| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * 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 com.android.fmradio; |
| |
| import android.content.ContentProvider; |
| import android.content.ContentUris; |
| import android.content.ContentValues; |
| import android.content.Context; |
| import android.content.UriMatcher; |
| import android.database.Cursor; |
| import android.database.sqlite.SQLiteDatabase; |
| import android.database.sqlite.SQLiteOpenHelper; |
| import android.database.sqlite.SQLiteQueryBuilder; |
| import android.net.Uri; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| /** |
| * This class provider interface to operator FM database table StationList |
| */ |
| public class FmProvider extends ContentProvider { |
| private static final String TAG = "FmProvider"; |
| |
| // database instance use to operate the database |
| private SQLiteDatabase mSqlDb = null; |
| // database helper use to get database instance |
| private DatabaseHelper mDbHelper = null; |
| // database name |
| private static final String DATABASE_NAME = "FmRadio.db"; |
| // database version |
| private static final int DATABASE_VERSION = 1; |
| // table name |
| private static final String TABLE_NAME = "StationList"; |
| |
| // URI match code |
| private static final int STATION_FREQ = 1; |
| // URI match code |
| private static final int STATION_FREQ_ID = 2; |
| // use to match URI |
| private static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH); |
| |
| // match URI with station frequency or station frequency id |
| static { |
| URI_MATCHER.addURI(FmStation.AUTHORITY, FmStation.STATION, STATION_FREQ); |
| URI_MATCHER.addURI(FmStation.AUTHORITY, FmStation.STATION + "/#", |
| STATION_FREQ_ID); |
| } |
| |
| /** |
| * Helper to operate database |
| */ |
| private static class DatabaseHelper extends SQLiteOpenHelper { |
| |
| /** |
| * initial database name and database version |
| * |
| * @param context application context |
| */ |
| DatabaseHelper(Context context) { |
| super(context, DATABASE_NAME, null, DATABASE_VERSION); |
| } |
| |
| /** |
| * Create database table |
| * |
| * @param db The database |
| */ |
| @Override |
| public void onCreate(SQLiteDatabase db) { |
| // Create the table |
| Log.d(TAG, "onCreate, create the database"); |
| db.execSQL( |
| "CREATE TABLE " + TABLE_NAME + "(" |
| + FmStation.Station._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," |
| + FmStation.Station.FREQUENCY + " INTEGER UNIQUE," |
| + FmStation.Station.IS_FAVORITE + " INTEGER DEFAULT 0," |
| + FmStation.Station.STATION_NAME + " TEXT," |
| + FmStation.Station.PROGRAM_SERVICE + " TEXT," |
| + FmStation.Station.RADIO_TEXT + " TEXT" |
| + ");" |
| ); |
| } |
| |
| /** |
| * Upgrade database |
| * |
| * @param db database |
| * @param oldVersion The old database version |
| * @param newVersion The new database version |
| */ |
| @Override |
| public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { |
| // TODO: reimplement this when dB version changes |
| Log.i(TAG, "onUpgrade, upgrading database from version " + oldVersion + " to " |
| + newVersion + ", which will destroy all old data"); |
| db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); |
| onCreate(db); |
| } |
| } |
| |
| /** |
| * Delete database table rows with condition |
| * |
| * @param uri The uri to delete |
| * @param selection The where cause to apply, if null will delete all rows |
| * @param selectionArgs The select value |
| * |
| * @return The rows number has be deleted |
| */ |
| @Override |
| public int delete(Uri uri, String selection, String[] selectionArgs) { |
| int rows = 0; |
| mSqlDb = mDbHelper.getWritableDatabase(); |
| switch (URI_MATCHER.match(uri)) { |
| case STATION_FREQ: |
