */
                } else {
                    if (mComposingText.size(ComposingText.LAYER1) != 0) {
                        String stroke = mComposingText.toString(ComposingText.LAYER1, 0, mComposingText.getCursor(layer) - 1);
                        WnnWord word = new WnnWord(tmp, stroke);
                                                   
                        learnWord(word);
                    }
                }
            } else {
                breakSequence();
            }
        }
        return commitTextThroughInputConnection(tmp);
    }

    /**
     * Commit all uncommitted words.
     */
    private void commitAllText() {
        initCommitInfoForWatchCursor();
        if (mEngineState.isConvertState()) {
            commitConvertingText();
        } else {
            mComposingText.setCursor(ComposingText.LAYER1,
                                     mComposingText.size(ComposingText.LAYER1));
            mStatus = commitText(true);
        }
        checkCommitInfo();
    }

    /**
     * Commit a word.
     *
     * @param word              A word to commit
     * @return                  IME's status after commit
     */
    private int commitText(WnnWord word) {
        if (mConverter != null) {
            learnWord(word);
        }
        return commitTextThroughInputConnection(word.candidate);
    }

    /**
     * Commit a string.
     *
     * @param str  A string to commit
     */
    private void commitText(String str) {
        mInputConnection.commitText(str, (FIX_CURSOR_TEXT_END ? 1 : str.length()));
        mPrevCommitText.append(str);
        mPrevCommitCount++;
        mEnableAutoDeleteSpace = true;
        updateViewStatusForPrediction(false, false);
    }

    /**
     * Commit a string through {@link InputConnection}.
     *
     * @param string  A string to commit
     * @return                  IME's status after commit
     */
    private int commitTextThroughInputConnection(String string) {
        int layer = mTargetLayer;

        mInputConnection.commitText(string, (FIX_CURSOR_TEXT_END ? 1 : string.length()));
        mPrevCommitText.append(string);
        mPrevCommitCount++;
        
        int cursor = mComposingText.getCursor(layer);
        if (cursor > 0) {
            mComposingText.deleteStrSegment(layer, 0, mComposingText.getCursor(layer) - 1);
            mComposingText.setCursor(layer, mComposingText.size(layer));
        }
        mExactMatchMode = false;
        mCommitCount++;

        if ((layer == ComposingText.LAYER2) && (mComposingText.size(layer) == 0)) {
            layer = 1; /* for connected prediction */
        }

        boolean commited = autoCommitEnglish();
        mEnableAutoDeleteSpace = true;

        if (layer == ComposingText.LAYER2) {
            EngineState state = new EngineState();
            state.convertType = EngineState.CONVERT_TYPE_RENBUN;
            updateEngineState(state);
            updateViewStatus(layer, !commited, false);
        } else {
            updateViewStatusForPrediction(!commited, false);
        }

        if (mComposingText.size(ComposingText.LAYER0) == 0) {
            return STATUS_INIT;
        } else {
            return STATUS_INPUT_EDIT;
        }
    }

    /**
     * Returns whether it is English prediction mode or not.
     *
     * @return  {@code true} if it is English prediction mode; otherwise, {@code false}.
     */
    private boolean isEnglishPrediction() {
        return (mEngineState.isEnglish() && isEnableL2Converter());
    }

    /**
     * Change the conversion engine and the letter converter(Romaji-to-Kana converter).
     *
     * @param mode  Engine's mode to be changed
     * @see jp.co.omronsoft.openwnn.OpenWnnEvent.Mode
     * @see jp.co.omronsoft.openwnn.JAJP.DefaultSoftKeyboardJAJP
     */
    private void changeEngineMode(int mode) {
        EngineState state = new EngineState();

        switch (mode) {
        case ENGINE_MODE_OPT_TYPE_QWERTY:
            state.keyboard = EngineState.KEYBOARD_QWERTY;
            updateEngineState(state);
            clearCommitInfo();
            return;

