/*

  * Copyright 2006-2011 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.kns.config;

 import java.util.HashSet;

 import java.util.Set;

 import org.kuali.rice.core.api.config.ConfigurationException;

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

 import org.springframework.beans.factory.FactoryBean;

 import org.springframework.beans.factory.InitializingBean;

 /**

  * Exports services in the {@link org.kuali.rice.core.api.resourceloader.GlobalResourceLoader} as beans available to Spring.

  * 

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

  *

  */

 public class GlobalResourceLoaderServiceFactoryBean implements FactoryBean<Object>, InitializingBean {

         private String serviceName;

         private boolean singleton;

         private boolean mustExist;

         // used to prevent a stack overflow when trying to get the service

         private boolean isFetchingService = false;

         public GlobalResourceLoaderServiceFactoryBean() {

                 this.mustExist = true;

         }

         public Object getObject() throws Exception {

                 if (isFetchingService) return null; // we already have been invoked, don't recurse, just return null.

                 isFetchingService = true;

                 try {

                         Object service = GlobalResourceLoader.getService(this.getServiceName());

                         if (mustExist && service == null) {

                                 throw new IllegalStateException("Service must exist and no service could be located with name: " + this.getServiceName());

                         }

                         return service;

                 } finally {

                         isFetchingService = false;

                 }

         }

         public Class<?> getObjectType() {

                 return Object.class;

         }

         public boolean isSingleton() {

                 return singleton;

         }

         public String getServiceName() {

                 return serviceName;

         }

         public void setServiceName(String serviceName) {

                 this.serviceName = serviceName;

         }

         public void setSingleton(boolean singleton) {

                 this.singleton = singleton;

         }

         public boolean isMustExist() {

                 return mustExist;

         }

         public void setMustExist(boolean mustExist) {

                 this.mustExist = mustExist;

         }

         public void afterPropertiesSet() throws Exception {

                 if (this.getServiceName() == null) {

                         throw new ConfigurationException("No serviceName given.");

                 }

         }

 }