/**

  * Copyright 2005-2011 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.IOException;

 import java.io.StringReader;

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

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

 import org.xml.sax.EntityResolver;

 import org.xml.sax.InputSource;

 import org.xml.sax.SAXException;

 /**

  * Entity resolver that resolves content type XSD resources to XSDs define in

  * the respective content type's NotificationContentType record

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

  */

 public class ContentTypeEntityResolver extends ContentTypeResourceResolver implements EntityResolver {

     /**

      * Constructs a ContentTypeEntityResolver.java.

      * @param notificationContentTypeService

      */

     public ContentTypeEntityResolver(NotificationContentTypeService notificationContentTypeService) {

         super(notificationContentTypeService);

     }

     /**

      * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String)

      */

     public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {

         LOG.debug("Resolving '" + publicId + "' / '" + systemId + "'");

         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;

         }

         LOG.debug("Resolved '" + systemId + "' to " + notificationContentType.getXsd());

         return new InputSource(new StringReader(notificationContentType.getXsd()));

     }

     /**

      * @see java.lang.Object#toString()

      */

     public String toString() {

         return "[ContentTypeEntityResolver]";

     }

 }