        case ENGINE_MODE_OPT_TYPE_12KEY:
            state.keyboard = EngineState.KEYBOARD_12KEY;
            updateEngineState(state);
            clearCommitInfo();
            return;

        case ENGINE_MODE_EISU_KANA:
            if (mEngineState.isEisuKana()) {
                state.temporaryMode = EngineState.TEMPORARY_DICTIONARY_MODE_NONE;
                updateEngineState(state);
                updateViewStatusForPrediction(true, true); /* prediction only */
            } else {
                startConvert(EngineState.CONVERT_TYPE_EISU_KANA);
            }
            return;

        case ENGINE_MODE_SYMBOL:
            if (mEnableSymbolList && !mDirectInputMode) {
                state.temporaryMode = EngineState.TEMPORARY_DICTIONARY_MODE_SYMBOL;
                updateEngineState(state);
                updateViewStatusForPrediction(true, true);
            }
            return;

        default:
            break;
        }

        state = new EngineState();
        state.temporaryMode = EngineState.TEMPORARY_DICTIONARY_MODE_NONE;
        updateEngineState(state);

        state = new EngineState();
        switch (mode) {
        case OpenWnnEvent.Mode.DIRECT:
            /* Full/Half-width number or Full-width alphabet */
            mConverter = null;
            mPreConverter = null;
            break;

        case OpenWnnEvent.Mode.NO_LV1_CONV:
            /* no Romaji-to-Kana conversion (=English prediction mode) */
            state.dictionarySet = EngineState.DICTIONARYSET_EN;
            updateEngineState(state);
            mConverter = mConverterEN;
            mPreConverter = null;
            break;

        case OpenWnnEvent.Mode.NO_LV2_CONV:
            mConverter = null;
            mPreConverter = mPreConverterHiragana;
            break;

        case ENGINE_MODE_FULL_KATAKANA:
            mConverter = null;
            mPreConverter = mPreConverterFullKatakana;
            break;

        case ENGINE_MODE_HALF_KATAKANA:
            mConverter = null;
            mPreConverter = mPreConverterHalfKatakana;
            break;

        default:
            /* HIRAGANA input mode */
            state.dictionarySet = EngineState.DICTIONARYSET_JP;
            updateEngineState(state);
            mConverter = mConverterJAJP;
            mPreConverter = mPreConverterHiragana;
            break;
        }

        mPreConverterBack = mPreConverter;
        mConverterBack = mConverter;
    }

    /**
     * Update the conversion engine's state.
     *
     * @param state  Engine's state to be updated
     */
    private void updateEngineState(EngineState state) {
        EngineState myState = mEngineState;

        /* language */
        if ((state.dictionarySet != EngineState.INVALID) 
            && (myState.dictionarySet != state.dictionarySet)) {

            switch (state.dictionarySet) {
            case EngineState.DICTIONARYSET_EN:
                setDictionary(OpenWnnEngineJAJP.DIC_LANG_EN);
                break;

            case EngineState.DICTIONARYSET_JP:
            default:
                setDictionary(OpenWnnEngineJAJP.DIC_LANG_JP);
                break;
            }
            myState.dictionarySet = state.dictionarySet;
            breakSequence();

            /* update keyboard setting */
            if (state.keyboard == EngineState.INVALID) {
                state.keyboard = myState.keyboard;
            }
        }

        /* type of conversion */
        if ((state.convertType != EngineState.INVALID)
            && (myState.convertType != state.convertType)) {

            switch (state.convertType) {
            case EngineState.CONVERT_TYPE_NONE:
                setDictionary(mPrevDictionarySet);
                break;

            case EngineState.CONVERT_TYPE_EISU_KANA:
                setDictionary(OpenWnnEngineJAJP.DIC_LANG_JP_EISUKANA);
                break;

            case EngineState.CONVERT_TYPE_RENBUN:
            default:
                setDictionary(OpenWnnEngineJAJP.DIC_LANG_JP);
                break;
            }
            myState.convertType = state.convertType;
        }

