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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;
import com.android.inputmethod.keyboard.ProximityInfo;
import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
import com.android.inputmethod.latin.settings.SettingsValuesForSuggestion;
import java.util.ArrayList;
import java.util.Locale;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* This class provides binary dictionary reading operations with locking. An instance of this class
* can be used by multiple threads. Note that different session IDs must be used when multiple
* threads get suggestions using this class.
*/
public final class ReadOnlyBinaryDictionary extends Dictionary {
/**
* A lock for accessing binary dictionary. Only closing binary dictionary is the operation
* that change the state of dictionary.
*/
private final ReentrantReadWriteLock mLock = new ReentrantReadWriteLock();
private final BinaryDictionary mBinaryDictionary;
public ReadOnlyBinaryDictionary(final String filename, final long offset, final long length,
final boolean useFullEditDistance, final Locale locale, final String dictType) {
super(dictType, locale);
mBinaryDictionary = new BinaryDictionary(filename, offset, length, useFullEditDistance,
locale, dictType, false /* isUpdatable */);
}
public boolean isValidDictionary() {
return mBinaryDictionary.isValidDictionary();
}
@Override
public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
final NgramContext ngramContext, final ProximityInfo proximityInfo,
final SettingsValuesForSuggestion settingsValuesForSuggestion,
final int sessionId, final float weightForLocale,
final float[] inOutWeightOfLangModelVsSpatialModel) {
if (mLock.readLock().tryLock()) {
try {
return mBinaryDictionary.getSuggestions(composer, ngramContext, proximityInfo,
settingsValuesForSuggestion, sessionId, weightForLocale,
inOutWeightOfLangModelVsSpatialModel);
} finally {
mLock.readLock().unlock();
}
}
return null;
}
@Override
public boolean isInDictionary(final String word) {
if (mLock.readLock().tryLock()) {
try {
return mBinaryDictionary.isInDictionary(word);
} finally {
mLock.readLock().unlock();
}
}
return false;
}
@Override
public boolean shouldAutoCommit(final SuggestedWordInfo candidate) {
if (mLock.readLock().tryLock()) {
try {
return mBinaryDictionary.shouldAutoCommit(candidate);
} finally {
mLock.readLock().unlock();
}
}
return false;
}
@Override
public int getFrequency(final String word) {
if (mLock.readLock().tryLock()) {
try {
return mBinaryDictionary.getFrequency(word);
} finally {
mLock.readLock().unlock();
}
}
return NOT_A_PROBABILITY;
}
@Override
public int getMaxFrequencyOfExactMatches(final String word) {
if (mLock.readLock().tryLock()) {
try {
return mBinaryDictionary.getMaxFrequencyOfExactMatches(word);
} finally {
mLock.readLock().unlock();
}
}
return NOT_A_PROBABILITY;
}
@Override
public void close() {
mLock.writeLock().lock();
try {
mBinaryDictionary.close();
} finally {
mLock.writeLock().unlock();
}
}
}
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