/*

  * 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.Reader;

 import java.io.StringReader;

 import javax.xml.XMLConstants;

 import javax.xml.parsers.DocumentBuilder;

 import javax.xml.parsers.DocumentBuilderFactory;

 import org.kuali.rice.ken.bo.NotificationContentType;

 import org.kuali.rice.ken.service.NotificationContentTypeService;

 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 in NotificationContentType record.

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

  */

 public class ContentTypeLSResourceResolver extends ContentTypeResourceResolver implements LSResourceResolver {

     /**

      * Constructs a ContentTypeLSResourceResolver.java.

      * @param notificationContentTypeService

      */

     public ContentTypeLSResourceResolver(NotificationContentTypeService notificationContentTypeService) {

         super(notificationContentTypeService);

     }

     /**

      * @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;

         }

         if (!systemId.startsWith(CONTENT_TYPE_PREFIX)) {

             LOG.warn("Cannot resolve non-ContentType resources");

             return null;

         }

         NotificationContentType notificationContentType = resolveContentType(systemId);

         if (notificationContentType == null) {

             LOG.error("Unable to resolve system id '" + systemId + "' locally...delegating to default resolution strategy.");

             return null;

         }

         Reader reader = new StringReader(notificationContentType.getXsd());

         try {

             DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

             DocumentBuilder builder = factory.newDocumentBuilder();

             DOMImplementation domImpl = builder.getDOMImplementation();

             DOMImplementationLS dils = (DOMImplementationLS) domImpl;

             LSInput input = dils.createLSInput();

             input.setCharacterStream(reader);

             return input;

         } catch (Exception e) {

             throw new RuntimeException(e);

         }

     }

 }