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Struts example source code file (NullHandler.java)

This example Struts source code file (NullHandler.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

nullhandler, nullhandler, object, object, string, string, util

The Struts NullHandler.java source code

//--------------------------------------------------------------------------
//Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//All rights reserved.
//
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions are
//met:
//
//Redistributions of source code must retain the above copyright notice,
//this list of conditions and the following disclaimer.
//Redistributions in binary form must reproduce the above copyright
//notice, this list of conditions and the following disclaimer in the
//documentation and/or other materials provided with the distribution.
//Neither the name of the Drew Davidson nor the names of its contributors
//may be used to endorse or promote products derived from this software
//without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//DAMAGE.
//--------------------------------------------------------------------------
package com.opensymphony.xwork2.conversion;

import java.util.Map;

/**
* Interface for handling null results from Chains.
* Object has the opportunity to substitute an object for the
* null and continue.
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
*/
public interface NullHandler
{
    /**
        Method called on target returned null.
     */
    public Object nullMethodResult(Map<String, Object> context, Object target, String methodName, Object[] args);
    
    /**
        Property in target evaluated to null.  Property can be a constant
        String property name or a DynamicSubscript.
     */
    public Object nullPropertyValue(Map<String, Object> context, Object target, Object property);
}

Other Struts examples (source code examples)

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