/*

  * Copyright 2007-2008 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.mail;

 import javax.xml.transform.Templates;

 import javax.xml.transform.TransformerException;

 import javax.xml.transform.dom.DOMResult;

 import javax.xml.transform.dom.DOMSource;

 import javax.xml.xpath.XPath;

 import javax.xml.xpath.XPathConstants;

 import javax.xml.xpath.XPathExpressionException;

 import javax.xml.xpath.XPathFactory;

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

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

 import org.w3c.dom.Document;

 import org.w3c.dom.Node;

 /**

  * A class which has some convenience methods for handling Emails and stylesheets. 

  * 

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

  *

  */

 public class EmailStyleHelper {

     private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(EmailStyleHelper.class);

     public EmailContent generateEmailContent(Templates style, Document document) {

         DOMResult result = new DOMResult();

         if (LOG.isDebugEnabled()) {

             LOG.debug("Input document: " + XmlHelper.jotNode(document.getDocumentElement(), true));

         }

         try {

             style.newTransformer().transform(new DOMSource(document), result);

         } catch (TransformerException te) {

             String message = "Error transforming immediate reminder DOM";

             LOG.error(message, te);

             throw new WorkflowRuntimeException(message, te);

         }

         Node node = result.getNode();

         if (LOG.isDebugEnabled()) {

             LOG.debug("Email document: " + XmlHelper.jotNode(document));

         }

         XPathFactory xpf = XPathFactory.newInstance();

         XPath xpath = xpf.newXPath();

         try {

             String subject = (String) xpath.evaluate("/email/subject", node, XPathConstants.STRING);

             String body = (String) xpath.evaluate("/email/body", node, XPathConstants.STRING);

             // simple heuristic to determine whether content is HTML

             return new EmailContent(subject, body, body.matches("(?msi).*<(\\w+:)?html.*"));

         } catch (XPathExpressionException xpee) {

             throw new WorkflowRuntimeException("Error evaluating generated email content", xpee);

         }

     }

 }