        /* temporary dictionary */
        if (state.temporaryMode != EngineState.INVALID) {

            switch (state.temporaryMode) {
            case EngineState.TEMPORARY_DICTIONARY_MODE_NONE:
                if (myState.temporaryMode != EngineState.TEMPORARY_DICTIONARY_MODE_NONE) {
                    setDictionary(mPrevDictionarySet);
                    mCurrentSymbol = 0;
                    mPreConverter = mPreConverterBack;
                    mConverter = mConverterBack;
                    mDisableAutoCommitEnglishMask &= ~AUTO_COMMIT_ENGLISH_SYMBOL;
                }
                break;

            case EngineState.TEMPORARY_DICTIONARY_MODE_SYMBOL:
                if (++mCurrentSymbol >= SYMBOL_LISTS.length) {
                    mCurrentSymbol = 0;
                }
                if (mEnableSymbolListNonHalf) {
                    mConverterSymbolEngineBack.setDictionary(SYMBOL_LISTS[mCurrentSymbol]);
                } else {
                    mConverterSymbolEngineBack.setDictionary(SymbolList.SYMBOL_ENGLISH);
                }
                mConverter = mConverterSymbolEngineBack;
                mDisableAutoCommitEnglishMask |= AUTO_COMMIT_ENGLISH_SYMBOL;
                breakSequence();
                break;

            default:
                break;
            }
            myState.temporaryMode = state.temporaryMode;
        }

        /* preference dictionary */
        if ((state.preferenceDictionary != EngineState.INVALID) 
            && (myState.preferenceDictionary != state.preferenceDictionary)) {

            myState.preferenceDictionary = state.preferenceDictionary;
            setDictionary(mPrevDictionarySet);
        }

        /* keyboard type */
        if (state.keyboard != EngineState.INVALID) {
            switch (state.keyboard) {
            case EngineState.KEYBOARD_12KEY:
                mConverterJAJP.setKeyboardType(OpenWnnEngineJAJP.KEYBOARD_KEYPAD12);
                mConverterEN.setDictionary(OpenWnnEngineEN.DICT_DEFAULT);
                break;
                
            case EngineState.KEYBOARD_QWERTY:
            default:
                mConverterJAJP.setKeyboardType(OpenWnnEngineJAJP.KEYBOARD_QWERTY);
                if (mEnableSpellCorrection) {
                    mConverterEN.setDictionary(OpenWnnEngineEN.DICT_FOR_CORRECT_MISTYPE);
                } else {
                    mConverterEN.setDictionary(OpenWnnEngineEN.DICT_DEFAULT);
                }
                break;
            }
            myState.keyboard = state.keyboard;
        }
    }

    /**
     * Set dictionaries to be used.
     * 
     * @param mode  Definition of dictionaries
     */
    private void setDictionary(int mode) {
        int target = mode;
        switch (target) {

        case OpenWnnEngineJAJP.DIC_LANG_JP:

            switch (mEngineState.preferenceDictionary) {
            case EngineState.PREFERENCE_DICTIONARY_PERSON_NAME:
                target = OpenWnnEngineJAJP.DIC_LANG_JP_PERSON_NAME;
                break;
            case EngineState.PREFERENCE_DICTIONARY_POSTAL_ADDRESS:
                target = OpenWnnEngineJAJP.DIC_LANG_JP_POSTAL_ADDRESS;
                break;
            default:
                break;
            }

            break;

        case OpenWnnEngineJAJP.DIC_LANG_EN:

            switch (mEngineState.preferenceDictionary) {
            case EngineState.PREFERENCE_DICTIONARY_EMAIL_ADDRESS_URI:
                target = OpenWnnEngineJAJP.DIC_LANG_EN_EMAIL_ADDRESS;
                break;
            default:
                break;
            }

            break;

        default:
            break;
        }
 
        switch (mode) {
        case OpenWnnEngineJAJP.DIC_LANG_JP:
        case OpenWnnEngineJAJP.DIC_LANG_EN:
            mPrevDictionarySet = mode;
            break;
        default:
            break;
        }

