/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.jboss.as.weld.webtier.jsp;
import org.apache.jasper.runtime.JspApplicationContextImpl;
import org.jboss.as.weld.util.Reflections;
import org.jboss.weld.servlet.api.helpers.AbstractServletListener;
import javax.el.ELContextListener;
import javax.el.ExpressionFactory;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Inject;
import javax.servlet.ServletRequestEvent;
import javax.servlet.jsp.JspApplicationContext;
import javax.servlet.jsp.JspFactory;
/**
* The Web Beans JSP initialization listener
*
*
* @author Pete Muir
* @author Stuart Douglas
*
*/
public class JspInitializationListener extends AbstractServletListener {
private volatile boolean installed = false;
private static class WeldJspApplicationContextImpl extends ForwardingJspApplicationContextImpl {
private final JspApplicationContextImpl delegate;
private final ExpressionFactory expressionFactory;
public WeldJspApplicationContextImpl(JspApplicationContextImpl delegate, ExpressionFactory expressionFactory) {
this.delegate = delegate;
this.expressionFactory = expressionFactory;
}
@Override
protected JspApplicationContextImpl delegate() {
return delegate;
}
@Override
public ExpressionFactory getExpressionFactory() {
return expressionFactory;
}
}
@Inject
private BeanManager beanManager;
@Override
public void requestInitialized(ServletRequestEvent sre) {
if (!installed && beanManager!= null && JspFactory.getDefaultFactory() != null) {
synchronized (this) {
if (!installed) {
installed = true;
// get JspApplicationContext.
JspApplicationContext jspAppContext = JspFactory.getDefaultFactory().getJspApplicationContext(
sre.getServletContext());
// register compositeELResolver with JSP
jspAppContext.addELResolver(beanManager.getELResolver());
jspAppContext.addELContextListener(Reflections.<ELContextListener> newInstance(
"org.jboss.weld.el.WeldELContextListener", getClass().getClassLoader()));
// Hack into JBoss Web/Catalina to replace the ExpressionFactory
JspApplicationContextImpl wrappedJspApplicationContextImpl = new WeldJspApplicationContextImpl(
JspApplicationContextImpl.getInstance(sre.getServletContext()), beanManager
.wrapExpressionFactory(jspAppContext.getExpressionFactory()));
sre.getServletContext().setAttribute(JspApplicationContextImpl.class.getName(),
wrappedJspApplicationContextImpl);
}
}
}
// otherwise something went wrong starting Weld, so don't register with JSP
}
}