001    /**
002     * Copyright 2005-2014 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.ken.util;
017    
018    import java.util.ArrayList;
019    import java.util.List;
020    
021    import org.w3c.dom.ls.LSInput;
022    import org.w3c.dom.ls.LSResourceResolver;
023    
024    /**
025     * LSResourceResolver implementation that delegates in sequence to a list of LSResourceResolvers,
026     * returning the first match. 
027     * @author Kuali Rice Team (rice.collab@kuali.org)
028     */
029    public class CompoundLSResourceResolver implements LSResourceResolver {
030        private final List<LSResourceResolver> resolvers;
031    
032        /**
033         * Constructs a CompoundLSResourceResolver.java.
034         * @param first
035         * @param second
036         */
037        public CompoundLSResourceResolver(LSResourceResolver first, LSResourceResolver second) {
038            this.resolvers = new ArrayList<LSResourceResolver>(2);
039            this.resolvers.add(first);
040            this.resolvers.add(second);
041        }
042    
043        /**
044         * Constructs a CompoundLSResourceResolver.java.
045         * @param resolvers
046         */
047        public CompoundLSResourceResolver(List<LSResourceResolver> resolvers) {
048            this.resolvers = resolvers;
049        }
050    
051        /**
052         * @see org.w3c.dom.ls.LSResourceResolver#resolveResource(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String)
053         */
054        public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {
055            for (LSResourceResolver resolver: resolvers) {
056                LSInput input = resolver.resolveResource(type, namespaceURI, publicId, systemId, baseURI);
057                if (input != null) {
058                    return input;
059                }
060            }
061            return null;
062        }
063    }