/*

  * 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.edl.impl;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.LinkedHashMap;

 import java.util.Map;

 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.w3c.dom.Element;

 import org.w3c.dom.Node;

 /**

  * Store global EDL config information parsed from config file.

  * 

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

  *

  */

 public class EDLGlobalConfig {

         private Map preProcessors = new HashMap();

         private Map postProcessors = new HashMap();

         private Map stateComponents = new HashMap();

         private Map configProcessors = new LinkedHashMap();

         public void addPreProcessor(String preProcessorName, Element element) {

                 try {

                         preProcessors.put(Class.forName(preProcessorName), element);        

                 } catch (ClassNotFoundException ce) {

                         throw new WorkflowRuntimeException("Class " + preProcessorName + " not found.", ce);

                 }

         }

         public void addPostProcessor(String postProcessorName, Element configElement) {

                 try {

                         postProcessors.put(Class.forName(postProcessorName), configElement);

                 } catch (ClassNotFoundException ce) {

                         throw new WorkflowRuntimeException("Class " + postProcessorName + " not found.", ce);

                 }

         }

         public void addStateComponent(String stateComponentName, Element configElement) {

                 try {

                         stateComponents.put(Class.forName(stateComponentName), configElement);

                 } catch (ClassNotFoundException ce) {

                         throw new WorkflowRuntimeException("Class " + stateComponentName + " not found.", ce);

                 }

         }

         public void addConfigProcessor(String xpathExpression, String configProcessorName) {

                 Class configProcessor;

                 try {

                         configProcessor = Class.forName(configProcessorName);

                 } catch (ClassNotFoundException ce) {

                         throw new WorkflowRuntimeException("Class " + configProcessorName + " not found.", ce);

                 }

                 if (configProcessors.containsKey(configProcessor)) {

                         throw new WorkflowRuntimeException("Config processor " + configProcessorName + " attempted to register an xpath expression twice.  " +

                                         "The expression being used is " + configProcessors.get(configProcessor));

                 } else {

                         configProcessors.put(configProcessor, xpathExpression);        

                 }

         }

         public Map getPreProcessors() {

                 return preProcessors;

         }

         public Map getPostProcessors() {

                 return postProcessors;

         }

         public Map getStateComponents() {

                 return stateComponents;

         }

         public Class getConfigProcessor(Node configElement) {

                 if (configElement instanceof Element) {

                         XPath xpath = XPathFactory.newInstance().newXPath();

                         String xpathExpression = "";

                         try {

                                 for (Iterator iter = configProcessors.entrySet().iterator(); iter.hasNext();) {

                                         Map.Entry configProcessor = (Map.Entry) iter.next();

                                         xpathExpression = (String) configProcessor.getKey();

                                         Boolean match = (Boolean) xpath.evaluate(xpathExpression, configElement, XPathConstants.BOOLEAN);

                                         if (match.booleanValue()) {

                                                 return (Class) configProcessor.getValue();

                                         }

                                 }

                                 return null;

                         } catch (XPathExpressionException e) {

                                 throw new WorkflowRuntimeException("Unable to evaluate xpath expression " + xpathExpression, e);

                         } catch (Exception ie) {

                                 throw new WorkflowRuntimeException(ie);

                         }

                 }

                 return null;

         }

         public Map getConfigProcessors() {

                 return configProcessors;

         }

         public void setConfigProcessors(Map configProcessors) {

                 this.configProcessors = configProcessors;

         }

         public void setPostProcessors(Map postProcessors) {

                 this.postProcessors = postProcessors;

         }

         public void setPreProcessors(Map preProcessors) {

                 this.preProcessors = preProcessors;

         }

         public void setStateComponents(Map stateComponents) {

                 this.stateComponents = stateComponents;

         }

 }