/**
    * Copyright 2005-2012 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 org.jdom.Document;
  import org.jdom.Element;
  import org.jdom.input.SAXBuilder;
  import org.kuali.rice.core.api.impex.ExportDataSet;
  import org.kuali.rice.core.api.util.xml.XmlHelper;
  import org.kuali.rice.core.api.util.xml.XmlRenderer;
  import org.kuali.rice.core.framework.impex.xml.XmlExporter;
  import org.kuali.rice.kew.api.WorkflowRuntimeException;
  import org.kuali.rice.kew.export.KewExportDataSet;
  import org.kuali.rice.kew.rule.bo.RuleAttribute;
  
  import java.io.StringReader;
  import java.util.Iterator;
  
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.*;
  
  /**
   * Exports {@link org.kuali.rice.kew.rule.bo.RuleAttribute}s to XML.
   * 
   * @see org.kuali.rice.kew.rule.bo.RuleAttribute
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class RuleAttributeXmlExporter implements XmlExporter {
  
      protected final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(getClass());
      
      private XmlRenderer renderer = new XmlRenderer(RULE_ATTRIBUTE_NAMESPACE);
      
  	@Override
  	public boolean supportPrettyPrint() {
  		return true;
  	}
  
      public Element export(ExportDataSet exportDataSet) {
      	KewExportDataSet dataSet = KewExportDataSet.fromExportDataSet(exportDataSet);
          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.getResourceDescriptor());
          renderer.renderTextElement(attributeElement, LABEL, ruleAttribute.getLabel());
          renderer.renderTextElement(attributeElement, DESCRIPTION, ruleAttribute.getDescription());
          renderer.renderTextElement(attributeElement, TYPE, ruleAttribute.getType());
          renderer.renderTextElement(attributeElement, APPLICATION_ID, ruleAttribute.getApplicationId());
          if (!org.apache.commons.lang.StringUtils.isEmpty(ruleAttribute.getXmlConfigData())) {
              try {
                  Document configDoc = new SAXBuilder().build(new StringReader(ruleAttribute.getXmlConfigData()));
                  XmlHelper.propagateNamespace(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.");
              }
          }
      }
      
  }