        mConverterJAJP.setDictionary(target);
    }

    /**
     * Handle a toggle key input event.
     *
     * @param table  Table of toggle characters
     */
    private void processSoftKeyboardToggleChar(String[] table) {
        if (table == null) {
            return;
        }

        commitConvertingText();

        boolean toggled = false;
        if ((mStatus & ~STATUS_CANDIDATE_FULL) == STATUS_INPUT) {
            int cursor = mComposingText.getCursor(ComposingText.LAYER1);
            if (cursor > 0) {
                String prevChar = mComposingText.getStrSegment(ComposingText.LAYER1,
                                                               cursor - 1).string;
                String c = searchToggleCharacter(prevChar, table, false);
                if (c != null) {
                    mComposingText.delete(ComposingText.LAYER1, false);
                    appendStrSegment(new StrSegment(c));
                    toggled = true;
                }
            }
        }

        if (!toggled) {
            if (!isEnableL2Converter()) {
                commitText(false);
            }

            String str = table[0];
            /* shift on */
            if (mAutoCaps
                && isEnglishPrediction()
                && (getShiftKeyState(getCurrentInputEditorInfo()) == 1)) {

                char top = table[0].charAt(0);
                if (Character.isLowerCase(top)) {
                    str = Character.toString(Character.toUpperCase(top));
                }
            } 
            appendStrSegment(new StrSegment(str));
        }

        mStatus = STATUS_INPUT;

        updateViewStatusForPrediction(true, true);
    }

    /**
     * Handle character input from the software keyboard without listing candidates.
     *
     * @param chars  The input character(s)
     */
    private void processSoftKeyboardCodeWithoutConversion(char[] chars) {
        if (chars == null) {
            return;
        }

        ComposingText text = mComposingText;
        appendStrSegment(new StrSegment(chars));

        if (!isAlphabetLast(text.toString(ComposingText.LAYER1))) {
            /* commit if the input character is not alphabet */
            commitText(false);
        } else {
            boolean completed = mPreConverter.convert(text);
            if (completed) {
                commitText(false);
            } else {
                mStatus = STATUS_INPUT;
                updateViewStatusForPrediction(true, true);
            }
        }
    }

    /**
     * Handle character input from the software keyboard.
     *
     * @param chars   The input character(s)
     */
    private void processSoftKeyboardCode(char[] chars) {
        if (chars == null) {
            return;
        }

        if ((chars[0] == ' ') || (chars[0] == '\u3000' /* Full-width space */)) {
            if (mComposingText.size(0) == 0) {
                mCandidatesViewManager.clearCandidates();
                commitText(new String(chars));
                breakSequence();
            } else {
                if (isEnglishPrediction()) {
                    initCommitInfoForWatchCursor();
                    commitText(true);
                    commitSpaceJustOne();
                    checkCommitInfo();
                } else {
                    startConvert(EngineState.CONVERT_TYPE_RENBUN);
                }
            }
            mEnableAutoDeleteSpace = false;
        } else {
            commitConvertingText();

            /* Auto-commit a word if it is English and Qwerty mode */
            boolean commit = false;
            if (isEnglishPrediction()
                && (mEngineState.keyboard == EngineState.KEYBOARD_QWERTY)) {

                Matcher m = mEnglishAutoCommitDelimiter.matcher(new String(chars));
                if (m.matches()) {
                    commit = true;
                }
            }
        
            if (commit) {
                commitText(true);

                appendStrSegment(new StrSegment(chars));
                commitText(true);
            } else {
                appendStrSegment(new StrSegment(chars));
                if (mPreConverter != null) {
                    mPreConverter.convert(mComposingText);
                    mStatus = STATUS_INPUT;
                }
                updateViewStatusForPrediction(true, true);
            }
        }
    }

