| /* |
| * Copyright (C) 2015 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.launcher3.allapps; |
| |
| import android.os.Handler; |
| |
| import com.android.launcher3.AppInfo; |
| import com.android.launcher3.util.ComponentKey; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * The default search implementation. |
| */ |
| public class DefaultAppSearchAlgorithm { |
| |
| private final List<AppInfo> mApps; |
| protected final Handler mResultHandler; |
| |
| public DefaultAppSearchAlgorithm(List<AppInfo> apps) { |
| mApps = apps; |
| mResultHandler = new Handler(); |
| } |
| |
| public void cancel(boolean interruptActiveRequests) { |
| if (interruptActiveRequests) { |
| mResultHandler.removeCallbacksAndMessages(null); |
| } |
| } |
| |
| public void doSearch(final String query, |
| final AllAppsSearchBarController.Callbacks callback) { |
| final ArrayList<ComponentKey> result = getTitleMatchResult(query); |
| mResultHandler.post(new Runnable() { |
| |
| @Override |
| public void run() { |
| callback.onSearchResult(query, result); |
| } |
| }); |
| } |
| |
| protected ArrayList<ComponentKey> getTitleMatchResult(String query) { |
| // Do an intersection of the words in the query and each title, and filter out all the |
| // apps that don't match all of the words in the query. |
| final String queryTextLower = query.toLowerCase(); |
| final ArrayList<ComponentKey> result = new ArrayList<>(); |
| for (AppInfo info : mApps) { |
| if (matches(info, queryTextLower)) { |
| result.add(info.toComponentKey()); |
| } |
| } |
| return result; |
| } |
| |
| protected boolean matches(AppInfo info, String query) { |
| int queryLength = query.length(); |
| |
| String title = info.title.toString(); |
| int titleLength = title.length(); |
| |
| if (titleLength < queryLength || queryLength <= 0) { |
| return false; |
| } |
| |
| int lastType; |
| int thisType = Character.UNASSIGNED; |
| int nextType = Character.getType(title.codePointAt(0)); |
| |
| int end = titleLength - queryLength; |
| for (int i = 0; i <= end; i++) { |
| lastType = thisType; |
| thisType = nextType; |
| nextType = i < (titleLength - 1) ? |
| Character.getType(title.codePointAt(i + 1)) : Character.UNASSIGNED; |
| if (isBreak(thisType, lastType, nextType) && |
| title.substring(i, i + queryLength).equalsIgnoreCase(query)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Returns true if the current point should be a break point. Following cases |
| * are considered as break points: |
| * 1) Any non space character after a space character |
| * 2) Any digit after a non-digit character |
| * 3) Any capital character after a digit or small character |
| * 4) Any capital character before a small character |
| */ |
| protected boolean isBreak(int thisType, int prevType, int nextType) { |
| switch (thisType) { |
| case Character.UPPERCASE_LETTER: |
| if (nextType == Character.UPPERCASE_LETTER) { |
| return true; |
| } |
| // Follow through |
| case Character.TITLECASE_LETTER: |
| // Break point if previous was not a upper case |
| return prevType != Character.UPPERCASE_LETTER; |
| case Character.LOWERCASE_LETTER: |
| // Break point if previous was not a letter. |
| return prevType > Character.OTHER_LETTER || prevType <= Character.UNASSIGNED; |
| case Character.DECIMAL_DIGIT_NUMBER: |
| case Character.LETTER_NUMBER: |
| case Character.OTHER_NUMBER: |
| // Break point if previous was not a number |
| return !(prevType == Character.DECIMAL_DIGIT_NUMBER |
| || prevType == Character.LETTER_NUMBER |
| || prevType == Character.OTHER_NUMBER); |
| case Character.MATH_SYMBOL: |
| case Character.CURRENCY_SYMBOL: |
| case Character.OTHER_PUNCTUATION: |
| case Character.DASH_PUNCTUATION: |
| // Always a break point for a symbol |
| return true; |
| default: |
| // Always a break point at first character |
| return prevType == Character.UNASSIGNED; |
| } |
| } |
| } |