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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.BinaryDictDecoderUtils.DictBuffer;
import com.android.inputmethod.latin.makedict.DictDecoder.DictionaryBufferFactory;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
/**
* An auxiliary class for reading SparseTable and data written by SparseTableContentWriter.
*/
public class SparseTableContentReader {
/**
* An interface of a function which is passed to SparseTableContentReader.read.
*/
public interface SparseTableContentReaderInterface {
/**
* Reads data.
*
* @param buffer the DictBuffer. The position of the buffer is set to the head of data.
*/
public void read(final DictBuffer buffer);
}
protected final int mContentCount;
protected final int mBlockSize;
protected final File mBaseDir;
protected final File mLookupTableFile;
protected final File[] mAddressTableFiles;
protected final File[] mContentFiles;
protected DictBuffer mLookupTableBuffer;
protected final DictBuffer[] mAddressTableBuffers;
private final DictBuffer[] mContentBuffers;
protected final DictionaryBufferFactory mFactory;
/**
* Sole constructor of SparseTableContentReader.
*
* @param name the name of SparseTable.
* @param blockSize the block size of the content table.
* @param baseDir the directory which contains the files of the content table.
* @param contentFilenames the file names of content files.
* @param contentSuffixes the ids of contents. These ids are used for a suffix of a name of
* address files and content files.
* @param factory the DictionaryBufferFactory which is used for opening the files.
*/
public SparseTableContentReader(final String name, final int blockSize, final File baseDir,
final String[] contentFilenames, final String[] contentSuffixes,
final DictionaryBufferFactory factory) {
if (contentFilenames.length != contentSuffixes.length) {
throw new RuntimeException("The length of contentFilenames and the length of"
+ " contentSuffixes are different " + contentFilenames.length + ", "
+ contentSuffixes.length);
}
mBlockSize = blockSize;
mBaseDir = baseDir;
mFactory = factory;
mContentCount = contentFilenames.length;
mLookupTableFile = new File(baseDir, name + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
mAddressTableFiles = new File[mContentCount];
mContentFiles = new File[mContentCount];
for (int i = 0; i < mContentCount; ++i) {
mAddressTableFiles[i] = new File(mBaseDir,
name + FormatSpec.CONTENT_TABLE_FILE_SUFFIX + contentSuffixes[i]);
mContentFiles[i] = new File(mBaseDir, contentFilenames[i] + contentSuffixes[i]);
}
mAddressTableBuffers = new DictBuffer[mContentCount];
mContentBuffers = new DictBuffer[mContentCount];
}
public void openBuffers() throws FileNotFoundException, IOException {
mLookupTableBuffer = mFactory.getDictionaryBuffer(mLookupTableFile);
for (int i = 0; i < mContentCount; ++i) {
mAddressTableBuffers[i] = mFactory.getDictionaryBuffer(mAddressTableFiles[i]);
mContentBuffers[i] = mFactory.getDictionaryBuffer(mContentFiles[i]);
}
}
/**
* Calls the read() callback of the reader with the appropriate buffer appropriately positioned.
* @param contentNumber the index in the original contentFilenames[] array.
* @param terminalId the terminal ID to read.
* @param reader the reader on which to call the callback.
*/
protected void read(final int contentNumber, final int terminalId,
final SparseTableContentReaderInterface reader) {
if (terminalId < 0 || (terminalId / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES
>= mLookupTableBuffer.limit()) {
return;
}
mLookupTableBuffer.position((terminalId / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES);
final int indexInAddressTable = mLookupTableBuffer.readInt();
if (indexInAddressTable == SparseTable.NOT_EXIST) {
return;
}
mAddressTableBuffers[contentNumber].position(SparseTable.SIZE_OF_INT_IN_BYTES
* ((indexInAddressTable * mBlockSize) + (terminalId % mBlockSize)));
final int address = mAddressTableBuffers[contentNumber].readInt();
if (address == SparseTable.NOT_EXIST) {
return;
}
mContentBuffers[contentNumber].position(address);
reader.read(mContentBuffers[contentNumber]);
}
}
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