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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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.apache.tuscany.common.resource.impl;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import org.apache.tuscany.common.resource.ResourceLoader;
/**
* Default implementation of the ResourceLoader interface
*
* @version $Rev: 369102 $ $Date: 2006-01-14 13:48:56 -0800 (Sat, 14 Jan 2006) $
*/
@SuppressWarnings({"ClassLoader2Instantiation"})
public class ResourceLoaderImpl implements ResourceLoader {
private final WeakReference<ClassLoader> classLoaderReference;
private WeakReference<GeneratedClassLoader> generatedClassLoaderReference;
private final List<ResourceLoader> parents;
/**
* Constructs a new ResourceLoaderImpl to wrap a ClassLoader.
*
* @param classLoader the classloader to wrap
*/
public ResourceLoaderImpl(ClassLoader classLoader) {
classLoaderReference = new WeakReference<ClassLoader>(classLoader);
generatedClassLoaderReference = new WeakReference<GeneratedClassLoader>(new GeneratedClassLoader(classLoader));
ClassLoader parentCL = classLoader.getParent();
if (null == parentCL) {
parents = Collections.emptyList();
} else {
parents = Collections.singletonList((ResourceLoader) new ResourceLoaderImpl(parentCL));
}
}
public ClassLoader getClassLoader() throws IllegalStateException {
ClassLoader cl = classLoaderReference.get();
if (cl == null) {
throw new IllegalStateException("Referenced ClassLoader has been garbage collected");
}
return cl;
}
public List<ResourceLoader> getParents() {
return parents;
}
public Class<?> loadClass(String name) throws ClassNotFoundException {
GeneratedClassLoader cl = generatedClassLoaderReference.get();
if (cl != null) {
return Class.forName(name, true, cl);
} else {
return Class.forName(name, true, getClassLoader());
}
}
public Class<?> addClass(byte[] bytes) {
GeneratedClassLoader cl = generatedClassLoaderReference.get();
if (cl == null) {
cl = new GeneratedClassLoader(getClassLoader());
generatedClassLoaderReference = new WeakReference<GeneratedClassLoader>(cl);
}
return cl.addClass(bytes);
}
public Iterator<URL> getResources(String name) throws IOException {
return new EnumerationIterator<URL>(getClassLoader().getResources(name));
}
public URL getResource(String name) {
return getClassLoader().getResource(name);
}
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ResourceLoaderImpl)) {
return false;
}
final ResourceLoaderImpl other = (ResourceLoaderImpl) obj;
return getClassLoader() == other.getClassLoader();
}
public int hashCode() {
return getClassLoader().hashCode();
}
private static class EnumerationIterator<E> implements Iterator<E> {
private final Enumeration<E> e;
public EnumerationIterator(Enumeration<E> e) {
this.e = e;
}
public boolean hasNext() {
return e.hasMoreElements();
}
public E next() {
// the try/catch is needed here to get IDEA to shut up
// there should be no performance overhead here except when the Exception is thrown
// so I am going to leave it in - feel free to remove if there is any issue
try {
return e.nextElement();
} catch (NoSuchElementException e1) {
throw e1;
}
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}
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