openjpa-persistence/src/main/java/org/apache/openjpa/persistence/osgi/BundleDelegatingClassLoader.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 WARRANTIESOR 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.openjpa.persistence.osgi;

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

import org.osgi.framework.Bundle;

/**
 * This is a simple ClassLoader that delegates to the Bundle
 * and is used by the PersistenceUnitInfo
 *
 * @version $Rev$ $Date$
 */
public class BundleDelegatingClassLoader extends ClassLoader {

  private final Bundle bundle;
  
  public BundleDelegatingClassLoader(Bundle b) {
    bundle = b;
  }
  
  @Override
  protected Class<?> findClass(String className) throws ClassNotFoundException {
    return bundle.loadClass(className);
  }

  @Override
  protected URL findResource(String resName) {
    return bundle.getResource(resName);
  }

  @SuppressWarnings("unchecked")
  @Override
  protected Enumeration<URL> findResources(String resName) throws IOException {
    return bundle.getResources(resName);
  }

}