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

Hi,

Your best bet is to use BshNameSpace instead of java.util.Properties; it
is more flexible and the API is similar.

On Tue, 2003-11-04 at 22:31, Jp Vinjamoori wrote:
> Hi All,
> 
> I have a weird requirement and pretty new to bean shell (I have been playing 
> with it for couple of days)
> 
> I am having the following code.
> 
> ------------------------------------------------------
> 
> import java.util.Properties;
> 
> import bsh.EvalError;
> import bsh.Interpreter;
> 
> public class PropertyTest {
>     public static void main(String[] args) throws EvalError {
>         Properties property = new Properties();
> 
>         property.put("value1", new Integer(2));
>         property.put("value2", new Integer(3));
>         property.put("value2", new Integer(0));
> 
>         Interpreter i = new Interpreter(); // Construct an interpreter
> 
>         i.set("property", property);
> 
>         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
>         // Can I do it? If yes, please tell me.
> 
>         //The following line should print 6
>         System.out.println("The value3:" + property.get("value3"));
>     }
> }
> 
> ------------------------------------------------------
> 
> Basically, what I want is to intercept the getter and setter called by bean 
> shell and translate it to properties.get("value1") or 
> properties.get("value2") or properties.set("value3", value)
> 
> Is it possible? How would I go about it.
> 
> One option I figured out is to create commands for set and get and use it to 
> set and get values. But the expression would have to change it to some thing 
> like
> 
> set(property, get(property, "value2") * get(property, "value1"));
> 
> But my requirement is to let the user define it as in code above 
> ["property.value3 = property.value2 * property.value1;"]. Please help.
> 
> 
> Thanks in advance,
> _Jp
> 
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Slava Pestov


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