/*

  * Copyright 2007-2010 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.xml.schema;

 import java.io.InputStream;

 import javax.xml.parsers.DocumentBuilder;

 import javax.xml.parsers.DocumentBuilderFactory;

 import org.kuali.rice.core.util.RiceUtilities;

 import org.w3c.dom.DOMImplementation;

 import org.w3c.dom.ls.DOMImplementationLS;

 import org.w3c.dom.ls.LSInput;

 import org.w3c.dom.ls.LSResourceResolver;

 /**

  * This is an entity resolver for loading schemas.

  * It finds resources in the impl/src/main/resources/schema directory.

  * 

  * TODO:  Handle schemas that are formally published

  * 

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

  *

  */

 public class SchemaLSResourceResolver implements LSResourceResolver {

         private static final String SCHEMA_DIR = "classpath:schema/";

         /**

          * This overridden method currently looks for resources in the "classpath:schema/" directory.

          * 

          * @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) {

                 LSInput input = null;

                 try{

                         InputStream xsdFile = RiceUtilities.getResourceAsStream(SCHEMA_DIR + systemId);

                         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

                         DocumentBuilder builder = factory.newDocumentBuilder();

                         DOMImplementation domImpl = builder.getDOMImplementation();

                         DOMImplementationLS dils = (DOMImplementationLS) domImpl;

                         input = dils.createLSInput();

                         input.setByteStream(xsdFile);

                 } catch (Exception e) {

                         throw new RuntimeException(e);

                 }

                 return input;

         }

 }