120 lines
4.1 KiB
Java
120 lines
4.1 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin;
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import com.android.inputmethod.keyboard.ProximityInfo;
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import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
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import java.util.ArrayList;
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import java.util.Locale;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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/**
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* This class provides binary dictionary reading operations with locking. An instance of this class
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* can be used by multiple threads. Note that different session IDs must be used when multiple
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* threads get suggestions using this class.
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*/
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public final class ReadOnlyBinaryDictionary extends Dictionary {
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/**
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* A lock for accessing binary dictionary. Only closing binary dictionary is the operation
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* that change the state of dictionary.
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*/
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private final ReentrantReadWriteLock mLock = new ReentrantReadWriteLock();
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private final BinaryDictionary mBinaryDictionary;
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public ReadOnlyBinaryDictionary(final String filename, final long offset, final long length,
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final boolean useFullEditDistance, final Locale locale, final String dictType) {
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super(dictType);
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mBinaryDictionary = new BinaryDictionary(filename, offset, length, useFullEditDistance,
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locale, dictType, false /* isUpdatable */);
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}
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public boolean isValidDictionary() {
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return mBinaryDictionary.isValidDictionary();
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}
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@Override
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public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
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final String prevWord, final ProximityInfo proximityInfo,
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final boolean blockOffensiveWords, final int[] additionalFeaturesOptions) {
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return getSuggestionsWithSessionId(composer, prevWord, proximityInfo, blockOffensiveWords,
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additionalFeaturesOptions, 0 /* sessionId */);
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}
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@Override
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public ArrayList<SuggestedWordInfo> getSuggestionsWithSessionId(final WordComposer composer,
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final String prevWord, final ProximityInfo proximityInfo,
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final boolean blockOffensiveWords, final int[] additionalFeaturesOptions,
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final int sessionId) {
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if (mLock.readLock().tryLock()) {
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try {
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return mBinaryDictionary.getSuggestions(composer, prevWord, proximityInfo,
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blockOffensiveWords, additionalFeaturesOptions);
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} finally {
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mLock.readLock().unlock();
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}
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}
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return null;
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}
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@Override
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public boolean isValidWord(final String word) {
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if (mLock.readLock().tryLock()) {
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try {
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return mBinaryDictionary.isValidWord(word);
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} finally {
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mLock.readLock().unlock();
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}
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}
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return false;
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}
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@Override
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public boolean shouldAutoCommit(final SuggestedWordInfo candidate) {
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if (mLock.readLock().tryLock()) {
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try {
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return mBinaryDictionary.shouldAutoCommit(candidate);
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} finally {
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mLock.readLock().unlock();
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}
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}
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return false;
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}
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@Override
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public int getFrequency(final String word) {
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if (mLock.readLock().tryLock()) {
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try {
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return mBinaryDictionary.getFrequency(word);
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} finally {
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mLock.readLock().unlock();
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}
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}
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return NOT_A_PROBABILITY;
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}
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@Override
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public void close() {
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mLock.writeLock().lock();
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try {
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mBinaryDictionary.close();
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} finally {
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mLock.writeLock().unlock();
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}
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}
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}
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