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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.

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/*
 * Copyright (c) 2002-2003 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.xwork.interceptor;

import com.opensymphony.xwork.Action;
import com.opensymphony.xwork.ActionInvocation;
import com.opensymphony.xwork.ModelDriven;
import com.opensymphony.xwork.util.OgnlValueStack;


/**
 * Watches for ModelDriven Actions and adds the model from the Action on to the
 * value stack.
 * 
 * Note:  The ModelDrivenInterceptor must come before the both
 * {@link StaticParametersInterceptor} and {@link ParametersInterceptor} if you
 * want the parameters to be applied to the model.
 *
 * @author $Author: unkyaku $
 * @version $Revision: 1.2 $
 */
public class ModelDrivenInterceptor extends AroundInterceptor {
    //~ Methods ////////////////////////////////////////////////////////////////

    protected void after(ActionInvocation dispatcher, String result) throws Exception {
    }

    protected void before(ActionInvocation invocation) throws Exception {
        Action action = invocation.getAction();

        if (action instanceof ModelDriven) {
            ModelDriven modelDriven = (ModelDriven) action;
            OgnlValueStack stack = invocation.getStack();
            stack.push(modelDriven.getModel());
        }
    }
}