/*
    * Copyright 2010 Capgemini
    * Licensed 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 net.sf.appstatus.support.spring;
  
  import net.sf.appstatus.core.IObjectInstantiationListener;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.BeansException;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.ApplicationContextAware;
  
  /**
   * 
   * Spring-aware instantiation listener for web applications.
   * 
   * @author Nicolas Richeton
   * 
   */
  public class SpringObjectInstantiationListener implements
  		IObjectInstantiationListener, ApplicationContextAware {
  	private static Logger logger = LoggerFactory
  			.getLogger(SpringObjectInstantiationListener.class);
  
  	ApplicationContext applicationContext;
  
  	/**
  	 * Constructor.
  	 * 
  	 * @param context
  	 *            Current servlet context.
  	 */
  	public SpringObjectInstantiationListener() {
  	}
  
  	public Object getInstance(String className) {
  		Object obj = null;
  
  		try {
  			obj = applicationContext.getBean(className);
  		} catch (BeansException e) {
  			logger.info("Unable to get Bean {}", e, className);
  		}
  
  		return obj;
  	}
  
  	public void setApplicationContext(ApplicationContext applicationContext)
  			throws BeansException {
  		this.applicationContext = applicationContext;
  	}
  
  }