    /**
     * Start consecutive clause conversion or EISU-KANA conversion mode.
     *
     * @param convertType               The conversion type({@code EngineState.CONVERT_TYPE_*})
     */
    private void startConvert(int convertType) {
        if (!isEnableL2Converter()) {
            return;
        }

        if (mEngineState.convertType != convertType) {
            /* adjust the cursor position */
            if (!mExactMatchMode) {
                if (convertType == EngineState.CONVERT_TYPE_RENBUN) {
                    /* not specify */
                    mComposingText.setCursor(ComposingText.LAYER1, 0);
                } else {
                    if (mEngineState.isRenbun()) {
                        /* EISU-KANA conversion specifying the position of the segment if previous mode is conversion mode */
                        mExactMatchMode = true;
                    } else {
                        /* specify all range */
                        mComposingText.setCursor(ComposingText.LAYER1,
                                                 mComposingText.size(ComposingText.LAYER1));
                    }
                }
            } 

            if (convertType == EngineState.CONVERT_TYPE_RENBUN) {
                /* clears variables for the prediction */
                mExactMatchMode = false;
            }
            /* clears variables for the convert */
            mCommitCount = 0;

            int layer;
            if (convertType == EngineState.CONVERT_TYPE_EISU_KANA) {
                layer = ComposingText.LAYER1;
            } else {
                layer = ComposingText.LAYER2;
            }

            EngineState state = new EngineState();
            state.convertType = convertType;
            updateEngineState(state);

            updateViewStatus(layer, true, true);
        }
    }

    /**
     * Auto commit a word in English (on half-width alphabet mode).
     *
     * @return  {@code true} if auto-committed; otherwise, {@code false}.
     */
    private boolean autoCommitEnglish() {
        if (isEnglishPrediction() && (mDisableAutoCommitEnglishMask == AUTO_COMMIT_ENGLISH_ON)) {
            CharSequence seq = mInputConnection.getTextBeforeCursor(2, 0);
            Matcher m = mEnglishAutoCommitDelimiter.matcher(seq);
            if (m.matches()) {
                if ((seq.charAt(0) == ' ') && mEnableAutoDeleteSpace) {
                    mInputConnection.deleteSurroundingText(2, 0);
                    CharSequence str = seq.subSequence(1, 2);
                    mInputConnection.commitText(str, 1);
                    mPrevCommitText.append(str);
                    mPrevCommitCount++;
                }

                mHandler.removeMessages(MSG_PREDICTION);
                mCandidatesViewManager.clearCandidates();
                return true;
            }
        }
        return false;
    }

    /**
     * Insert a white space if the previous character is not a white space.
     */
    private void commitSpaceJustOne() {
        CharSequence seq = mInputConnection.getTextBeforeCursor(1, 0);
        if (seq.charAt(0) != ' ') {
            commitText(" ");
        }
    }

    /**
     * Get the shift key state from the editor.
     *
     * @param editor    The editor
     * @return          State ID of the shift key (0:off, 1:on)
     */
    protected int getShiftKeyState(EditorInfo editor) {
        return (getCurrentInputConnection().getCursorCapsMode(editor.inputType) == 0) ? 0 : 1;
    }

    /**
     * Display current meta-key state.
     */
    private void updateMetaKeyStateDisplay() {
        int mode = 0;
        if(mHardShift == 0 && mHardAlt == 0){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_OFF_ALT_OFF;
        }else if(mHardShift == 1 && mHardAlt == 0){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_ON_ALT_OFF;
        }else if(mHardShift == 2  && mHardAlt == 0){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_LOCK_ALT_OFF;
        }else if(mHardShift == 0 && mHardAlt == 1){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_OFF_ALT_ON;
        }else if(mHardShift == 0 && mHardAlt == 2){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_OFF_ALT_LOCK;
        }else if(mHardShift == 1 && mHardAlt == 1){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_ON_ALT_ON;
        }else if(mHardShift == 1 && mHardAlt == 2){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_ON_ALT_LOCK;
        }else if(mHardShift == 2 && mHardAlt == 1){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_LOCK_ALT_ON;
        }else if(mHardShift == 2 && mHardAlt == 2){
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_LOCK_ALT_LOCK;
        }else{
            mode = DefaultSoftKeyboard.HARD_KEYMODE_SHIFT_OFF_ALT_OFF;
        }
        ((DefaultSoftKeyboard) mInputViewManager).updateIndicator(mode);
    }

