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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) 2002-2006 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.xwork2.interceptor;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ModelDriven;
import com.opensymphony.xwork2.util.ValueStack;


/**
 * 
 *
 * Watches for {@link ModelDriven} actions and adds the action's model 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.
 * 
 * 
 Note:  The ModelDrivenInterceptor will only push the model into the stack when the
 * model is not null, else it will be ignored.
 *
 * 
 *
 * 
 Interceptor parameters:
 *
 * 
 *
 * 

 *
 * None
 *
 * 
 *
 * 
 *
 *  Extending the interceptor:
 *
 * 

 *
 * 
 *
 * There are no known extension points to this interceptor.
 *
 * 
 *
 * 
 Example code:
 *
 * 
 * 
 * <action name="someAction" class="com.examples.SomeAction">
 *     <interceptor-ref name="model-driven"/>
 *     <interceptor-ref name="basicStack"/>
 *     <result name="success">good_result.ftl</result>
 * </action>
 * 
 * 
 * 
 * @author tm_jee
 * @version $Date: 2006-09-30 07:34:02 +0200 (Sa, 30 Sep 2006) $ $Id: ModelDrivenInterceptor.java 1142 2006-09-30 05:34:02Z mrdon $
 */
public class ModelDrivenInterceptor extends AbstractInterceptor {

    public String intercept(ActionInvocation invocation) throws Exception {
        Object action = invocation.getAction();

        if (action instanceof ModelDriven) {
            ModelDriven modelDriven = (ModelDriven) action;
            ValueStack stack = invocation.getStack();
            if (modelDriven.getModel() !=  null) {
            	stack.push(modelDriven.getModel());
            }
        }
        return invocation.invoke();
    }
}