/*

  * 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.kim.service;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.api.config.module.RunMode;

 import org.kuali.rice.core.api.config.property.ConfigContext;

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

 import org.kuali.rice.kim.api.type.KimType;

 import org.kuali.rice.kim.api.type.KimTypeService;

 import org.kuali.rice.kim.api.type.KimTypeUtils;

 import org.kuali.rice.kim.util.KimConstants;

 import javax.xml.namespace.QName;

 public class KIMServiceLocatorWeb {

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

     public static final String KIM_RUN_MODE_PROPERTY = "kim.mode";

     public static Object getService(String serviceName) {

         return getBean(serviceName);

     }

     public static Object getBean(String serviceName) {

         if (LOG.isDebugEnabled()) {

             LOG.debug("Fetching service " + serviceName);

         }

         return GlobalResourceLoader.getResourceLoader().getService(

                 (RunMode.REMOTE.equals(RunMode.valueOf(ConfigContext.getCurrentContextConfig().getProperty(KIM_RUN_MODE_PROPERTY)))) ?

                         new QName(KimConstants.KIM_MODULE_NAMESPACE, serviceName) : new QName(serviceName));

     }

         /**

          * Fetches the KimTypeService for the given KimType  If the kimType passed in is null

          * then this method will return null.  This method will resolve the kimTypeServiceName

          * on the given KimType and then delegate to {@link #getKimTypeService(QName)}.

          */

         public static KimTypeService getKimTypeService(KimType kimType) {

                 if( kimType == null ) {

                         LOG.warn( "null KimType passed into getKimTypeService" );

                         return null;

                 }

                 return getKimTypeService(KimTypeUtils.resolveKimTypeServiceName(kimType.getServiceName()));

         }

         /**

          * Fetches the KimTypeService for the given kim type service name.  If the given {@link QName}

          * is null, then this method will throw an IllegalArgumentException.

          *

          * @throws IllegalArgumentException if the given kimTypeServiceName is null

          */

         public static KimTypeService getKimTypeService(QName kimTypeServiceName) {

                 if (kimTypeServiceName == null) {

                         throw new IllegalArgumentException("Invalid service name passed, value was null.");

                 }

                 try {

                         return (KimTypeService) GlobalResourceLoader.getService(kimTypeServiceName);

                 } catch (Exception exception) {

                         // if we get an exception loading the remote KimTypeService, then instead of completly failing,

                         // we'll handle the exception and return a null reference to the service

                         LOG.error("Unable to find KIM type service with name: " + kimTypeServiceName, exception);

                         return null;

                 }

         }

 }