Re: LookupDispatchAction (Newbie)

[Michael McGrady]

Once you see how LookupDispatchAction works, you should also see that it 
is an unnecessarily complicated solution.  Try 
http://wiki.apache.org/struts/StrutsCatalogMultipleImageTagsSimplified 
which shows that all you have to do is:

   String button = null;
   Enumeration enum = request.getParameterNames();
   String parameterName = null;
   while(enum.hasMoreElements()) {
     parameterName = (String)enum.nextElement();
     if(parameterName.endsWith(".x")) {
       button = parameterName.substring(0,parameterName.indexOf('.'));
     }
   }
Isn't that a great deal simpler?  If you want to solve it with a class, 
then do somethin like:

*public class ImageTagUtil {
 public static String getName(HttpServletRequest request) {
   String command = null;
   String buttonValue = null;
   Enumeration enum = request.getParameterNames();
   while(enum.hasMoreElements()) {
     buttonValue = (String)enum.nextElement();
     if(buttonValue.endsWith(".x")) {
       command = buttonValue.substring(0,buttonValue.indexOf('.'));
     }
   }
   return command;
 }
}*
However, if you love the complications, essentially the idea is to put 
the paramter value together with method names in order to map the 
buttons to methods.  So, if you have buttons returning button.add and 
button.delete, your parameter value will be "button".  Once you know 
that the parameter is button, then you can search for button.? and ? 
will be the method name.  This is a totally unnecessary complication, 
since we already have .x and .y at the end so generously supplied by the 
standard HTML.  So the above code does the same thing without tying the 
solution to the parameter value, which frees the parameter value for 
other uses and which decouples the solution from struts.

Regards,
Michael


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