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/*
* Copyright (C) 2013 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.inputmethod.latin.personalization;
import android.content.Context;
import android.util.Log;
import com.android.inputmethod.latin.common.FileUtils;
import java.io.File;
import java.io.FilenameFilter;
import java.lang.ref.SoftReference;
import java.util.Locale;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
/**
* Helps handle and manage personalized dictionaries such as {@link UserHistoryDictionary}.
*/
public class PersonalizationHelper {
private static final String TAG = PersonalizationHelper.class.getSimpleName();
private static final boolean DEBUG = false;
private static final ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>
sLangUserHistoryDictCache = new ConcurrentHashMap<>();
@Nonnull
public static UserHistoryDictionary getUserHistoryDictionary(
final Context context, final Locale locale, @Nullable final String accountName) {
String lookupStr = locale.toString();
if (accountName != null) {
lookupStr += "." + accountName;
}
synchronized (sLangUserHistoryDictCache) {
if (sLangUserHistoryDictCache.containsKey(lookupStr)) {
final SoftReference<UserHistoryDictionary> ref =
sLangUserHistoryDictCache.get(lookupStr);
final UserHistoryDictionary dict = ref == null ? null : ref.get();
if (dict != null) {
if (DEBUG) {
Log.d(TAG, "Use cached UserHistoryDictionary with lookup: " + lookupStr);
}
dict.reloadDictionaryIfRequired();
return dict;
}
}
final UserHistoryDictionary dict = new UserHistoryDictionary(
context, locale, accountName);
sLangUserHistoryDictCache.put(lookupStr, new SoftReference<>(dict));
return dict;
}
}
private static int sCurrentTimestampForTesting = 0;
public static void currentTimeChangedForTesting(final int currentTimestamp) {
if (TimeUnit.MILLISECONDS.toSeconds(
DictionaryDecayBroadcastReciever.DICTIONARY_DECAY_INTERVAL_IN_MILLIS)
< currentTimestamp - sCurrentTimestampForTesting) {
runGCOnAllOpenedUserHistoryDictionaries();
}
}
public static void runGCOnAllOpenedUserHistoryDictionaries() {
runGCOnAllDictionariesIfRequired(sLangUserHistoryDictCache);
}
private static <T extends DecayingExpandableBinaryDictionaryBase>
void runGCOnAllDictionariesIfRequired(
final ConcurrentHashMap<String, SoftReference<T>> dictionaryMap) {
for (final ConcurrentHashMap.Entry<String, SoftReference<T>> entry
: dictionaryMap.entrySet()) {
final DecayingExpandableBinaryDictionaryBase dict = entry.getValue().get();
if (dict != null) {
dict.runGCIfRequired();
} else {
dictionaryMap.remove(entry.getKey());
}
}
}
public static void removeAllUserHistoryDictionaries(final Context context) {
removeAllDictionaries(context, sLangUserHistoryDictCache,
UserHistoryDictionary.NAME);
}
private static <T extends DecayingExpandableBinaryDictionaryBase> void removeAllDictionaries(
final Context context, final ConcurrentHashMap<String, SoftReference<T>> dictionaryMap,
final String dictNamePrefix) {
synchronized (dictionaryMap) {
for (final ConcurrentHashMap.Entry<String, SoftReference<T>> entry
: dictionaryMap.entrySet()) {
if (entry.getValue() != null) {
final DecayingExpandableBinaryDictionaryBase dict = entry.getValue().get();
if (dict != null) {
dict.clear();
}
}
}
dictionaryMap.clear();
final File filesDir = context.getFilesDir();
if (filesDir == null) {
Log.e(TAG, "context.getFilesDir() returned null.");
return;
}
if (!FileUtils.deleteFilteredFiles(filesDir, new DictFilter(dictNamePrefix))) {
Log.e(TAG, "Cannot remove all existing dictionary files. filesDir: "
+ filesDir.getAbsolutePath() + ", dictNamePrefix: " + dictNamePrefix);
}
}
}
private static class DictFilter implements FilenameFilter {
private final String mName;
DictFilter(final String name) {
mName = name;
}
@Override
public boolean accept(final File dir, final String name) {
return name.startsWith(mName);
}
}
}
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