1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.launcher3.allapps; 17 18 import android.os.Handler; 19 20 import com.android.launcher3.AppInfo; 21 import com.android.launcher3.util.ComponentKey; 22 23 import java.util.ArrayList; 24 import java.util.List; 25 import java.util.regex.Pattern; 26 27 /** 28 * The default search implementation. 29 */ 30 public class DefaultAppSearchAlgorithm { 31 32 private static final Pattern SPLIT_PATTERN = Pattern.compile("[\\s|\\p{javaSpaceChar}]+"); 33 34 private final List<AppInfo> mApps; 35 protected final Handler mResultHandler; 36 DefaultAppSearchAlgorithm(List<AppInfo> apps)37 public DefaultAppSearchAlgorithm(List<AppInfo> apps) { 38 mApps = apps; 39 mResultHandler = new Handler(); 40 } 41 cancel(boolean interruptActiveRequests)42 public void cancel(boolean interruptActiveRequests) { 43 if (interruptActiveRequests) { 44 mResultHandler.removeCallbacksAndMessages(null); 45 } 46 } 47 doSearch(final String query, final AllAppsSearchBarController.Callbacks callback)48 public void doSearch(final String query, 49 final AllAppsSearchBarController.Callbacks callback) { 50 final ArrayList<ComponentKey> result = getTitleMatchResult(query); 51 mResultHandler.post(new Runnable() { 52 53 @Override 54 public void run() { 55 callback.onSearchResult(query, result); 56 } 57 }); 58 } 59 getTitleMatchResult(String query)60 protected ArrayList<ComponentKey> getTitleMatchResult(String query) { 61 // Do an intersection of the words in the query and each title, and filter out all the 62 // apps that don't match all of the words in the query. 63 final String queryTextLower = query.toLowerCase(); 64 final String[] queryWords = SPLIT_PATTERN.split(queryTextLower); 65 66 final ArrayList<ComponentKey> result = new ArrayList<>(); 67 for (AppInfo info : mApps) { 68 if (matches(info, queryWords)) { 69 result.add(info.toComponentKey()); 70 } 71 } 72 return result; 73 } 74 matches(AppInfo info, String[] queryWords)75 protected boolean matches(AppInfo info, String[] queryWords) { 76 String title = info.title.toString(); 77 String[] words = SPLIT_PATTERN.split(title.toLowerCase()); 78 for (int qi = 0; qi < queryWords.length; qi++) { 79 boolean foundMatch = false; 80 for (int i = 0; i < words.length; i++) { 81 if (words[i].startsWith(queryWords[qi])) { 82 foundMatch = true; 83 break; 84 } 85 } 86 if (!foundMatch) { 87 // If there is a word in the query that does not match any words in this 88 // title, so skip it. 89 return false; 90 } 91 } 92 return true; 93 } 94 } 95