ZipFileIO.java Source code

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Here is the source code for ZipFileIO.java

Source

//The contents of this file are subject to the Mozilla Public License Version 1.1
//(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.mozilla.org/MPL/
//
//Software distributed under the License is distributed on an "AS IS" basis,
//WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
//for the specific language governing rights and
//limitations under the License.
//
//The Original Code is "The Columba Project"
//
//The Initial Developers of the Original Code are Frederik Dietz and Timo Stich.
//Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003. 
//
//All Rights Reserved.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * Zip archive operations are handled by this class.
 * 
 * @author fdietz
 */
public class ZipFileIO {

    /**
     * No instances needed.
     */
    private ZipFileIO() {
        // don't instantiate this class
    }

    /**
     * Extract zip file to destination folder.
     * 
     * @param file
     *            zip file to extract
     * @param destination
     *            destinatin folder
     */
    public static void extract(File file, File destination) throws IOException {
        ZipInputStream in = null;
        OutputStream out = null;
        try {
            // Open the ZIP file
            in = new ZipInputStream(new FileInputStream(file));

            // Get the first entry
            ZipEntry entry = null;

            while ((entry = in.getNextEntry()) != null) {
                String outFilename = entry.getName();

                // Open the output file
                if (entry.isDirectory()) {
                    new File(destination, outFilename).mkdirs();
                } else {
                    out = new FileOutputStream(new File(destination, outFilename));

                    // Transfer bytes from the ZIP file to the output file
                    byte[] buf = new byte[1024];
                    int len;

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

                    // Close the stream
                    out.close();
                }
            }
        } finally {
            // Close the stream
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.close();
            }
        }
    }

    /**
     * Return the first directory of this archive. This is needed to determine
     * the plugin directory.
     * 
     * @param zipFile
     * @return <class>File</class> containing the first entry of this archive
     */
    public static File getFirstFile(File zipFile) throws IOException {
        ZipInputStream in = null;
        try {
            // Open the ZIP file
            in = new ZipInputStream(new FileInputStream(zipFile));

            // Get the first entry
            ZipEntry entry = null;

            while ((entry = in.getNextEntry()) != null) {
                String outFilename = entry.getName();

                if (entry.isDirectory()) {
                    return new File(outFilename);
                }
            }
        } finally {
            if (in != null) {
                // Close the stream
                in.close();
            }
        }
        return null;
    }
}