/**

  * 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.core.impl.style;

 import java.io.StringReader;

 import javax.xml.transform.Source;

 import javax.xml.transform.URIResolver;

 import javax.xml.transform.stream.StreamSource;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.api.style.Style;

 import org.kuali.rice.core.api.style.StyleService;

 /**

  * A URIResolver that knows how to resolve href's based on style names.

  * 

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

  * 

  */

 class StyleUriResolver implements URIResolver {

         private static final Logger LOG = Logger.getLogger(StyleUriResolver.class);

         private final StyleService styleService;

         StyleUriResolver(StyleService styleService) {

                 if (styleService == null) {

                         throw new IllegalArgumentException("styleService cannot be null");

                 }

                 this.styleService = styleService;

         }

         public Source resolve(String href, String base) {

                 try {

                         Style style = styleService.getStyle(href);

                         return new StreamSource(new StringReader(style.getXmlContent()));

                 } catch (Exception e) {

                         LOG.error("Error ocurred getting style " + href, e);

                 }

                 return null;

         }

 }