Parameter passing from JSF to a Java class

Question

Hi,
I am new to JSF, and I looked around in the questions to find an answer to my "Parameter passing" question. No luck..
Below is an example that illustrate what I mean:
This illustrate a way that I have found to work:
<h:commandButton value="New"
disabled="#{buttonHandler.newDisabled}" />
<h:commandButton value="Delete"
disabled="#{buttonHandler.deleteDisabled}" />
But something like this is more how I would prefer to do it:
<h:commandButton value="New"
disabled="#{buttonHandler.Disabled("New")}" />
<h:commandButton value="Delete"
disabled="#{buttonHandler.Disabled("Delete")}" />
Yes, I know it does not work.. but it illustrates what I want to do. I would like to use the same Java method for all buttons and just pass a parameter to sort out which one it is.
Someone knows how to achieve this?

Answer 1

In the get(key), you can pass in object, and do
whatever you want with it. That's exactly what you
want, but maynot be as nice, but that's EXACTLY what
you want I think, except you have to work with get
function, not your function. But you can just call
your function in the get function.(Shudder) Really, "hack" is too kind for this.
So to continue my checksum example above: I can "easily" find the checksum of an object by creating an implementation of Map that really only implements the get() method and throws a method-not-implemented exception for all other methods (violating the rule that all classes implementing Map should follow Map semantics). Then I create a getChecksum() method on my backing bean, which returns this Map adapter and allows me to property-bind+map-bind to:
#{myBean.checksum[myObject]}
Now for every single method I want to implement, I have to create a whole new class that implements Map but really isn't a Map! Horrors! And this assumes, as you later note, that I only want to use one parameter---never more. Of course, for mutiple parameters, I could always create a map of maps, with each sub-map another custom class implementing Map just so that it can represent another parameter and allow:
#{myBean.checksum[myObject][myColor][myWeight]}
Disgusting---a fake semantics-violating map class for each parameter?
Can someone who designed JSF let us know why in the world that we can't pass parameters to a method?
Garret