UnzipEclipse.java

/*
 * Jabox Open Source Version
 * Copyright (C) 2009-2010 Dimitris Kapanidis                                                                                                                          
 * 
 * This file is part of Jabox
 * 
 * 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 3 of the License, 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 this program.  If not, see http://www.gnu.org/licenses/.
 */
package org.jabox.eclipse_startup;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

public class UnzipEclipse {
    public static void unzip(final File file, final File eclipseHome)
            throws ZipException, IOException {
        eclipseHome.mkdirs();

        try {
            ZipFile zipFile = new ZipFile(file);

            Enumeration<? extends ZipEntry> entries = zipFile.entries();

            entries = zipFile.entries();

            while (entries.hasMoreElements()) {
                ZipEntry entry = entries.nextElement();

                if (entry.isDirectory()) {
                    // Assume directories are stored parents first then
                    // children.
                    System.err.println("Extracting directory: "
                        + entry.getName());
                    // This is not robust, just for demonstration purposes.
                    new File(eclipseHome, entry.getName()).mkdir();
                    continue;
                }

                System.err.println("Extracting file: " + entry.getName());
                copyInputStream(zipFile.getInputStream(entry),
                    new BufferedOutputStream(new FileOutputStream(
                        new File(eclipseHome, entry.getName()))));
            }

            zipFile.close();
        } catch (IOException ioe) {
            System.err.println("Unhandled exception:");
            ioe.printStackTrace();
            return;
        }
    }

    public static final void copyInputStream(final InputStream in,
            final OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int len;

        while ((len = in.read(buffer)) >= 0) {
            out.write(buffer, 0, len);
        }

        in.close();
        out.close();
    }
}