    /**
     * Memory a selected word. 
     * 
     * @param word  A selected word
     */
    private void learnWord(WnnWord word) {
        if (mEnableLearning && word != null) {
            mConverter.learn(word);
        }
    }

    /**
     * Memory a clause which is generated by consecutive clause conversion.
     * 
     * @param index  Index of a clause
     */
    private void learnWord(int index) {
        ComposingText composingText = mComposingText;

        if (mEnableLearning && composingText.size(ComposingText.LAYER2) > index) {
            StrSegment seg = composingText.getStrSegment(ComposingText.LAYER2, index);
            if (seg instanceof StrSegmentClause) {
                mConverter.learn(((StrSegmentClause)seg).clause);
            } else {
                String stroke = composingText.toString(ComposingText.LAYER1, seg.from, seg.to);
                mConverter.learn(new WnnWord(seg.string, stroke));
            }
        }
    }

    /**
     * Fits an editor info.
     * 
     * @param preferences  The preference data.
     * @param info              The editor info.
     */
    private void fitInputType(SharedPreferences preference, EditorInfo info) {
        if (info.inputType == EditorInfo.TYPE_NULL) {
            mDirectInputMode = true;
            return;
        }

        mEnableLearning   = preference.getBoolean("opt_enable_learning", true);
        mEnablePrediction = preference.getBoolean("opt_prediction", true);
        mEnableSpellCorrection = preference.getBoolean("opt_spell_correction", true);
        mDisableAutoCommitEnglishMask &= ~AUTO_COMMIT_ENGLISH_OFF;
        int preferenceDictionary = EngineState.PREFERENCE_DICTIONARY_NONE;
        mEnableConverter = true;
        mEnableSymbolList = true;
        mEnableSymbolListNonHalf = true;
        mAutoCaps = preference.getBoolean("auto_caps", true);
        mFilter.filter = 0;
        mEnableAutoInsertSpace = true;
        mEnableAutoHideKeyboard = false;

        switch (info.inputType & EditorInfo.TYPE_MASK_CLASS) {
        case EditorInfo.TYPE_CLASS_NUMBER:
        case EditorInfo.TYPE_CLASS_DATETIME:
            mEnableConverter = false;
            break;

        case EditorInfo.TYPE_CLASS_PHONE:
            mEnableSymbolList = false;
            mEnableConverter = false;
            break;

        case EditorInfo.TYPE_CLASS_TEXT:

            switch (info.inputType & EditorInfo.TYPE_MASK_VARIATION) {
            case EditorInfo.TYPE_TEXT_VARIATION_PERSON_NAME:
                preferenceDictionary = EngineState.PREFERENCE_DICTIONARY_PERSON_NAME;
                break;
                
            case EditorInfo.TYPE_TEXT_VARIATION_PASSWORD:
                mEnableLearning = false;
                mEnableConverter = false;
                mEnableSymbolListNonHalf = false;
                mFilter.filter = CandidateFilter.FILTER_NON_ASCII; 
                mDisableAutoCommitEnglishMask |= AUTO_COMMIT_ENGLISH_OFF;
                mEnableAutoHideKeyboard = true;
                break;

            case EditorInfo.TYPE_TEXT_VARIATION_EMAIL_ADDRESS:
                mFilter.filter = CandidateFilter.FILTER_NON_ASCII; 
                mEnableSymbolListNonHalf = false;
                mEnableAutoInsertSpace = false;
                mDisableAutoCommitEnglishMask |= AUTO_COMMIT_ENGLISH_OFF;
                preferenceDictionary = EngineState.PREFERENCE_DICTIONARY_EMAIL_ADDRESS_URI;
                break;

