/*

  * 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.io.InputStream;

 import javax.xml.XMLConstants;

 import javax.xml.parsers.DocumentBuilder;

 import javax.xml.parsers.DocumentBuilderFactory;

 import org.w3c.dom.DOMImplementation;

 import org.w3c.dom.ls.DOMImplementationLS;

 import org.w3c.dom.ls.LSInput;

 import org.w3c.dom.ls.LSResourceResolver;

 /**

  * Resource resolver for SchemaFactory.  For now used during validation of NotificationRequest content element.

  * Looks up XSD from classloader.

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

  */

 public class ClassLoaderLSResourceResolver extends ClassLoaderResourceResolver implements LSResourceResolver {

     /**

      * Constructs a ClassLoaderLSResourceResolver.java.

      * @param base

      * @param prefix

      */

     public ClassLoaderLSResourceResolver(String base, String prefix) {

         super(base, prefix);

     }

     /**

      * @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) {

         if (!type.equals(XMLConstants.W3C_XML_SCHEMA_NS_URI)) {

             return null;

         }

         LOG.error(type);

         LOG.error(namespaceURI);

         LOG.error(publicId);

         LOG.error(systemId);

         LOG.error(baseURI);

         String path = resolveSystemId(systemId);

         if (path == null) {

             return null;

         }

         LOG.debug("Looking up resource '" + path + "' for system id '" + systemId + "'");

         InputStream is = getClass().getClassLoader().getResourceAsStream(path);

         if (is == null) {

             String message = "Unable to find schema (" + path + ") for: " + systemId;

             LOG.error(message);

             throw new RuntimeException/*SAXException*/(message);

         }

         try {

             DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

             DocumentBuilder builder = factory.newDocumentBuilder();

             DOMImplementation domImpl = builder.getDOMImplementation();

             DOMImplementationLS dils = (DOMImplementationLS) domImpl;

             LSInput input = dils.createLSInput();

             input.setByteStream(is);

             return input;

         } catch (Exception e) {

             throw new RuntimeException(e);

         }

     }

 }