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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.makedict.BinaryDictDecoder.CharEncoding;
import com.android.inputmethod.latin.makedict.BinaryDictDecoder.FusionDictionaryBufferInterface;
import com.android.inputmethod.latin.makedict.decoder.HeaderReaderInterface;
import com.android.inputmethod.latin.utils.ByteArrayWrapper;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.HashMap;
public class BinaryDictReader implements HeaderReaderInterface {
public interface FusionDictionaryBufferFactory {
public FusionDictionaryBufferInterface getFusionDictionaryBuffer(final File file)
throws FileNotFoundException, IOException;
}
/**
* Creates FusionDictionaryBuffer from a ByteBuffer
*/
public static final class FusionDictionaryBufferFromByteBufferFactory
implements FusionDictionaryBufferFactory {
@Override
public FusionDictionaryBufferInterface getFusionDictionaryBuffer(final File file)
throws FileNotFoundException, IOException {
FileInputStream inStream = null;
ByteBuffer buffer = null;
try {
inStream = new FileInputStream(file);
buffer = inStream.getChannel().map(FileChannel.MapMode.READ_ONLY,
0, file.length());
} finally {
if (inStream != null) {
inStream.close();
}
}
if (buffer != null) {
return new BinaryDictDecoder.ByteBufferWrapper(buffer);
}
return null;
}
}
/**
* Creates FusionDictionaryBuffer from a byte array
*/
public static final class FusionDictionaryBufferFromByteArrayFactory
implements FusionDictionaryBufferFactory {
@Override
public FusionDictionaryBufferInterface getFusionDictionaryBuffer(final File file)
throws FileNotFoundException, IOException {
FileInputStream inStream = null;
try {
inStream = new FileInputStream(file);
final byte[] array = new byte[(int) file.length()];
inStream.read(array);
return new ByteArrayWrapper(array);
} finally {
if (inStream != null) {
inStream.close();
}
}
}
}
/**
* Creates FusionDictionaryBuffer from a RandomAccessFile.
*/
@UsedForTesting
public static final class FusionDictionaryBufferFromWritableByteBufferFactory
implements FusionDictionaryBufferFactory {
@Override
public FusionDictionaryBufferInterface getFusionDictionaryBuffer(final File file)
throws FileNotFoundException, IOException {
RandomAccessFile raFile = null;
ByteBuffer buffer = null;
try {
raFile = new RandomAccessFile(file, "rw");
buffer = raFile.getChannel().map(FileChannel.MapMode.READ_WRITE, 0, file.length());
} finally {
if (raFile != null) {
raFile.close();
}
}
if (buffer != null) {
return new BinaryDictDecoder.ByteBufferWrapper(buffer);
}
return null;
}
}
private final File mDictionaryBinaryFile;
private FusionDictionaryBufferInterface mFusionDictionaryBuffer;
public BinaryDictReader(final File file) {
mDictionaryBinaryFile = file;
mFusionDictionaryBuffer = null;
}
public void openBuffer(final FusionDictionaryBufferFactory factory)
throws FileNotFoundException, IOException {
mFusionDictionaryBuffer = factory.getFusionDictionaryBuffer(mDictionaryBinaryFile);
}
public FusionDictionaryBufferInterface getBuffer() {
return mFusionDictionaryBuffer;
}
@UsedForTesting
public FusionDictionaryBufferInterface openAndGetBuffer(
final FusionDictionaryBufferFactory factory)
throws FileNotFoundException, IOException {
openBuffer(factory);
return getBuffer();
}
// The implementation of HeaderReaderInterface
@Override
public int readVersion() throws IOException, UnsupportedFormatException {
return BinaryDictDecoder.checkFormatVersion(mFusionDictionaryBuffer);
}
@Override
public int readOptionFlags() {
return mFusionDictionaryBuffer.readUnsignedShort();
}
@Override
public int readHeaderSize() {
return mFusionDictionaryBuffer.readInt();
}
@Override
public HashMap<String, String> readAttributes(final int headerSize) {
final HashMap<String, String> attributes = new HashMap<String, String>();
while (mFusionDictionaryBuffer.position() < headerSize) {
// We can avoid infinite loop here since mFusionDictonary.position() is always increased
// by calling CharEncoding.readString.
final String key = CharEncoding.readString(mFusionDictionaryBuffer);
final String value = CharEncoding.readString(mFusionDictionaryBuffer);
attributes.put(key, value);
}
mFusionDictionaryBuffer.position(headerSize);
return attributes;
}
}
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