/**

  * Copyright 2005-2011 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.var;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.api.util.xml.XmlException;

 import org.kuali.rice.kew.engine.RouteContext;

 import org.kuali.rice.kew.engine.RouteHelper;

 import org.kuali.rice.kew.engine.node.BranchState;

 import org.kuali.rice.kew.engine.node.PropertiesUtil;

 import org.kuali.rice.kew.engine.node.SimpleNode;

 import org.kuali.rice.kew.engine.node.SimpleResult;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.w3c.dom.Document;

 import org.w3c.dom.Element;

 import org.xml.sax.InputSource;

 import javax.xml.parsers.DocumentBuilder;

 import javax.xml.parsers.DocumentBuilderFactory;

 import java.io.StringReader;

 /**

  * A simple node that allows setting of document variables.

  * The definition of SetVarNode takes the following config parameter elements:

  * <dl>

  *   <dt>name</dt>

  *   <dd>The name of the variable to set</dd>

  *   <dt>value</dt>

  *   <dd>The value to which to set the variable.  This value is parsed according to

  *       Property/PropertyScheme syntax</dd>

  * </dl>

  * The default PropertySchme is LiteralScheme, which will evaluate the value simply

  * as a literal (won't do anything but return it)

  * @see PropertyScheme

  * @see Property

  * 

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

  */

 public class SetVarNode implements SimpleNode {

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

     public SimpleResult process(RouteContext context, RouteHelper helper) throws Exception {

         LOG.debug("processing");

         DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();

         String contentFragment = context.getNodeInstance().getRouteNode().getContentFragment();

         LOG.debug("contentFragment=" + contentFragment);

         Document d = db.parse(new InputSource(new StringReader(contentFragment)));

         Element e = d.getDocumentElement();

         String name = e.getElementsByTagName("name").item(0).getTextContent();

         // FIXME: validation should be checked in documenttypexmlparser to start with

         if (name == null) {

             throw new XmlException("SetVar node required 'name' attribute to be specified");

         }

         String valueRef = e.getElementsByTagName("value").item(0).getTextContent();

         Object retrievedVal = PropertiesUtil.retrieveProperty(valueRef, PropertyScheme.LITERAL_SCHEME, context);

         LOG.debug("retrieved value '" + retrievedVal + " for value '" + valueRef);

         // hack to make variable value fit in column size

         // need to just alter that column

         String stringVal = null;

         if (retrievedVal != null) {

             stringVal = retrievedVal.toString();

             if (stringVal.length() > 255) {

                 stringVal = stringVal.substring(0, 255);

             }

         }

         LOG.debug("setting value '" + stringVal + "' for variable " + name);

         KEWServiceLocator.getBranchService().setScopedVariableValue(context.getNodeInstance().getBranch(), BranchState.VARIABLE_PREFIX + name, stringVal);

         return new SimpleResult(true);

     }

 }