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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 java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* An auxiliary class for writing data associated with SparseTable to files.
*/
public class SparseTableContentWriter {
public interface SparseTableContentWriterInterface {
public void write(final OutputStream outStream) throws IOException;
}
private final int mContentCount;
private final SparseTable mSparseTable;
private final File mLookupTableFile;
protected final File mBaseDir;
private final File[] mAddressTableFiles;
private final File[] mContentFiles;
protected final OutputStream[] mContentOutStreams;
/**
* Sole constructor of SparseTableContentWriter.
*
* @param name the name of SparseTable.
* @param initialCapacity the initial capacity 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 contentIds the ids of contents. These ids are used for a suffix of a name of address
* files and content files.
*/
public SparseTableContentWriter(final String name, final int initialCapacity,
final int blockSize, final File baseDir, final String[] contentFilenames,
final String[] contentIds) {
if (contentFilenames.length != contentIds.length) {
throw new RuntimeException("The length of contentFilenames and the length of"
+ " contentIds are different " + contentFilenames.length + ", "
+ contentIds.length);
}
mContentCount = contentFilenames.length;
mSparseTable = new SparseTable(initialCapacity, blockSize, mContentCount);
mLookupTableFile = new File(baseDir, name + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
mAddressTableFiles = new File[mContentCount];
mContentFiles = new File[mContentCount];
mBaseDir = baseDir;
for (int i = 0; i < mContentCount; ++i) {
mAddressTableFiles[i] = new File(mBaseDir,
name + FormatSpec.CONTENT_TABLE_FILE_SUFFIX + contentIds[i]);
mContentFiles[i] = new File(mBaseDir, contentFilenames[i] + contentIds[i]);
}
mContentOutStreams = new OutputStream[mContentCount];
}
public void openStreams() throws FileNotFoundException {
for (int i = 0; i < mContentCount; ++i) {
mContentOutStreams[i] = new FileOutputStream(mContentFiles[i]);
}
}
protected void write(final int contentIndex, final int index,
final SparseTableContentWriterInterface writer) throws IOException {
mSparseTable.set(contentIndex, index, (int) mContentFiles[contentIndex].length());
writer.write(mContentOutStreams[contentIndex]);
mContentOutStreams[contentIndex].flush();
}
public void closeStreams() throws IOException {
mSparseTable.writeToFiles(mLookupTableFile, mAddressTableFiles);
for (int i = 0; i < mContentCount; ++i) {
mContentOutStreams[i].close();
}
}
}
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