Unzip.java

/**
 *
 * Copyright (c) 2009-2016 Freedomotic team http://freedomotic.com
 *
 * This file is part of Freedomotic
 *
 * This Program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2, or (at your option) any later version.
 *
 * This Program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * Freedomotic; see the file COPYING. If not, see
 * <http://www.gnu.org/licenses/>.
 */
package com.freedomotic.util;

/**
 * Unzip code found on
 * http://stackoverflow.com/questions/981578/how-to-unzip-files-recursively-in-java
 * all credits to respective authors
 */
import com.freedomotic.app.Freedomotic;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

/**
 *
 * @author Enrico Nicoletti
 */
public class Unzip {

    private static final Logger LOG = LoggerFactory.getLogger(Unzip.class.getName());

    private Unzip() {
    }

    /**
     *
     * @param zipFile
     * @throws ZipException
     * @throws IOException
     */
    static public void unzip(String zipFile) throws ZipException, IOException {

        int BUFFER = 2048;
        File file = new File(zipFile);

        ZipFile zip = new ZipFile(file);
        String newPath = zipFile.substring(0, zipFile.length() - 4);
        //simulates the unzip here feature
        newPath = newPath.substring(0, newPath.lastIndexOf(File.separator));

        Enumeration<? extends ZipEntry> zipFileEntries = zip.entries();
        
        // Process each entry
        while (zipFileEntries.hasMoreElements()) {
            // grab a zip file entry
            ZipEntry entry = zipFileEntries.nextElement();
            String currentEntry = entry.getName();
            File destFile = new File(newPath, currentEntry);
            File destinationParent = destFile.getParentFile();

            // create the parent directory structure if needed
            destinationParent.mkdirs();
            BufferedOutputStream dest = null;
            BufferedInputStream is = null;
            FileOutputStream fos = null;
            try {
                if (!entry.isDirectory()) {
                    is = new BufferedInputStream(zip.getInputStream(entry));
                    int currentByte;

                    // establish buffer for writing file
                    byte[] data = new byte[BUFFER];

                    // write the current file to disk
                    fos = new FileOutputStream(destFile);
                    dest = new BufferedOutputStream(fos, BUFFER);

                    // read and write until last byte is encountered
                    while ((currentByte = is.read(data, 0, BUFFER)) != -1) {
                        dest.write(data, 0, currentByte);
                    }

                }
            } catch (IOException ex) {
                LOG.error(Freedomotic.getStackTraceInfo(ex));
            } finally {
                if (dest != null) {
                    dest.flush();
                    dest.close();
                }
                if (is != null) {
                    is.close();
                }
                if (fos != null) {
                    fos.close();
                }
            }

            if (currentEntry.endsWith(".zip")) {
                // found a zip file, try to open
                unzip(destFile.getAbsolutePath());
            }
        }
    }

}