            case EditorInfo.TYPE_TEXT_VARIATION_URI:
                mEnableAutoInsertSpace = false;
                mDisableAutoCommitEnglishMask |= AUTO_COMMIT_ENGLISH_OFF;
                preferenceDictionary = EngineState.PREFERENCE_DICTIONARY_EMAIL_ADDRESS_URI;
                break;

            case EditorInfo.TYPE_TEXT_VARIATION_POSTAL_ADDRESS:
                preferenceDictionary = EngineState.PREFERENCE_DICTIONARY_POSTAL_ADDRESS;
                break;

            case EditorInfo.TYPE_TEXT_VARIATION_PHONETIC:
                mEnableLearning = false;
                mEnableConverter = false;
                mEnableSymbolList = false;
                break;

            default:
                break;
            }
            break;

        default:
            break;
        }

        if (mFilter.filter == 0) {
            mConverterEN.setFilter(null);
            mConverterJAJP.setFilter(null);
        } else {
            mConverterEN.setFilter(mFilter);
            mConverterJAJP.setFilter(mFilter);
        }

        EngineState state = new EngineState();
        state.preferenceDictionary = preferenceDictionary;
        state.convertType = EngineState.CONVERT_TYPE_NONE;
        state.keyboard = mEngineState.keyboard;
        updateEngineState(state);
        updateMetaKeyStateDisplay();

        checkTutorial(info.privateImeOptions);
    }
    
    /**
     * Append a {@link StrSegment} to the composing text
     * <br>
     * If the length of the composing text exceeds
     * {@code LIMIT_INPUT_NUMBER}, the appending operation is ignored.
     *
     * @param  str  Input segment
     */
    private void appendStrSegment(StrSegment str) {
        ComposingText composingText = mComposingText;
        
        if (composingText.size(ComposingText.LAYER1) >= LIMIT_INPUT_NUMBER) {
            return; /* do nothing */
        }
        composingText.insertStrSegment(ComposingText.LAYER0, ComposingText.LAYER1, str);
        return;
    }

    /**
     * Commit the consecutive clause conversion.
     */
    private void commitConvertingText() {
        if (mEngineState.isConvertState()) {
            int size = mComposingText.size(ComposingText.LAYER2);
            for (int i = 0; i < size; i++) {
                learnWord(i);
            }

            String text = mComposingText.toString(ComposingText.LAYER2);
            mInputConnection.commitText(text, (FIX_CURSOR_TEXT_END ? 1 : text.length()));
            mPrevCommitText.append(text);
            mPrevCommitCount++;
            initializeScreen();
        }
    }
    
    /**
     * Initialize the screen displayed by IME
     */
    private void initializeScreen() {
        if (mComposingText.size(ComposingText.LAYER0) != 0) {
            mInputConnection.setComposingText("", 0);
        }
        mComposingText.clear();
        mExactMatchMode = false;       
        mStatus = STATUS_INIT;
        mHandler.removeMessages(MSG_PREDICTION);
        View candidateView = mCandidatesViewManager.getCurrentView();
        if ((candidateView != null) && candidateView.isShown()) {
            mCandidatesViewManager.clearCandidates();
        }
        mInputViewManager.onUpdateState(this);

        EngineState state = new EngineState();
        state.temporaryMode = EngineState.TEMPORARY_DICTIONARY_MODE_NONE;
        updateEngineState(state);
    }
    
    /**
     * Whether the tail of the string is alphabet or not.
     *
     * @param  str      The string
     * @return          {@code true} if the tail is alphabet; {@code false} if otherwise.
     */
    private boolean isAlphabetLast(String str) {
        Matcher m = ENGLISH_CHARACTER_LAST.matcher(str);
        return m.matches();
    }

    /** @see jp.co.omronsoft.openwnn.OpenWnn#onFinishInput */
    @Override public void onFinishInput() {
        if (mInputConnection != null) {
            initializeScreen();
        }
        super.onFinishInput();
    }

