/**
    * 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;
  	}
  
  }