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

there's also the map access syntax:

map = new java.util.HashMap();
map{"key"} = "value";

but that's not as simple as "map.key = value;".

j.


> -----Original Message-----
> From: Shankar Unni [mailto:[email protected]] 
> Sent: Tuesday, November 04, 2003 9:28 PM
> To: beanshell-developers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Subject: RE: [Beanshell-dev] 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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