/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.invocation;
import java.io.Serializable;
import javax.interceptor.InvocationContext;
import static org.jboss.invocation.InvocationMessages.msg;
/**
* An interceptor which passes invocations through a series of nested interceptors.
*
* @author <a href="mailto:cdewolf@redhat.com">Carlo de Wolf</a>
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
class ChainedInterceptor implements Interceptor, Serializable {
private static final long serialVersionUID = 7951017996430287249L;
private final Interceptor[] interceptors;
/**
* Construct a new instance.
*
* @param interceptors the child interceptors
*/
ChainedInterceptor(final Interceptor... interceptors) {
if (interceptors == null) {
throw msg.nullParameter("interceptors");
}
this.interceptors = interceptors;
}
/** {@inheritDoc} */
public Object processInvocation(final InvocationContext context) throws Exception {
final InvocationContext childContext = new DelegatingInvocationContext(context) {
private int index = 0;
public Object proceed() throws Exception {
if (index < interceptors.length) {
try {
return interceptors[index++].processInvocation(this);
} finally {
index--;
}
} else {
return super.proceed();
}
}
};
return childContext.proceed();
}
}