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Glassfish example source code file (JarHelper.java)
The Glassfish JarHelper.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 org.glassfish.osgijavaeebase; import java.io.*; import java.net.URLConnection; import java.net.URI; import java.util.jar.*; import java.util.logging.Level; import java.util.logging.Logger; import java.util.zip.ZipEntry; import java.nio.channels.ReadableByteChannel; import java.nio.channels.Channels; import java.nio.channels.WritableByteChannel; import java.nio.ByteBuffer; /** * A utility class to help reading/writing content of JarFile from/to stream. * * @author Sanjeeb.Sahoo@Sun.COM */ public class JarHelper { private static final Logger logger = Logger.getLogger( JarHelper.class.getPackage().getName()); public static interface Visitor { void visit(JarEntry je); } public static void accept(JarInputStream jis, Visitor visitor) throws IOException { JarEntry je; while ((je = jis.getNextJarEntry()) != null) { logger.logp(Level.FINE, "JarHelper", "accept", "je = ${0}", new Object[]{je}); visitor.visit(je); } } /** * A utility method which reads contents from a URLConnection and * writes it out a Jar output stream. It reads everything except manifest * from the input. Closing of output stream is caller's responsibility. * * @param con URLConnection to be used as input * @param os Output stream to write to * @param m Manifest to be written out - can't be null * @throws IOException */ public static void write(URLConnection con, OutputStream os, Manifest m) { try { InputStream in = con.getInputStream(); JarInputStream jis = null; JarOutputStream jos = null; try { // We can assume the underlying stream is a JarInputStream. jis = new JarInputStream(in); jos = new JarOutputStream(os, m); write(jis, jos); } finally { try { if (jos != null) { jos.close(); } } catch (IOException ioe) { } try { if (jis != null) { jis.close(); } } catch (IOException ioe) { } try { in.close(); } catch (IOException ioe) { } } } catch (IOException ioe) { throw new RuntimeException(ioe); } } /** * A utility method to help write content of a Jar input stream * to a Jar output stream. It reads everything except manifest from * the supplied InputStream. Closing of streams is caller's responsibility. * * @param jis input stream to read from * @param jos output stream to write to * @throws IOException */ public static void write(JarInputStream jis, JarOutputStream jos) throws IOException { // Copy each entry from input to output // The manifest.mf is automatically excluded, // as JarInputStream.getNextEntry never returns that. ByteBuffer byteBuffer = ByteBuffer.allocate(10240); ZipEntry ze; while ((ze = jis.getNextEntry()) != null) { logger.logp(Level.FINE, "JarHelper", "write", "ze = {0}", new Object[]{ze}); jos.putNextEntry(ze); copy(jis, jos, byteBuffer); jos.closeEntry(); } } /** * A utility method to make a JarInputStream out of the contents of a directory. * It uses a Pipe and a separate thread to write the contents to avoid deadlock. * It accepts a Runnable to take action once the spwaned thread has finished writing. * It can be used to delete the directory. * * @param dir Directory which contains the exploded bits * @param action A runnable to be called after output has been written * @return a InputStream */ public static InputStream makeJar(final File dir, final Runnable action) throws IOException { final PipedOutputStream pos = new PipedOutputStream(); final PipedInputStream pis = new PipedInputStream(pos); new Thread() { @Override public void run() { try { Manifest m; File mf = new File(dir, JarFile.MANIFEST_NAME); if (mf.exists()) { FileInputStream mfis = new FileInputStream(mf); try { m = new Manifest(mfis); } finally { mfis.close(); } } else { m = new Manifest(); m.getMainAttributes().putValue(Attributes.Name.MANIFEST_VERSION.toString(), "1.0"); } final JarOutputStream jos = new JarOutputStream(pos, m); final ByteBuffer buf = ByteBuffer.allocate(10240); final URI baseURI = dir.toURI(); // System.out.println("baseURI = " + baseURI); dir.listFiles(new FileFilter() { public boolean accept(File f) { try { URI entryURI = f.toURI(); // System.out.println("entryURI = " + entryURI); String entryPath = baseURI.relativize(entryURI).getPath(); // System.out.println("entryPath = " + entryPath); if (entryPath.equals(JarFile.MANIFEST_NAME)) return false; jos.putNextEntry(new JarEntry(entryPath)); if (f.isDirectory()) { f.listFiles(this); // recursion } else { FileInputStream in = new FileInputStream(f); try { copy(in, jos, buf); } finally { try { in.close(); } catch (IOException e) { // ignore } } } jos.closeEntry(); } catch (IOException e) { logger.logp(Level.WARNING, "JarHelper", "makeJar", "Exception occurred", e); throw new RuntimeException(e); // TODO(Sahoo): Proper Exception Handling } return false; } }); jos.close(); pos.close(); if (action != null) { action.run(); } } catch (IOException e) { throw new RuntimeException(e); // TODO(Sahoo): Proper Exception Handling } } }.start(); return pis; } /** * Copies input to output. To avoid unnecessary allocation of byte buffers, * this method takes a byte buffer as argument. It clears the byte buffer * at the end of the operation. * @param in * @param out * @param byteBuffer */ public static void copy(InputStream in, OutputStream out, ByteBuffer byteBuffer) throws IOException{ try { ReadableByteChannel inChannel = Channels.newChannel(in); WritableByteChannel outChannel = Channels.newChannel(out); int read; do { read = inChannel.read(byteBuffer); if (read>0) { byteBuffer.limit(byteBuffer.position()); byteBuffer.rewind(); int written = 0; while((written += outChannel.write(byteBuffer)) < read) {} logger.logp(Level.FINE, "JarHelper", "write", "Copied {0} bytes", new Object[]{read}); byteBuffer.clear(); } } while (read != -1); } finally { byteBuffer.clear(); } } } Other Glassfish examples (source code examples)Here is a short list of links related to this Glassfish JarHelper.java source code file: |
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