RE: Struts 2 – changing method signature

[Martin Gainty <mg...@hotmail.com>]

take a look at com.opensymphony.xwork2.interceptor.ParametersInterceptor

This interceptor gets all parameters from ActionContext.getParameters() and sets them on the value stack by
 calling ValueStack.setValue(String, Object), typically resulting in the values submitted in a form
 request being applied to an action in the value stack. Note that the parameter map must contain a String key and
 often containers a String[] for the value.
The interceptor takes one parameter named 'ordered'. When set to true action properties are guaranteed to be
 set top-down which means that top action's properties are set first. Then it's subcomponents properties are set.
/*so it takes all the context params and puts it onto VS*/

the ParametersInterceptor is referenced via
<interceptor name="params" class="com.opensymphony.xwork2.interceptor.ParametersInterceptor"/>
by params which is already referenced from basicStack e.g.
         <interceptor-stack name="basicStack">
                <interceptor-ref name="exception"/>
                <interceptor-ref name="servletConfig"/>
                <interceptor-ref name="prepare"/>
                <interceptor-ref name="checkbox"/>
                <interceptor-ref name="actionMappingParams"/>
                <interceptor-ref name="params">
                    <param name="excludeParams">dojo\..*,^struts\..*</param>
                </interceptor-ref>
                <interceptor-ref name="conversionError"/>
            </interceptor-stack>

where the action references 'params' via interceptor-ref name e.g.
   <package name="skill" extends="default" namespace="/skill">
        <default-interceptor-ref name="crudStack"/>
        <action name="list" class="org.apache.struts2.showcase.action.SkillAction" method="list">
            <result>/empmanager/listSkills.jsp</result>
            <interceptor-ref name="basicStack"/>
        </action>

http://struts.apache.org/2.0.14/struts2-core/apidocs/com/opensymphony/xwork2/interceptor/ParametersInterceptor.html

Martin 
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> Date: Wed, 6 May 2009 12:18:55 -0700
> From: cm132005@gmail.com
> To: user@struts.apache.org
> Subject: Struts 2 – changing method signature
> 
> 
> In Struts 2, is DefaultActionInvocation invokeAction responsible for invoking
> the action methods and what would be a good approach to change all action
> method signature to have a fixed number of parameters? 
> 
> For regular actions, I implemented a BaseAction class with an abstract
> method and having the execute() call this new executeImpl(RequiredParam
> param) but not sure how this can be done for the methods in Dispatch
> Actions. In Struts 1, one could change the signature for methods in dispatch
> actions by overriding the DispatchAction getMethod and dispatchMethod
> methods. 
> 
> The requirement is to have one parameter passed in all action methods
> whether that be execute() or any other. Any help would be greatly
> appreciated. 
> 
> Thanks.
> 
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