/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.avro.file;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import org.apache.commons.compress.compressors.xz.XZCompressorInputStream;
import org.apache.commons.compress.compressors.xz.XZCompressorOutputStream;
import org.apache.commons.compress.utils.IOUtils;
/** * Implements xz compression and decompression. */
public class XZCodec extends Codec {
static class Option extends CodecFactory {
private int compressionLevel;
Option(int compressionLevel) {
this.compressionLevel = compressionLevel;
}
@Override
protected Codec createInstance() {
return new XZCodec(compressionLevel);
}
}
private ByteArrayOutputStream outputBuffer;
private int compressionLevel;
public XZCodec(int compressionLevel) {
this.compressionLevel = compressionLevel;
}
@Override
public String getName() {
return DataFileConstants.XZ_CODEC;
}
@Override
public ByteBuffer compress(ByteBuffer data) throws IOException {
ByteArrayOutputStream baos = getOutputBuffer(data.remaining());
OutputStream ios = new XZCompressorOutputStream(baos, compressionLevel);
writeAndClose(data, ios);
return ByteBuffer.wrap(baos.toByteArray());
}
@Override
public ByteBuffer decompress(ByteBuffer data) throws IOException {
ByteArrayOutputStream baos = getOutputBuffer(data.remaining());
InputStream bytesIn = new ByteArrayInputStream(
data.array(),
data.arrayOffset() + data.position(),
data.remaining());
InputStream ios = new XZCompressorInputStream(bytesIn);
try {
IOUtils.copy(ios, baos);
} finally {
ios.close();
}
return ByteBuffer.wrap(baos.toByteArray());
}
private void writeAndClose(ByteBuffer data, OutputStream to) throws IOException {
byte[] input = data.array();
int offset = data.arrayOffset() + data.position();
int length = data.remaining();
try {
to.write(input, offset, length);
} finally {
to.close();
}
}
// get and initialize the output buffer for use.
private ByteArrayOutputStream getOutputBuffer(int suggestedLength) {
if (null == outputBuffer) {
outputBuffer = new ByteArrayOutputStream(suggestedLength);
}
outputBuffer.reset();
return outputBuffer;
}
@Override
public int hashCode() {
return compressionLevel;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (getClass() != obj.getClass())
return false;
XZCodec other = (XZCodec)obj;
return (this.compressionLevel == other.compressionLevel);
}
@Override
public String toString() {
return getName() + "-" + compressionLevel;
}
}