    /**
     * Check whether or not the converter is active.
     * 
     * @return {@code true} if the converter is active.
     */
    private boolean isEnableL2Converter() {
        if (mConverter == null || !mEnableConverter) {
            return false;
        }

        if (mEngineState.isEnglish() && !mEnablePrediction) {
            return false;
        }

        return true;
    }

    /**
     * Handling KeyEvent(KEYUP)
     * <br>
     * This method is called from {@link #onEvent()}.
     *
     * @param ev   An up key event
     */
    private void onKeyUpEvent(KeyEvent ev) {
        int key = ev.getKeyCode();
        if(!mShiftPressing){
            if(key == KeyEvent.KEYCODE_SHIFT_LEFT || key == KeyEvent.KEYCODE_SHIFT_RIGHT){
                mHardShift = 0;
                mShiftPressing = true;
                updateMetaKeyStateDisplay();
            }
        }
        if(!mAltPressing ){
            if(key == KeyEvent.KEYCODE_ALT_LEFT || key == KeyEvent.KEYCODE_ALT_RIGHT){
                mHardAlt = 0;
                mAltPressing   = true;
                updateMetaKeyStateDisplay();
            }
        }
    }

    /**
     * Initialize the committed text's information.
     */
    private void initCommitInfoForWatchCursor() {
        if (!isEnableL2Converter()) {
            return;
        }

        mCommitStartCursor = mComposingStartCursor;
        mPrevCommitText.delete(0, mPrevCommitText.length());
    }
    
    /**
     * Clear the commit text's info.
     * @return {@code true}:cleared, {@code false}:has already cleared.
     */
    private boolean clearCommitInfo() {
        if (mCommitStartCursor < 0) {
            return false;
        }

        mCommitStartCursor = -1;
        return true;
    }

    /**
     * Verify the commit text.
     */
    private void checkCommitInfo() {
        if (mCommitStartCursor < 0) {
            return;
        }

        int composingLength = mComposingText.toString(mTargetLayer).length();
        CharSequence seq = mInputConnection.getTextBeforeCursor(mPrevCommitText.length() + composingLength, 0);
        seq = seq.subSequence(0, seq.length() - composingLength);
        if (!seq.equals(mPrevCommitText.toString())) {
            mPrevCommitCount = 0;
            clearCommitInfo();
        }
    }

    /**
     * Check and start the tutorial if it is the tutorial mode.
     * 
     * @param privateImeOptions IME's options
     */
    private void checkTutorial(String privateImeOptions) {
        if (privateImeOptions == null) return;
        if (privateImeOptions.equals("com.android.setupwizard:ShowTutorial")) {
            if ((mTutorial == null) && mEnableTutorial) startTutorial();
        } else if (privateImeOptions.equals("com.android.setupwizard:HideTutorial")) {
            if (mTutorial != null) {
                if (mTutorial.close()) {
                    mTutorial = null;
                }
            }
        }
    }

    /**
     * Start the tutorial
     */
    private void startTutorial() {
        DefaultSoftKeyboardJAJP manager = (DefaultSoftKeyboardJAJP) mInputViewManager;
        manager.setDefaultKeyboard();
        if (mEngineState.keyboard == EngineState.KEYBOARD_QWERTY) {
            manager.changeKeyboardType(DefaultSoftKeyboard.KEYBOARD_12KEY);
        }

        DefaultSoftKeyboardJAJP inputManager = ((DefaultSoftKeyboardJAJP) mInputViewManager);
        View v = inputManager.getKeyboardView();
        v.setOnTouchListener(new View.OnTouchListener() {
				public boolean onTouch(View v, MotionEvent event) {
					return true;
				}});
        mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_START_TUTORIAL), 500);
    }

    /**
     * Close the tutorial
     */
    public void tutorialDone() {
        mTutorial = null;
    }

    /** @see OpenWnn#close */
    @Override protected void close() {
        mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_CLOSE), 0);
    }

    /**
     * Break the sequence of words.
     */
    private void breakSequence() {
        mEnableAutoDeleteSpace = false;
        mConverterJAJP.breakSequence();
        mConverterEN.breakSequence();
    }
}