/**
* Copyright (C) 2011 JTalks.org Team
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jtalks.jcommune.web.util;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import javax.servlet.ServletContext;
/**
* Provides possibility to get bean from ApplicationContext
*
* @author Oleg Tkachenko
*/
public class AppContextUtils {
/**
* Returns bean from application context.
*
* @param servletContext to find the web application context for
* @param tClass interface or superclass of the actual class.
* @param beanName the name of the bean to retrieve
* @return an instance of the bean
* @throws IllegalStateException if the root WebApplicationContext could not be found
* @throws ClassCastException if the bean found in context is not assignable to the type of tClass
*/
public static <T> T getBeanFormApplicationContext(ServletContext servletContext, Class<T> tClass, String beanName) {
WebApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
if (beanName == null) return context.getBean(tClass);
return tClass.cast(context.getBean(beanName));
}
public static <T> T getBeanFormApplicationContext(ServletContext servletContext, Class<T> tClass) {
return getBeanFormApplicationContext(servletContext , tClass, null);
}
}