/
ShrinkWrapClassLoader.java
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/
ShrinkWrapClassLoader.java
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/*
* JBoss, Home of Professional Open Source
* Copyright 2009, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.shrinkwrap.api.classloader;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.ArchivePath;
import org.jboss.shrinkwrap.api.ArchivePaths;
/**
* Extension that will create a ClassLoader based on a Array of Archives.
* When done, call {@link ShrinkWrapClassLoader#close()} to free resources.
*
* @author <a href="mailto:aslak@redhat.com">Aslak Knutsen</a>
* @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a>
*/
public class ShrinkWrapClassLoader extends URLClassLoader implements Closeable
{
//-------------------------------------------------------------------------------------||
// Class Members ----------------------------------------------------------------------||
//-------------------------------------------------------------------------------------||
/**
* Logger
*/
private static final Logger log = Logger.getLogger(ShrinkWrapClassLoader.class.getName());
//-------------------------------------------------------------------------------------||
// Instance Members -------------------------------------------------------------------||
//-------------------------------------------------------------------------------------||
/**
* List of all streams opened, such that they may be closed in {@link ShrinkWrapClassLoader#close()}.
* Guarded by "this".
*/
private final List<InputStream> openedStreams = new ArrayList<InputStream>();
//-------------------------------------------------------------------------------------||
// Constructors -----------------------------------------------------------------------||
//-------------------------------------------------------------------------------------||
/**
* Constructs a new ShrinkWrapClassLoader for the specified {@link Archive}s using the
* default delegation parent <code>ClassLoader</code>. The {@link Archive}s will
* be searched in the order specified for classes and resources after
* first searching in the parent class loader.
*
* @param archives the {@link Archive}s from which to load classes and resources
*/
public ShrinkWrapClassLoader(final Archive<?>... archives)
{
super(new URL[]{});
if (archives == null)
{
throw new IllegalArgumentException("Archives must be specified");
}
addArchives(archives);
}
/**
* Constructs a new ShrinkWrapClassLoader for the given {@link Archive}s. The {@link Archive}s will be
* searched in the order specified for classes and resources after first
* searching in the specified parent class loader.
*
* @param parent the parent class loader for delegation
* @param archives the {@link Archive}s from which to load classes and resources
*/
public ShrinkWrapClassLoader(final ClassLoader parent, final Archive<?>... archives)
{
super(new URL[]{}, parent);
if (archives == null)
{
throw new IllegalArgumentException("Archives must be specified");
}
addArchives(archives);
}
private void addArchives(final Archive<?>[] archives)
{
for (final Archive<?> archive : archives)
{
addArchive(archive);
}
}
private void addArchive(final Archive<?> archive)
{
try
{
addURL(new URL(null, "archive:" + archive.getName() + "/", new URLStreamHandler()
{
@Override
protected URLConnection openConnection(final URL u) throws IOException
{
return new URLConnection(u)
{
@Override
public void connect() throws IOException
{
}
@Override
public InputStream getInputStream() throws IOException
{
synchronized (this)
{
ArchivePath path = convertToArchivePath(u);
InputStream input = archive.get(path).getAsset().openStream();
openedStreams.add(input);
return input;
}
}
private ArchivePath convertToArchivePath(URL url)
{
String path = url.getPath();
path = path.replace(archive.getName(), "");
return ArchivePaths.create(path);
}
};
}
}));
}
catch (Exception e)
{
throw new RuntimeException("Could not create URL for archive: " + archive.getName(), e);
}
}
public void close() throws IOException
{
synchronized (this)
{
for (InputStream stream : openedStreams)
{
try
{
stream.close();
}
catch (Exception e)
{
log.warning("Could not close opened inputstream: " + e);
}
}
openedStreams.clear();
}
}
}