1 /* 2 * Copyright (C) 2013 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 17 package com.android.inputmethod.latin.personalization; 18 19 import android.content.Context; 20 import android.util.Log; 21 22 import com.android.inputmethod.latin.common.FileUtils; 23 24 import java.io.File; 25 import java.io.FilenameFilter; 26 import java.lang.ref.SoftReference; 27 import java.util.Locale; 28 import java.util.concurrent.ConcurrentHashMap; 29 30 import javax.annotation.Nonnull; 31 import javax.annotation.Nullable; 32 33 /** 34 * Helps handle and manage personalized dictionaries such as {@link UserHistoryDictionary}. 35 */ 36 public class PersonalizationHelper { 37 private static final String TAG = PersonalizationHelper.class.getSimpleName(); 38 private static final boolean DEBUG = false; 39 40 private static final ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>> 41 sLangUserHistoryDictCache = new ConcurrentHashMap<>(); 42 43 @Nonnull getUserHistoryDictionary( final Context context, final Locale locale, @Nullable final String accountName)44 public static UserHistoryDictionary getUserHistoryDictionary( 45 final Context context, final Locale locale, @Nullable final String accountName) { 46 String lookupStr = locale.toString(); 47 if (accountName != null) { 48 lookupStr += "." + accountName; 49 } 50 synchronized (sLangUserHistoryDictCache) { 51 if (sLangUserHistoryDictCache.containsKey(lookupStr)) { 52 final SoftReference<UserHistoryDictionary> ref = 53 sLangUserHistoryDictCache.get(lookupStr); 54 final UserHistoryDictionary dict = ref == null ? null : ref.get(); 55 if (dict != null) { 56 if (DEBUG) { 57 Log.d(TAG, "Use cached UserHistoryDictionary with lookup: " + lookupStr); 58 } 59 dict.reloadDictionaryIfRequired(); 60 return dict; 61 } 62 } 63 final UserHistoryDictionary dict = new UserHistoryDictionary( 64 context, locale, accountName); 65 sLangUserHistoryDictCache.put(lookupStr, new SoftReference<>(dict)); 66 return dict; 67 } 68 } 69 removeAllUserHistoryDictionaries(final Context context)70 public static void removeAllUserHistoryDictionaries(final Context context) { 71 synchronized (sLangUserHistoryDictCache) { 72 for (final ConcurrentHashMap.Entry<String, SoftReference<UserHistoryDictionary>> entry 73 : sLangUserHistoryDictCache.entrySet()) { 74 if (entry.getValue() != null) { 75 final UserHistoryDictionary dict = entry.getValue().get(); 76 if (dict != null) { 77 dict.clear(); 78 } 79 } 80 } 81 sLangUserHistoryDictCache.clear(); 82 final File filesDir = context.getFilesDir(); 83 if (filesDir == null) { 84 Log.e(TAG, "context.getFilesDir() returned null."); 85 return; 86 } 87 final boolean filesDeleted = FileUtils.deleteFilteredFiles( 88 filesDir, new DictFilter(UserHistoryDictionary.NAME)); 89 if (!filesDeleted) { 90 Log.e(TAG, "Cannot remove dictionary files. filesDir: " + filesDir.getAbsolutePath() 91 + ", dictNamePrefix: " + UserHistoryDictionary.NAME); 92 } 93 } 94 } 95 96 private static class DictFilter implements FilenameFilter { 97 private final String mName; 98 DictFilter(final String name)99 DictFilter(final String name) { 100 mName = name; 101 } 102 103 @Override accept(final File dir, final String name)104 public boolean accept(final File dir, final String name) { 105 return name.startsWith(mName); 106 } 107 } 108 } 109