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The Object Composition library merges multiple Java objects into a single multi-subject object.

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/*
 * Copyright (c) 2009, James Leigh All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution. 
 * - Neither the name of the openrdf.org nor the names of its contributors may
 *   be used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 */
package org.openrdf.repository.object.compiler;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;

/**
 * Packages a directy into a Jar and writes the concept index files.
 * 
 * @author James Leigh
 *
 */
public class JarPacker {

	private File dir;

	public JarPacker(File dir) {
		this.dir = dir;
	}

	public void packageJar(File output) throws IOException {
		FileOutputStream stream = new FileOutputStream(output);
		JarOutputStream jar = new JarOutputStream(stream);
		try {
			packaFiles(dir, dir, jar, 256);
		} finally {
			jar.close();
			stream.close();
		}
	}

	private void packaFiles(File base, File dir, JarOutputStream jar, int max)
			throws IOException, FileNotFoundException {
		if (max < 0)
			throw new AssertionError("Recursive Path: " + dir);
		for (File file : dir.listFiles()) {
			if (file.isDirectory()) {
				packaFiles(base, file, jar, max - 1);
			} else if (file.exists()) {
				String path = file.getAbsolutePath();
				path = path.substring(base.getAbsolutePath().length() + 1);
				// replace separatorChar by '/' on all platforms
				if (File.separatorChar != '/') {
					path = path.replace(File.separatorChar, '/');
				}
				jar.putNextEntry(new JarEntry(path));
				copyInto(file.toURI().toURL(), jar);
				file.delete();
			}
		}
	}

	private void copyInto(URL source, OutputStream out)
			throws FileNotFoundException, IOException {
		InputStream in = source.openStream();
		try {
			int read;
			byte[] buf = new byte[512];
			while ((read = in.read(buf)) > 0) {
				out.write(buf, 0, read);
			}
		} finally {
			in.close();
		}
	}
}