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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.FileNotFoundException;
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;
import org.jboss.shrinkwrap.api.Node;
import org.jboss.shrinkwrap.api.asset.Asset;
/**
* Extension that will create a ClassLoader based on a Array of Archives. When done, call
* {@link ShrinkWrapClassLoader#close()} to free resources.
*
* @author Aslak Knutsen
* @author ALR
*/
public class ShrinkWrapClassLoader extends URLClassLoader implements Closeable {
// -------------------------------------------------------------------------------------||
// Class Members ----------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Logger
*/
private static final Logger log = Logger.getLogger(ShrinkWrapClassLoader.class.getName());
/**
* Empty String
*/
private static final String EMPTY = "";
// -------------------------------------------------------------------------------------||
// Instance Members -------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* List of all streams opened, such that they may be closed in {@link ShrinkWrapClassLoader#close()}. Guarded by
* "this".
*/
private final List openedStreams = new ArrayList();
// -------------------------------------------------------------------------------------||
// Constructors -----------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Constructs a new ShrinkWrapClassLoader for the specified {@link Archive}s using the default delegation parent
* ClassLoader. 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 {
final ArchivePath path = convertToArchivePath(u);
final Node node = archive.get(path);
// SHRINKWRAP-308
if (node == null) {
// We've asked for a path that doesn't exist
throw new FileNotFoundException("Requested path: " + path + " does not exist in "
+ archive.toString());
}
final Asset asset = node.getAsset();
// SHRINKWRAP-306
if (asset == null) {
// This is a directory, so return null InputStream to denote as such
return null;
}
final InputStream input = asset.openStream();
synchronized (this) {
openedStreams.add(input);
}
return input;
}
private ArchivePath convertToArchivePath(URL url) {
String path = url.getPath();
path = path.replace(archive.getName(), EMPTY);
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();
}
}
}