/*
    * 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.engine.node;
  
  import java.io.StringReader;
  
  import javax.xml.parsers.DocumentBuilder;
  import javax.xml.parsers.DocumentBuilderFactory;
  
  import org.apache.log4j.Level;
  import org.apache.log4j.Logger;
  import org.kuali.rice.kew.engine.RouteContext;
  import org.kuali.rice.kew.engine.RouteHelper;
  import org.kuali.rice.kew.engine.node.var.PropertyScheme;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  import org.w3c.dom.NodeList;
  import org.xml.sax.InputSource;
  
  
  /**
   * A node which Logs messages to Log4j.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class LogNode implements SimpleNode {
      private static final Logger LOG = Logger.getLogger(LogNode.class);
  
      public SimpleResult process(RouteContext context, RouteHelper helper) throws Exception {
          LOG.error("processing");
          DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
          String contentFragment = context.getNodeInstance().getRouteNode().getContentFragment();
          LOG.error("contentFragment=" + contentFragment);
          Document d = db.parse(new InputSource(new StringReader(contentFragment)));
          Element e = d.getDocumentElement();
          String name = null;
          NodeList list = e.getElementsByTagName("log");
          if (list != null && list.getLength() > 0) {
              name = list.item(0).getTextContent();
          }
          list = e.getElementsByTagName("level");
          String level = "info";
          if (list != null && list.getLength() > 0) {
              level = list.item(0).getTextContent().toLowerCase();
          }
          LOG.error("doc content: "+ context.getDocument().getDocContent());
          String valueRef = e.getElementsByTagName("message").item(0).getTextContent();
          Object retrievedVal = PropertiesUtil.retrieveProperty(valueRef, PropertyScheme.LITERAL_SCHEME, context);
          LOG.error("retrieved value '" + retrievedVal + " for message '" + valueRef);
          Logger l;
          if (name == null) {
              l = LOG;
          } else {
              l = Logger.getLogger(name);
          }
          l.log(Level.toLevel(level), retrievedVal);
          return new SimpleResult(true);
      }
  
  }