/*

  * 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);

     }

 }