/*

  * Copyright 2005-2007 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.kew.xml.export;

 import java.io.StringReader;

 import java.util.Iterator;

 import org.apache.log4j.Logger;

 import org.jdom.Element;

 import org.kuali.rice.kew.edl.bo.EDocLiteStyle;

 import org.kuali.rice.kew.exception.InvalidXmlException;

 import org.kuali.rice.kew.export.ExportDataSet;

 import org.kuali.rice.kew.util.XmlHelper;

 import org.kuali.rice.kew.xml.XmlConstants;

 import org.kuali.rice.kew.xml.XmlRenderer;

 /**

  * Exports Style definitions to XML.

  *

  * @see org.kuali.rice.kew.edl.service.StyleService

  * @see org.kuali.rice.kew.xml.StyleXmlParser

  * @see EDocLiteStyle

  *

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

  */

 public class StyleXmlExporter implements XmlExporter, XmlConstants {

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

         private XmlRenderer renderer = new XmlRenderer(STYLE_NAMESPACE);

         public Element export(ExportDataSet dataSet) {

                 if (!dataSet.getStyles().isEmpty()) {

                         Element rootElement = renderer.renderElement(null, STYLE_STYLES);

                         rootElement.setAttribute(SCHEMA_LOCATION_ATTR, STYLE_SCHEMA_LOCATION, SCHEMA_NAMESPACE);

                         for (Iterator iter = dataSet.getStyles().iterator(); iter.hasNext();) {

                                 EDocLiteStyle edocLite = (EDocLiteStyle) iter.next();

                                 exportStyle(rootElement, edocLite);

                         }

                         return rootElement;

                 }

                 return null;

         }

         private void exportStyle(Element parentEl, EDocLiteStyle style) {

         if (style == null) {

             LOG.error("Attempted to export style which was not found");

             return;

         }

         Element styleWrapperEl = renderer.renderElement(parentEl, STYLE_STYLE);

         renderer.renderAttribute(styleWrapperEl, "name", style.getName());

         try {

             Element styleEl = XmlHelper.buildJDocument(new StringReader(style.getXmlContent())).getRootElement();

             styleWrapperEl.addContent(styleEl.detach());

                 } catch (InvalidXmlException e) {

                         throw new RuntimeException("Error building JDom document for style", e);

                 }

         }        

 }