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/*******************************************************************************
* Copyright (c) 2008, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.composite;
import java.io.IOException;
import java.net.URL;
import java.security.ProtectionDomain;
import java.util.*;
import org.eclipse.osgi.baseadaptor.BaseData;
import org.eclipse.osgi.baseadaptor.bundlefile.BundleEntry;
import org.eclipse.osgi.baseadaptor.bundlefile.BundleFile;
import org.eclipse.osgi.baseadaptor.loader.*;
import org.eclipse.osgi.framework.adaptor.BundleData;
import org.eclipse.osgi.framework.adaptor.ClassLoaderDelegate;
import org.osgi.framework.Bundle;
public class CompositeClassLoader extends ClassLoader implements BaseClassLoader {
private final ClassLoaderDelegate delegate;
private final ClasspathManager manager;
private final ClassLoaderDelegate companionDelegate;
//Support to cut class / resource loading cycles in the context of one thread. The contained object is a set of classname
private final ThreadLocal beingLoaded = new ThreadLocal();
public CompositeClassLoader(ClassLoader parent, ClassLoaderDelegate delegate, ClassLoaderDelegate companionDelegate, BaseData data) {
super(parent);
this.delegate = delegate;
this.manager = new ClasspathManager(data, new String[0], this);
this.companionDelegate = companionDelegate;
}
public ClasspathEntry createClassPathEntry(BundleFile bundlefile, ProtectionDomain cpDomain) {
// nothing
return null;
}
public Class defineClass(String name, byte[] classbytes, ClasspathEntry classpathEntry, BundleEntry entry) {
// nothing
return null;
}
public ClasspathManager getClasspathManager() {
return manager;
}
public ProtectionDomain getDomain() {
// no domain
return null;
}
public Object publicDefinePackage(String name, String specTitle, String specVersion, String specVendor, String implTitle, String implVersion, String implVendor, URL sealBase) {
return definePackage(name, specTitle, specVersion, specVendor, implTitle, implVersion, implVendor, sealBase);
}
public Class publicFindLoaded(String classname) {
return findLoadedClass(classname);
}
public Object publicGetPackage(String pkgname) {
return getPackage(pkgname);
}
public void attachFragment(BundleData bundledata, ProtectionDomain domain, String[] classpath) {
// nothing
}
public void close() {
// nothing
}
public Class findLocalClass(String classname) throws ClassNotFoundException {
if (!startLoading(classname))
throw new ClassNotFoundException(classname);
try {
return companionDelegate.findClass(classname);
} finally {
stopLoading(classname);
}
}
public URL findLocalResource(String resource) {
if (!startLoading(resource))
return null;
try {
return companionDelegate.findResource(resource);
} finally {
stopLoading(resource);
}
}
public Enumeration findLocalResources(String resource) {
if (!startLoading(resource))
return null;
try {
return companionDelegate.findResources(resource);
} catch (IOException e) {
return null;
} finally {
stopLoading(resource);
}
}
public ClassLoaderDelegate getDelegate() {
return delegate;
}
public URL getResource(String name) {
return delegate.findResource(name);
}
public void initialize() {
manager.initialize();
}
public Class loadClass(String name) throws ClassNotFoundException {
return delegate.findClass(name);
}
private boolean startLoading(String name) {
Set classesAndResources = (Set) beingLoaded.get();
if (classesAndResources != null && classesAndResources.contains(name))
return false;
if (classesAndResources == null) {
classesAndResources = new HashSet(3);
beingLoaded.set(classesAndResources);
}
classesAndResources.add(name);
return true;
}
private void stopLoading(String name) {
((Set) beingLoaded.get()).remove(name);
}
public Bundle getBundle() {
return manager.getBaseData().getBundle();
}
@SuppressWarnings("unchecked")
public List<URL> findEntries(String path, String filePattern, int options) {
return Collections.EMPTY_LIST;
}
@SuppressWarnings("unchecked")
public Collection<String> listResources(String path, String filePattern, int options) {
return Collections.EMPTY_LIST;
}
@SuppressWarnings("unchecked")
public Collection<String> listLocalResources(String path, String filePattern, int options) {
return Collections.EMPTY_LIST;
}
}
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