org.glassfish.web.osgi.JarHelper Maven / Gradle / Ivy
The newest version!
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2009 Sun Microsystems, Inc. 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.html
* or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [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.web.osgi;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLConnection;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import java.util.jar.JarEntry;
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 [email protected]
*/
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, "JarWriterImpl", "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, "JarWriterImpl", "write", "ze = {0}", new Object[]{ze});
jos.putNextEntry(ze);
copy(jis, jos, byteBuffer);
jos.closeEntry();
}
}
/**
* 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
*/
private 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();
outChannel.write(byteBuffer);
logger.logp(Level.FINE, "JarHelper", "write",
"Copied {0} bytes", new Object[]{read});
byteBuffer.clear();
}
} while (read != -1);
} finally {
byteBuffer.clear();
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy