EDIT

// $Id$

/**

* Copyright (C) 2015 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.server;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

import org.apache.log4j.Logger;

/**

 * This utility extracts files and directories of a standard zip file to

 * a destination directory.

 * @author www.codejava.net

 *

 */

public class UnzipUtility {

    private static final Logger logger = Logger.getLogger(UnzipUtility.class);

    /**

     * Size of the buffer to read/write data

     */

    private static final int BUFFER_SIZE = 4096;

    /**

     * Extracts a zip file specified by the zipFilePath to a directory specified by

     * destDirectory (will be created if does not exists)

     * @param zipFilePath

     * @param destDirectory

     * @throws IOException

     */

    public void unzip(File zipFile, File destDir) throws IOException {

        if (!destDir.exists()) {

            destDir.mkdir();

        }

        String destPath = destDir.getAbsolutePath();

        logger.info("unpacking " + zipFile + " into " + destPath);

        ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFile));

        ZipEntry entry = zipIn.getNextEntry();

        // iterates over entries in the zip file

        while (entry != null) {

            String filePath = destPath + File.separator + entry.getName();

            if (!entry.isDirectory()) {

                // if the entry is a file, extracts it

                extractFile(zipIn, filePath);

            } else {

                // if the entry is a directory, make the directory

                File dir = new File(filePath);

                dir.mkdir();

            }

            zipIn.closeEntry();

            entry = zipIn.getNextEntry();

        }

        zipIn.close();

    }

    /**

     * Extracts a zip entry (file entry)

     * @param zipIn

     * @param filePath

     * @throws IOException

     */

    private void extractFile(ZipInputStream zipIn, String filePath) throws IOException {

        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));

        byte[] bytesIn = new byte[BUFFER_SIZE];

        int read = 0;

        while ((read = zipIn.read(bytesIn)) != -1) {

            bos.write(bytesIn, 0, read);

        }

        bos.close();

    }

}