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/*
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 *
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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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package org.glassfish.webservices;

import java.lang.reflect.Method;

import java.rmi.UnmarshalException;

import javax.xml.namespace.QName;
import javax.xml.rpc.handler.GenericHandler;
import javax.xml.rpc.handler.MessageContext;

import org.glassfish.api.invocation.InvocationManager;
import org.glassfish.ejb.api.EJBInvocation;

/**
 * This handler is inserted last in the handler chain for an
 * ejb web service endpoint.  It ensures that the application handlers
 * did not change anything in the soap message that would change the
 * dispatch method.
 *
 * @author Kenneth Saks
 */
public class EjbContainerPostHandler extends GenericHandler {

    private final WsUtil wsUtil = new WsUtil();

    public EjbContainerPostHandler() {}

    @Override
    public QName[] getHeaders() {
        return new QName[0];
    }

    @Override
    public boolean handleRequest(MessageContext context) {
        EJBInvocation inv = null;
        try {
            WebServiceContractImpl wscImpl = WebServiceContractImpl.getInstance();
            InvocationManager invManager = wscImpl.getInvocationManager();
            inv = EJBInvocation.class.cast(invManager.getCurrentInvocation());
            Method webServiceMethodInPreHandler = inv.getWebServiceMethod();
            if( webServiceMethodInPreHandler != null ) {
                // Now that application handlers have run, do another method
                // lookup and compare the results with the original one.  This
                // ensures that the application handlers have not changed
                // the message context in any way that would impact which
                // method is invoked.
                Method postHandlerMethod = wsUtil.getInvMethod(
                        (com.sun.xml.rpc.spi.runtime.Tie)inv.getWebServiceTie(), context);
                if( !webServiceMethodInPreHandler.equals(postHandlerMethod) ) {
                    throw new UnmarshalException("Original method " + webServiceMethodInPreHandler +
                         " does not match post-handler method ");
                }
            }
        } catch(Exception e) {
            wsUtil.throwSOAPFaultException(e.getMessage(),
                                           context);
        }
        return true;
    }
}