/*

  * Copyright 2005-2008 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.kew.xml.export;

 import java.io.StringReader;

 import java.util.Iterator;

 import org.jdom.Document;

 import org.jdom.Element;

 import org.jdom.input.SAXBuilder;

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

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

 import org.kuali.rice.kew.rule.bo.RuleAttribute;

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

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

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

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

 /**

  * Exports {@link RuleAttribute}s to XML.

  * 

  * @see RuleAttribute

  *

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

  */

 public class RuleAttributeXmlExporter implements XmlExporter, XmlConstants {

     protected final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(getClass());

     private XmlRenderer renderer = new XmlRenderer(RULE_ATTRIBUTE_NAMESPACE);

     public Element export(ExportDataSet dataSet) {

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

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

             rootElement.setAttribute(SCHEMA_LOCATION_ATTR, RULE_ATTRIBUTE_SCHEMA_LOCATION, SCHEMA_NAMESPACE);

             for (Iterator iterator = dataSet.getRuleAttributes().iterator(); iterator.hasNext();) {

                 RuleAttribute template = (RuleAttribute)iterator.next();

                 exportRuleAttribute(rootElement, template);

             }

             return rootElement;

         }

         return null;

     }

     private void exportRuleAttribute(Element parent, RuleAttribute ruleAttribute) {

         Element attributeElement = renderer.renderElement(parent, RULE_ATTRIBUTE);

         renderer.renderTextElement(attributeElement, NAME, ruleAttribute.getName());

         renderer.renderTextElement(attributeElement, CLASS_NAME, ruleAttribute.getClassName());

         renderer.renderTextElement(attributeElement, LABEL, ruleAttribute.getLabel());

         renderer.renderTextElement(attributeElement, DESCRIPTION, ruleAttribute.getDescription());

         renderer.renderTextElement(attributeElement, TYPE, ruleAttribute.getType());

         renderer.renderTextElement(attributeElement, SERVICE_NAMESPACE, ruleAttribute.getServiceNamespace());

         if (!Utilities.isEmpty(ruleAttribute.getXmlConfigData())) {

             try {

                 Document configDoc = new SAXBuilder().build(new StringReader(ruleAttribute.getXmlConfigData()));

                 XmlHelper.propogateNamespace(configDoc.getRootElement(), RULE_ATTRIBUTE_NAMESPACE);

                 attributeElement.addContent(configDoc.getRootElement().detach());

             } catch (Exception e) {

                     LOG.error("Error parsing attribute XML configuration.", e);

                 throw new WorkflowRuntimeException("Error parsing attribute XML configuration.");

             }

         }

     }

 }