/*

  * 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.ken.util;

 import java.util.ArrayList;

 import java.util.List;

 import org.w3c.dom.ls.LSInput;

 import org.w3c.dom.ls.LSResourceResolver;

 /**

  * LSResourceResolver implementation that delegates in sequence to a list of LSResourceResolvers,

  * returning the first match. 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class CompoundLSResourceResolver implements LSResourceResolver {

     private final List<LSResourceResolver> resolvers;

     /**

      * Constructs a CompoundLSResourceResolver.java.

      * @param first

      * @param second

      */

     public CompoundLSResourceResolver(LSResourceResolver first, LSResourceResolver second) {

         this.resolvers = new ArrayList<LSResourceResolver>(2);

         this.resolvers.add(first);

         this.resolvers.add(second);

     }

     /**

      * Constructs a CompoundLSResourceResolver.java.

      * @param resolvers

      */

     public CompoundLSResourceResolver(List<LSResourceResolver> resolvers) {

         this.resolvers = resolvers;

     }

     /**

      * @see org.w3c.dom.ls.LSResourceResolver#resolveResource(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String)

      */

     public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {

         for (LSResourceResolver resolver: resolvers) {

             LSInput input = resolver.resolveResource(type, namespaceURI, publicId, systemId, baseURI);

             if (input != null) {

                 return input;

             }

         }

         return null;

     }

 }