source: trunk/gli/src/org/greenstone/gatherer/util/Unzip.java@ 8766

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * <BR><BR>
 *
 * Author: David Bainbridge, Greenstone Digital Library, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * <BR><BR>
 *
 * 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 of the License, or
 * (at your option) any later version.
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */

package org.greenstone.gatherer.util;

import java.io.*;
import java.util.*;
import java.util.zip.*;


public class Unzip 
{

    public static final void copyInputStream(InputStream in, 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();
    }

    public static final void main(String[] args) 
    {
    Enumeration entries;
    ZipFile zipFile;

    if(args.length != 2) {
        System.err.println("Usage: Unzip gsdlhome zipfile");
        return;
    }

    String gsdl_home = args[0];
    String col_dir = gsdl_home + "collect" + File.separator;

    try {
        zipFile = new ZipFile(args[1]);

        entries = zipFile.entries();

        while(entries.hasMoreElements()) {
        ZipEntry entry = (ZipEntry)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.
            String dir_name = entry.getName();
            String full_dir_name = col_dir + dir_name;
            File dirFile = new File(full_dir_name);
            dirFile.mkdir();
        }
        else {
            // System.err.println("Extracting file: " + entry.getName());
            String file_name = entry.getName();
            String full_file_name = col_dir + file_name;
            FileOutputStream fos = new FileOutputStream(full_file_name);
            BufferedOutputStream bos = new BufferedOutputStream(fos);

            copyInputStream(zipFile.getInputStream(entry),bos);
        }
        }

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