Glassfish example source code file (Rejar.java)

This example Glassfish source code file (Rejar.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

bytearrayoutputstream, bytearrayoutputstream, file, fileoutputstream, io, ioexception, ioexception, jar, jarentry, jarentry, jaroutputstream, jaroutputstream, manifest, map, nio, outputstream, set, util

The Glassfish Rejar.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.glassfish.bootstrap;

import java.io.*;
import java.util.*;
import java.util.jar.*;
import java.nio.channels.Channels;
import java.nio.channels.WritableByteChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.ByteBuffer;

/**
 * Created by IntelliJ IDEA.
 * User: dochez
 * Date: Nov 10, 2008
 * Time: 8:53:34 PM
 * To change this template use File | Settings | File Templates.
 */
public class Rejar {

    public Rejar() {
    }
    
    public void rejar(File out, File modules) throws IOException {

        Map<String, ByteArrayOutputStream> metadata = new HashMap();
        FileOutputStream fos = new FileOutputStream(out);
        Set<String> names = new HashSet();
        names.add(Attributes.Name.MAIN_CLASS.toString());
        JarOutputStream jos = new JarOutputStream(fos, getManifest());
        processDirectory(jos, modules, names, metadata);
        for (File directory : modules.listFiles(new FileFilter() {
            public boolean accept(File pathname) {
                return pathname.isDirectory();
            }
        })) {
            processDirectory(jos, directory, names, metadata);
        }

        // copy the inhabitants files.
        for (Map.Entry<String, ByteArrayOutputStream> e : metadata.entrySet()) {
            copy(e.getValue().toByteArray(), e.getKey(), jos);
        }
        jos.flush();
        jos.close();            
    }

    protected Manifest getManifest() throws IOException {
        Manifest m = new Manifest();
        m.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0"); 
        m.getMainAttributes().put(Attributes.Name.MAIN_CLASS, "com.sun.enterprise.glassfish.bootstrap.ASMain");
        return m;
    }

    protected void processDirectory(JarOutputStream jos, File directory, Set<String> names, Map metadata ) throws IOException {

            for (File module : directory.listFiles(new FileFilter() {
                public boolean accept(File pathname) {
                    if (pathname.getName().endsWith("jar")) {
                        return true;
                    }
                    return false;
                }
            })) {
                // add module
                JarFile in = new JarFile(module);
                try {
                    Enumeration<JarEntry> entries = in.entries();
                    while (entries.hasMoreElements()) {
                        JarEntry je = entries.nextElement();
                        if (je.getName().endsWith("MANIFEST.MF") || names.contains(je.getName())) {
                            continue;
                        }
                        if (je.isDirectory())
                            continue;

                        if (je.getName().startsWith("META-INF/inhabitants/")
                                || je.getName().startsWith("META-INF/services/")) {
                            ByteArrayOutputStream stream = metadata.get(je.getName());
                            if (stream==null) {
                                metadata.put(je.getName(), stream = new ByteArrayOutputStream());
                            }
                            stream.write(("# from "+ module.getName() + "\n").getBytes());
                            copy(in, je, stream);
                        } else {
                            names.add(je.getName());
                            copy(in, je, jos);
                        }
                    }
                } finally {
                    if (in != null) {
                        try {
                            in.close();
                        } catch (Throwable t) {
                                // Ignore
                        }
                    }
                }

            };
    }

    protected  void copy(JarFile in, JarEntry je, JarOutputStream jos) throws IOException {
        try {
            jos.putNextEntry(new JarEntry(je.getName()));
            copy(in, je, (OutputStream) jos);
        } finally {
            jos.flush();
            jos.closeEntry();
        }
    }

    protected void copy(JarFile in, JarEntry je, OutputStream os) throws IOException {
        copy(in, je, Channels.newChannel(os));
    }

    protected void copy(JarFile in, JarEntry je, WritableByteChannel out) throws IOException {
        InputStream is = in.getInputStream(je);
        try {
            ReadableByteChannel inChannel = Channels.newChannel(is);
            ByteBuffer byteBuffer = ByteBuffer.allocate(Long.valueOf(je.getSize()).intValue());
            inChannel.read(byteBuffer);
            byteBuffer.rewind();
            out.write(byteBuffer);
        } finally {
            is.close();
        }
    }

    protected void copy(byte[] bytes, String name, JarOutputStream jos) throws IOException {
        try {
            jos.putNextEntry(new JarEntry(name));
            jos.write(bytes);
        } finally {
            jos.closeEntry();
        }
    }
}