/**

  * 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.routemodule.service.impl;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.api.reflect.ObjectDefinition;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 import org.kuali.rice.kew.actionrequest.ActionRequestValue;

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

 import org.kuali.rice.kew.api.exception.ResourceUnavailableException;

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

 import org.kuali.rice.kew.role.RoleRouteModule;

 import org.kuali.rice.kew.routemodule.FlexRMAdapter;

 import org.kuali.rice.kew.routemodule.RouteModule;

 import org.kuali.rice.kew.routemodule.service.RouteModuleService;

 import org.kuali.rice.kew.api.KewApiConstants;

 import org.springframework.beans.BeansException;

 import org.springframework.beans.factory.BeanFactory;

 import org.springframework.beans.factory.BeanFactoryAware;

 /**

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

  */

 public class RouteModuleServiceImpl implements RouteModuleService, BeanFactoryAware {

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

     private BeanFactory beanFactory;

     private String rulesEngineRouteModuleId;

     private RouteModule peopleFlowRouteModule;

     private volatile RouteModule rulesEngineRouteModule;

     public RouteModule findRouteModule(RouteNode node) throws ResourceUnavailableException {

         String routeMethodName = node.getRouteMethodName();

         LOG.debug("Finding route module for routeMethodName="+routeMethodName+" at route level "+node.getRouteNodeName());

         RouteModule routeModule = null;

         // default to FlexRM module if the routeMethodName is null

         if (node.isRulesEngineNode()) {

             routeModule = getRulesEngineRouteModule();

         } else if (node.isPeopleFlowNode()) {

             routeModule = getPeopleFlowRouteModule();

         } else if (routeMethodName == null || node.isFlexRM()) {

             routeModule = getFlexRMRouteModule(routeMethodName);

         } else {

             routeModule = getRouteModule(routeMethodName);

         }

         return routeModule;

     }

     public RouteModule findRouteModule(ActionRequestValue actionRequest) throws ResourceUnavailableException {

             if (!actionRequest.getResolveResponsibility()) {

                     return new RoleRouteModule();

             }

         if (actionRequest.getNodeInstance() == null) {

             return null;

         }

         return findRouteModule(actionRequest.getNodeInstance().getRouteNode());

     }

     private RouteModule getRouteModule(String routeMethodName) throws ResourceUnavailableException {

         if (routeMethodName == null) {

             return null;

         } else if ("".equals(routeMethodName.trim()) || KewApiConstants.ROUTE_LEVEL_NO_ROUTE_MODULE.equals(routeMethodName)) {

                 return null;

         }

         Object routeModule = GlobalResourceLoader.getObject(new ObjectDefinition(routeMethodName));//SpringServiceLocator.getExtensionService().getRouteModule(routeMethodName);

         if (routeModule instanceof RouteModule) {

             return (RouteModule)routeModule;

         }

         throw new WorkflowRuntimeException("Could not locate the Route Module with the given name: " + routeMethodName);

     }

     private RouteModule getFlexRMRouteModule(String ruleTemplateName) {

         return new FlexRMAdapter();

     }

     public void setPeopleFlowRouteModule(RouteModule peopleFlowRouteModule) {

         this.peopleFlowRouteModule = peopleFlowRouteModule;

     }

     public RouteModule getPeopleFlowRouteModule() {

         return peopleFlowRouteModule;

     }

     public String getRulesEngineRouteModuleId() {

         return rulesEngineRouteModuleId;

     }

     public void setRulesEngineRouteModuleId(String rulesEngineRouteModuleId) {

         this.rulesEngineRouteModuleId = rulesEngineRouteModuleId;

     }

     @Override

     public void setBeanFactory(BeanFactory beanFactory) throws BeansException {

         this.beanFactory = beanFactory;

     }

     /**

      * Loaded lazily by id so as not to introduce a runtime dependency on KRMS when it is not in use.

      */

     protected RouteModule getRulesEngineRouteModule() {

         if (rulesEngineRouteModule == null) {

             // this should initialize the route module in spring

             rulesEngineRouteModule = (RouteModule)beanFactory.getBean(getRulesEngineRouteModuleId());

         }

         return rulesEngineRouteModule;

     }

 }