RE: Help needed to Intercept and overide getter and setter method calls

>         property.put("value1", new Integer(2));
>         property.put("value2", new Integer(3));
>         property.put("value2", new Integer(0));

>         i.eval("property.value3 = property.value2 * 
> property.value1;");
> 
>         // I want to intercept the calls to Properties getter 
> and setter values and call the Property.get("value1") etc

Not directly, no. I, too, had the same idea for our integration with
BeanShell (my product has objects that keep attributes in a simple hashmap,
exactly like this).

There is a way to do this without BeanShell code changes, but it's a bit
painful: you use reflection to examine the list of keys in your map, and
create a wrapper class on the fly with something like BCEL (Byte Code
Engineering Library), like a proxy class, that you wrap your object with
before passing to BeanShell. This wrapper would have getValue1(), etc.,
methods.

But it would be nice if there was a simple hook or hooks in the field
resolution code that could get invoked when a field resolution failed using
the current mechanisms. Exactly like the "invoke()" mechanism already
available for method resolution.. 

(Actually, there would need to be two hooks along the lines of:

   Object getField(..., String fieldName);
   void setField(..., String fieldName, Object value);

And the appropriate one would be invoked depending on whether an lvalue or
an rvalue was required).

What do you think, Pat?




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