CommonsCompressor.java

package com.jarvis.cache.compress;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.compressors.CompressorOutputStream;
import org.apache.commons.compress.compressors.CompressorStreamFactory;

public class CommonsCompressor implements ICompressor {

    private static final int BUFFER=1024;

    private static final CompressorStreamFactory factory=new CompressorStreamFactory();

    private String name;

    public CommonsCompressor(String name) {
        this.name=name;
    }

    @Override
    public byte[] compress(ByteArrayInputStream bais) throws Exception {
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        CompressorOutputStream cos=factory.createCompressorOutputStream(name, baos);
        int len;
        byte buf[]=new byte[BUFFER];
        while((len=bais.read(buf, 0, BUFFER)) != -1) {
            cos.write(buf, 0, len);
        }
        cos.flush();
        cos.close();
        byte[] output=baos.toByteArray();
        baos.flush();
        baos.close();
        bais.close();
        return output;
    }

    @Override
    public byte[] decompress(ByteArrayInputStream bais) throws Exception {
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        CompressorInputStream cis=factory.createCompressorInputStream(name, bais);
        int len;
        byte buf[]=new byte[BUFFER];
        while((len=cis.read(buf, 0, BUFFER)) != -1) {
            baos.write(buf, 0, len);
        }
        cis.close();

        byte[] output=baos.toByteArray();
        baos.flush();
        baos.close();
        bais.close();
        return output;
    }

}