/*
    * Copyright 2007-2008 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.core.resourceloader;
  
  import java.util.List;
  
  import javax.xml.namespace.QName;
  
  import org.kuali.rice.core.reflect.ObjectDefinition;
  
  /**
   * This is a description of what this class does - ewestfal don't forget to fill this in.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   *
   */
  public class ParentChildResourceLoader extends BaseResourceLoader {
  
      private ResourceLoader parent;
      private ResourceLoader child;
  
      public ParentChildResourceLoader(ResourceLoader parent, ResourceLoader child) {
  	super(new QName(child.getName().toString() + " to parent " + parent.getName().toString()));
  	this.parent = parent;
  	this.child = child;
      }
  
      public Object getObject(ObjectDefinition definition) {
  	Object object = child.getObject(definition);
  	if (object == null) {
  	    object = parent.getObject(definition);
  	}
  	return object;
      }
  
      public Object getService(QName qname) {
  	Object service = child.getService(qname);
  	if (service == null) {
  	    service = parent.getService(qname);
  	}
  	return service;
      }
  
      public void start() throws Exception {
  	// just start the child, it will be assumed that parent will be started from it's context
  	if (!child.isStarted()) {
  	    child.start();
  	}
  	super.start();
      }
  
      public void stop() throws Exception {
  	child.stop();
  	super.stop();
      }
  
      public void addResourceLoader(ResourceLoader resourceLoader) {
  	this.child.addResourceLoader(resourceLoader);
      }
  
      public void addResourceLoaderFirst(ResourceLoader resourceLoader) {
  	this.child.addResourceLoaderFirst(resourceLoader);
      }
  
   
      public ResourceLoader getResourceLoader(QName name) {
      	ResourceLoader resourceLoader = this.child.getResourceLoader(name);
      	if (resourceLoader == null && parent != null) {
      		return parent.getResourceLoader(name);
      	} else {
      		return resourceLoader;
      	}
      }
    
      public List<QName> getResourceLoaderNames() {
  	return this.child.getResourceLoaderNames();
      }
  
      public List<ResourceLoader> getResourceLoaders() {
  	return this.child.getResourceLoaders();
      }
  
      public void removeResourceLoader(QName name) {
  	this.child.removeResourceLoader(name);
      }
  
 
 
 }