/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache 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.apache.org/licenses/LICENSE-2.0
   *
   * 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.apache.syncope.sra;
  
  import org.springframework.beans.factory.config.BeanDefinition;
  import org.springframework.beans.factory.support.AbstractBeanDefinition;
  import org.springframework.beans.factory.support.BeanDefinitionRegistry;
  import org.springframework.beans.factory.support.RootBeanDefinition;
  import org.springframework.context.ApplicationListener;
  import org.springframework.context.ConfigurableApplicationContext;
  
  public final class ApplicationContextUtils {
  
      public static <T> T getOrCreateBean(
              final ConfigurableApplicationContext ctx,
              final String actualClazz,
              final Class<T> type) throws ClassNotFoundException {
  
          T bean;
          if (ctx.getBeanFactory().containsSingleton(actualClazz)) {
              bean = type.cast(ctx.getBeanFactory().getSingleton(actualClazz));
          } else {
              if (ApplicationListener.class.isAssignableFrom(type)) {
                  RootBeanDefinition bd = new RootBeanDefinition(
                          Class.forName(actualClazz), AbstractBeanDefinition.AUTOWIRE_BY_TYPE, false);
                  bd.setScope(BeanDefinition.SCOPE_SINGLETON);
                  ((BeanDefinitionRegistry) ctx.getBeanFactory()).registerBeanDefinition(actualClazz, bd);
                  bean = ctx.getBean(type);
              } else {
                  bean = type.cast(ctx.getBeanFactory().
                          createBean(Class.forName(actualClazz), AbstractBeanDefinition.AUTOWIRE_BY_TYPE, false));
                  ctx.getBeanFactory().registerSingleton(actualClazz, bean);
              }
          }
          return bean;
      }
  
      private ApplicationContextUtils() {
          // private constructor for static utility class
      }
  }