org.apache.hama.bsp.message.compress.Bzip2Compressor.java Source code

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Here is the source code for org.apache.hama.bsp.message.compress.Bzip2Compressor.java

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/**
 * 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.hama.bsp.message.compress;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.commons.compress.compressors.CompressorException;
import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.compressors.CompressorOutputStream;
import org.apache.commons.compress.compressors.CompressorStreamFactory;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.io.Writable;

public class Bzip2Compressor<M extends Writable> extends BSPMessageCompressor<M> {

    @Override
    public byte[] compress(byte[] bytes) {
        ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
        DataInputStream in = new DataInputStream(bis);

        ByteArrayOutputStream outBuffer = new ByteArrayOutputStream();
        DataOutputStream out = new DataOutputStream(outBuffer);

        CompressorOutputStream cos = null;
        try {
            cos = new CompressorStreamFactory().createCompressorOutputStream("bzip2", out);
            IOUtils.copy(in, cos);
            cos.close();
        } catch (CompressorException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return outBuffer.toByteArray();
    }

    /**
     * Decompresses a BSPCompressedBundle and returns the corresponding
     * BSPMessageBundle.
     * 
     * @param compressedBytes
     * @return The result after decompressing BSPMessageBundle.
     */
    @Override
    public byte[] decompress(byte[] compressedBytes) {
        ByteArrayInputStream bis = new ByteArrayInputStream(compressedBytes);
        DataInputStream in = new DataInputStream(bis);

        ByteArrayOutputStream outBuffer = new ByteArrayOutputStream();
        DataOutputStream out = new DataOutputStream(outBuffer);
        try {

            final CompressorInputStream cin = new CompressorStreamFactory().createCompressorInputStream("bzip2",
                    in);
            IOUtils.copy(cin, out);
            in.close();
        } catch (CompressorException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return outBuffer.toByteArray();
    }

}