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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.makedict;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.BinaryDictionary;
import com.android.inputmethod.latin.common.FileUtils;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
/**
* An implementation of binary dictionary decoder for version 4 binary dictionary.
*/
@UsedForTesting
public class Ver4DictDecoder extends AbstractDictDecoder {
final File mDictDirectory;
@UsedForTesting
/* package */ Ver4DictDecoder(final File dictDirectory) {
mDictDirectory = dictDirectory;
}
@Override
public DictionaryHeader readHeader() throws IOException, UnsupportedFormatException {
// dictType is not being used in dicttool. Passing an empty string.
final BinaryDictionary binaryDictionary= new BinaryDictionary(
mDictDirectory.getAbsolutePath(), 0 /* offset */, 0 /* length */,
true /* useFullEditDistance */, null /* locale */,
"" /* dictType */, true /* isUpdatable */);
final DictionaryHeader header = binaryDictionary.getHeader();
binaryDictionary.close();
if (header == null) {
throw new IOException("Cannot read the dictionary header.");
}
return header;
}
@Override
public FusionDictionary readDictionaryBinary(final boolean deleteDictIfBroken)
throws FileNotFoundException, IOException, UnsupportedFormatException {
// dictType is not being used in dicttool. Passing an empty string.
final BinaryDictionary binaryDictionary = new BinaryDictionary(
mDictDirectory.getAbsolutePath(), 0 /* offset */, 0 /* length */,
true /* useFullEditDistance */, null /* locale */,
"" /* dictType */, true /* isUpdatable */);
final DictionaryHeader header = readHeader();
final FusionDictionary fusionDict =
new FusionDictionary(new FusionDictionary.PtNodeArray(), header.mDictionaryOptions);
int token = 0;
final ArrayList<WordProperty> wordProperties = new ArrayList<>();
do {
final BinaryDictionary.GetNextWordPropertyResult result =
binaryDictionary.getNextWordProperty(token);
final WordProperty wordProperty = result.mWordProperty;
if (wordProperty == null) {
binaryDictionary.close();
if (deleteDictIfBroken) {
FileUtils.deleteRecursively(mDictDirectory);
}
return null;
}
wordProperties.add(wordProperty);
token = result.mNextToken;
} while (token != 0);
// Insert unigrams into the fusion dictionary.
for (final WordProperty wordProperty : wordProperties) {
fusionDict.add(wordProperty.mWord, wordProperty.mProbabilityInfo,
wordProperty.mIsNotAWord,
wordProperty.mIsPossiblyOffensive);
}
// Insert bigrams into the fusion dictionary.
// TODO: Support ngrams.
for (final WordProperty wordProperty : wordProperties) {
if (!wordProperty.mHasNgrams) {
continue;
}
final String word0 = wordProperty.mWord;
for (final WeightedString bigram : wordProperty.getBigrams()) {
fusionDict.setBigram(word0, bigram.mWord, bigram.mProbabilityInfo);
}
}
binaryDictionary.close();
return fusionDict;
}
}
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