examples/org.eclipse.ui.examples.di.js/src/org/eclipse/ui/internal/examples/di/js/BundleProxyClassLoader.java

package org.eclipse.ui.internal.examples.di.js;

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

import org.osgi.framework.Bundle;

public class BundleProxyClassLoader extends ClassLoader {
	private Bundle bundle;
	private ClassLoader parent;

	public BundleProxyClassLoader(Bundle bundle) {
		this.bundle = bundle;
	}

	public BundleProxyClassLoader(Bundle bundle, ClassLoader parent) {
		super(parent);
		this.parent = parent;
		this.bundle = bundle;
	}

	// Note: Both ClassLoader.getResources(...) and bundle.getResources(...)
	// consult
	// the boot classloader. As a result,
	// BundleProxyClassLoader.getResources(...)
	// might return duplicate results from the boot classloader. Prior to Java 5
	// Classloader.getResources was marked final. If your target environment
	// requires
	// at least Java 5 you can prevent the occurence of duplicate boot
	// classloader
	// resources by overriding ClassLoader.getResources(...) instead of
	// ClassLoader.findResources(...).
	public Enumeration findResources(String name) throws IOException {
		return bundle.getResources(name);
	}

	public URL findResource(String name) {
		return bundle.getResource(name);
	}

	public Class findClass(String name) throws ClassNotFoundException {
		return bundle.loadClass(name);
	}

	public URL getResource(String name) {
		return (parent == null) ? findResource(name) : super.getResource(name);
	}

	protected Class loadClass(String name, boolean resolve)
			throws ClassNotFoundException {
		Class clazz = (parent == null) ? findClass(name) : super.loadClass(
				name, false);
		if (resolve)
			super.resolveClass(clazz);

		return clazz;
	}
}