I made something along the same lines, but not with
reflection. I've attached the file.
David
--- DONNIE HALE <[EMAIL PROTECTED]> wrote:
> Craig,
>
> Last week, there was a thread labelled: "Minimizing
> Action class proliferation". I think you were on
> your brief "no list access" hiatus. :)
>
> Below is the long-and-short of a proposed
> enhancement to Struts that could optionally be used
> by developers if they are so inclined. The only
> piece missing from this is a proposed change to the
> "action" XML elemen to include a "handler" or
> "method" attribute. This would be used as the first
> parameter to the "class.getMethod" call in the code
> below.
>
> I won't regurgitate the whole thread here. I was
> just wondering if you had any thoughts on this?
>
> Thanks,
>
> Donnie
>
>
> >>> [EMAIL PROTECTED] 03/07/01 10:05PM
> >>>
> Donnie,
>
> How about this as an alternative. I have created a
> subclass of Action called
> StandardAction which uses reflection to invoke a
> method with the same name
> as the "actions" path (defined in the
> struts-config.xml file). So all you
> have to do is extend the Standard action and
> implement methods that
> correspond to the paths that use it.
>
> For example if you define three actions in your
> struts-config.xml file of
> /saveOrder, /editOrder and /deleteOrder that all use
> a class OrderAction
> which extends StandardAction and then create a
> OrderAction class as shown
> below:
>
> I hope this is of use.
>
> Niall
>
>
> --------------Example of StandardAction
> implementation-----------
>
> public class OrderAction extends StandardAction{
>
> public ActionForward saveOrder(ActionMapping
> mapping,
> ActionForm form,
> HttpServletRequest
> request,
> HttpServletResponse
> response) {
>
>
> }
> public ActionForward editOrder(ActionMapping
> mapping,
> ActionForm form,
> HttpServletRequest
> request,
> HttpServletResponse
> response) {
>
>
> }
> public ActionForward deleteOrder(ActionMapping
> mapping,
> ActionForm form,
> HttpServletRequest
> request,
> HttpServletResponse
> response) {
>
>
> }
> }
>
> -------------------------------StandardAction
> Class-----------
> package nkp;
>
> import javax.servlet.http.HttpServletRequest;
> import javax.servlet.http.HttpServletResponse;
> import javax.servlet.http.HttpSession;
>
> import org.apache.struts.action.Action;
> import org.apache.struts.action.ActionForm;
> import org.apache.struts.action.ActionForward;
> import org.apache.struts.action.ActionMapping;
> import java.lang.reflect.Method;
> import java.lang.reflect.InvocationTargetException;
>
> /**
> * @author Niall Pemberton
> * @version 1.0
> */
>
> public abstract class StandardAction extends Action
> {
>
> public ActionForward perform(ActionMapping
> mapping,
> ActionForm form,
> HttpServletRequest
> request,
> HttpServletResponse
> response) {
>
>
> // Determine the method name to call (based on
> the path without the "/")
> String methodName =
> mapping.getPath().substring(1);
>
> // Get the method with the same name as the path
> Class cls = this.getClass();
> Method method = null;
> try {
> method = cls.getMethod(methodName, new Class[]
> {ActionMapping.class,
>
> ActionForm.class,
>
> HttpServletRequest.class,
>
> HttpServletResponse.class});
> }
> catch (NoSuchMethodException ex) {
> servlet.log("Method "+methodName+" not found
> in class
> "+this.toString());
> }
>
> // Invoke the Method
> Object obj = null;
> try {
> obj = method.invoke(this, new Object[]
> {mapping, form, request,
> response});
> }
> catch (InvocationTargetException etargEx) {
> servlet.log("Error Involing Method
> "+methodName+"(InvocationTargetException)
> "+this.toString());
> }
> catch (IllegalAccessException illEx) {
> servlet.log("Error Involing Method
> "+methodName+"(IllegalAccessException)
> "+this.toString());
> }
> ActionForward actionForward =
> (ActionForward)obj;
>
> // Forward control to the specified success URI
> return actionForward;
> }
> }
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GenericAction.java
