/*
    * 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.web;
  
  import javax.servlet.ServletContext;
  
  import net.sf.appstatus.core.IObjectInstantiationListener;
  
  import org.springframework.beans.BeansException;
  import org.springframework.web.context.WebApplicationContext;
  import org.springframework.web.context.support.WebApplicationContextUtils;
  
  /**
   * 
   * Spring-aware instantiation listener for web applications.
   * 
   * @author Nicolas Richeton
   * 
   */
  public class SpringObjectInstantiationListener implements
  		IObjectInstantiationListener {
  	WebApplicationContext webApplicationContext = null;
  
  	/**
  	 * Constructor.
  	 * 
  	 * @param context
  	 *            Current servlet context.
  	 */
  	public SpringObjectInstantiationListener(ServletContext context) {
  		webApplicationContext = WebApplicationContextUtils
  				.getRequiredWebApplicationContext(context);
  	}
  
  	public Object getInstance(String className) {
  		Object obj = null;
  
  		try {
  			obj = webApplicationContext.getBean(className);
  		} catch (BeansException e) {
  		}
  
  		return obj;
  	}
  
  }