/**
    * Copyright 2005-2016 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.krad.data;
  
  import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
  import org.kuali.rice.core.framework.resourceloader.BeanFactoryResourceLoader;
  import org.kuali.rice.krad.data.DataObjectService;
  import org.kuali.rice.krad.data.KradDataServiceLocator;
  import org.springframework.beans.factory.FactoryBean;
  import org.springframework.context.support.ClassPathXmlApplicationContext;
  
  import javax.xml.namespace.QName;
  
  /**
   * A factory bean which load and/or acquires a reference to the data framework.
   *
   * <p>Will lazy-initialize the framework if it's not already been initialized. The factory bean will return a reference
   * the {@link DataObjectService} which is the main API entry point into the data framework.</p>
   *
   * @see DataObjectService
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class KradDataFactoryBean implements FactoryBean<DataObjectService> {
  
      private static final String SPRING_FILE = "classpath:org/kuali/rice/krad/data/config/KRADDataSpringBeans.xml";
  
      @Override
      public DataObjectService getObject() throws Exception {
          // first, let's see if it's already been initialized
          DataObjectService dataObjectService = KradDataServiceLocator.getDataObjectService();
          if (dataObjectService == null) {
              ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(SPRING_FILE);
              BeanFactoryResourceLoader rl = new BeanFactoryResourceLoader(new QName("krad-data"), context);
              rl.start();
              GlobalResourceLoader.addResourceLoader(rl);
              dataObjectService = KradDataServiceLocator.getDataObjectService();
          }
          if (dataObjectService == null) {
              throw new IllegalStateException("Failed to locate or initialize krad data framework.");
          }
          return dataObjectService;
      }
  
      @Override
      public Class<?> getObjectType() {
          return DataObjectService.class;
      }
  
      @Override
      public boolean isSingleton() {
          return true;
      }
  
  }