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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.latin.makedict.DictDecoder.DictionaryBufferFactory;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* An auxiliary class for updating data associated with SparseTable.
*/
public class SparseTableContentUpdater extends SparseTableContentReader {
protected OutputStream mLookupTableOutStream;
protected OutputStream[] mAddressTableOutStreams;
protected OutputStream[] mContentOutStreams;
public SparseTableContentUpdater(final String name, final int blockSize,
final File baseDir, final String[] contentFilenames, final String[] contentIds,
final DictionaryBufferFactory factory) {
super(name, blockSize, baseDir, contentFilenames, contentIds, factory);
mAddressTableOutStreams = new OutputStream[mContentCount];
mContentOutStreams = new OutputStream[mContentCount];
}
protected void openStreamsAndBuffers() throws IOException {
openBuffers();
mLookupTableOutStream = new FileOutputStream(mLookupTableFile, true /* append */);
for (int i = 0; i < mContentCount; ++i) {
mAddressTableOutStreams[i] = new FileOutputStream(mAddressTableFiles[i],
true /* append */);
mContentOutStreams[i] = new FileOutputStream(mContentFiles[i], true /* append */);
}
}
/**
* Set the contentIndex-th elements of contentId-th table.
*
* @param contentId the id of the content table.
* @param contentIndex the index where to set the valie.
* @param value the value to set.
*/
protected void setContentValue(final int contentId, final int contentIndex, final int value)
throws IOException {
if ((contentIndex / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES
>= mLookupTableBuffer.limit()) {
// Need to extend the lookup table
final int currentSize = mLookupTableBuffer.limit()
/ SparseTable.SIZE_OF_INT_IN_BYTES;
final int target = contentIndex / mBlockSize + 1;
for (int i = currentSize; i < target; ++i) {
BinaryDictEncoderUtils.writeUIntToStream(mLookupTableOutStream,
SparseTable.NOT_EXIST, SparseTable.SIZE_OF_INT_IN_BYTES);
}
// We need to reopen the byte buffer of the lookup table because a MappedByteBuffer in
// Java isn't expanded automatically when the underlying file is expanded.
reopenLookupTable();
}
mLookupTableBuffer.position((contentIndex / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES);
int posInAddressTable = mLookupTableBuffer.readInt();
if (posInAddressTable == SparseTable.NOT_EXIST) {
// Need to extend the address table
mLookupTableBuffer.position(mLookupTableBuffer.position()
- SparseTable.SIZE_OF_INT_IN_BYTES);
posInAddressTable = mAddressTableBuffers[0].limit() / mBlockSize;
BinaryDictEncoderUtils.writeUIntToDictBuffer(mLookupTableBuffer,
posInAddressTable, SparseTable.SIZE_OF_INT_IN_BYTES);
for (int i = 0; i < mContentCount; ++i) {
for (int j = 0; j < mBlockSize; ++j) {
BinaryDictEncoderUtils.writeUIntToStream(mAddressTableOutStreams[i],
SparseTable.NOT_EXIST, SparseTable.SIZE_OF_INT_IN_BYTES);
}
}
// We need to reopen the byte buffers of the address tables because a MappedByteBuffer
// in Java isn't expanded automatically when the underlying file is expanded.
reopenAddressTables();
}
posInAddressTable += (contentIndex % mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES;
mAddressTableBuffers[contentId].position(posInAddressTable);
BinaryDictEncoderUtils.writeUIntToDictBuffer(mAddressTableBuffers[contentId],
value, SparseTable.SIZE_OF_INT_IN_BYTES);
}
private void reopenLookupTable() throws IOException {
mLookupTableOutStream.flush();
mLookupTableBuffer = mFactory.getDictionaryBuffer(mLookupTableFile);
}
private void reopenAddressTables() throws IOException {
for (int i = 0; i < mContentCount; ++i) {
mAddressTableOutStreams[i].flush();
mAddressTableBuffers[i] = mFactory.getDictionaryBuffer(mAddressTableFiles[i]);
}
}
protected void close() throws IOException {
mLookupTableOutStream.close();
for (final OutputStream stream : mAddressTableOutStreams) {
stream.close();
}
for (final OutputStream stream : mContentOutStreams) {
stream.close();
}
}
}
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