net.orpiske.ssps.common.archive.CompressedArchiveUtils.java Source code

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Here is the source code for net.orpiske.ssps.common.archive.CompressedArchiveUtils.java

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/**
   Copyright 2012 Otavio Rodolfo Piske
    
   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 net.orpiske.ssps.common.archive;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.commons.io.IOUtils;

/**
 * Utilities for manipulating compressed archives
 * @author Otavio R. Piske <angusyoung@gmail.com>
 *
 */
public class CompressedArchiveUtils {

    /**
     * Default constructor
     */
    private CompressedArchiveUtils() {
    }

    /**
     * Prepares the destination directory by creating directories if needed 
     * @param destination The destination directory
     * @throws IOException
     */
    public static void prepareDestination(File destination) throws IOException {
        File parent = destination.getParentFile();

        if (!parent.exists()) {
            if (!parent.mkdirs()) {
                throw new IOException("Unable to create destination directory: " + parent.getPath());
            }
        }
    }

    /**
     * Decompress a file
     * @param source the source file to be uncompressed
     * @param destination the destination directory
     * @return the number of bytes read
     * @throws IOException for lower level I/O errors
     */
    public static long gzDecompress(File source, File destination) throws IOException {
        FileOutputStream out;

        prepareDestination(destination);
        out = new FileOutputStream(destination);

        FileInputStream fin = null;
        BufferedInputStream bin = null;
        GzipCompressorInputStream gzIn = null;

        try {
            fin = new FileInputStream(source);
            bin = new BufferedInputStream(fin);
            gzIn = new GzipCompressorInputStream(bin);

            IOUtils.copy(gzIn, out);

            gzIn.close();

            fin.close();
            bin.close();
            out.close();
        } catch (IOException e) {
            IOUtils.closeQuietly(out);

            IOUtils.closeQuietly(fin);
            IOUtils.closeQuietly(bin);
            IOUtils.closeQuietly(gzIn);

            throw e;
        }

        return gzIn.getBytesRead();
    }

    /**
     * Decompress a file
     * @param source the source file to be uncompressed
     * @param destination the destination directory
     * @return the number of bytes read
     * @throws IOException for lower level I/O errors
     */
    public static long bzipDecompress(File source, File destination) throws IOException {
        FileOutputStream out;

        prepareDestination(destination);

        out = new FileOutputStream(destination);

        FileInputStream fin = null;
        BufferedInputStream bin = null;
        BZip2CompressorInputStream bzIn = null;

        try {
            fin = new FileInputStream(source);
            bin = new BufferedInputStream(fin);
            bzIn = new BZip2CompressorInputStream(bin);

            IOUtils.copy(bzIn, out);

            bzIn.close();

            fin.close();
            bin.close();
            out.close();
        } catch (IOException e) {
            IOUtils.closeQuietly(out);

            IOUtils.closeQuietly(fin);
            IOUtils.closeQuietly(bin);
            IOUtils.closeQuietly(bzIn);

            throw e;
        }

        return bzIn.getBytesRead();
    }
}