| rows = mSqlDb.delete(TABLE_NAME, selection, selectionArgs); |
| getContext().getContentResolver().notifyChange(uri, null); |
| break; |
| |
| case STATION_FREQ_ID: |
| String stationID = uri.getPathSegments().get(1); |
| rows = mSqlDb.delete(TABLE_NAME, |
| FmStation.Station._ID |
| + "=" |
| + stationID |
| + (TextUtils.isEmpty(selection) ? "" : " AND (" + selection + ")"), |
| selectionArgs); |
| getContext().getContentResolver().notifyChange(uri, null); |
| break; |
| |
| default: |
| Log.e(TAG, "delete, unkown URI to delete: " + uri); |
| break; |
| } |
| return rows; |
| } |
| |
| /** |
| * Insert values to database with uri |
| * |
| * @param uri The insert uri |
| * @param values The insert values |
| * |
| * @return The uri after inserted |
| */ |
| @Override |
| public Uri insert(Uri uri, ContentValues values) { |
| Uri rowUri = null; |
| mSqlDb = mDbHelper.getWritableDatabase(); |
| ContentValues v = new ContentValues(values); |
| |
| long rowId = mSqlDb.insert(TABLE_NAME, null, v); |
| if (rowId <= 0) { |
| Log.e(TAG, "insert, failed to insert row into " + uri); |
| } |
| rowUri = ContentUris.appendId(FmStation.Station.CONTENT_URI.buildUpon(), rowId) |
| .build(); |
| getContext().getContentResolver().notifyChange(rowUri, null); |
| return rowUri; |
| } |
| |
| /** |
| * Create database helper |
| * |
| * @return true if create database helper success |
| */ |
| @Override |
| public boolean onCreate() { |
| mDbHelper = new DatabaseHelper(getContext()); |
| return (null == mDbHelper) ? false : true; |
| } |
| |
| /** |
| * Query the database with current settings and add information |
| * |
| * @param uri The database uri |
| * @param projection The columns need to query |
| * @param selection The where clause |
| * @param selectionArgs The where value |
| * @param sortOrder The column to sort |
| * |
| * @return The query result cursor |
| */ |
| @Override |
| public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, |
| String sortOrder) { |
| SQLiteQueryBuilder qb = new SQLiteQueryBuilder(); |
| SQLiteDatabase db = mDbHelper.getReadableDatabase(); |
| qb.setTables(TABLE_NAME); |
| |
| int match = URI_MATCHER.match(uri); |
| |
| if (STATION_FREQ_ID == match) { |
| qb.appendWhere("_id = " + uri.getPathSegments().get(1)); |
| } |
| |
| Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder); |
| if (null != c) { |
| c.setNotificationUri(getContext().getContentResolver(), uri); |
| } |
| return c; |
| } |
| |
| /** |
| * Update the database content use content values with current settings and |
| * add information |
| * |
| * @param uri The database uri |
| * @param values The values need to update |
| * @param selection The where clause |
| * @param selectionArgs The where value |
| * |
| * @return The row numbers have changed |
| */ |
| @Override |
| public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { |
| int rows = 0; |
| mSqlDb = mDbHelper.getWritableDatabase(); |
| switch (URI_MATCHER.match(uri)) { |
| case STATION_FREQ: |
| rows = mSqlDb.update(TABLE_NAME, values, selection, selectionArgs); |
| getContext().getContentResolver().notifyChange(uri, null); |
| break; |
| case STATION_FREQ_ID: |
| String stationID = uri.getPathSegments().get(1); |
| rows = mSqlDb.update(TABLE_NAME, |
| values, |
| FmStation.Station._ID |
| + "=" |
| + stationID |
| + (TextUtils.isEmpty(selection) ? "" : " AND (" + selection + ")"), |
| selectionArgs); |
| getContext().getContentResolver().notifyChange(uri, null); |
| break; |
| default: |
| Log.e(TAG, "update, unkown URI to update: " + uri); |
| break; |
| } |
| return rows; |
| } |
| |
| /** |
| * Get uri type |
| * |
| * @param uri The the uri |
| * |
| * @return The type |
| */ |
| @Override |
| public String getType(Uri uri) { |
| return null; |
| } |
| } |