Hello,
On 16/06/05, Jonathan Carlson <Jonathan.Carlson@...> wrote:
> I just read about a feature in BeanShell and I'm hoping it can be done
> as easily in Groovy.
Sure 
> You can write a generic Decorator/Proxy by writing a method called
> invoke(methodName, args[]) Any non-implemented method call gets
> redirected to this method. It is kind of like the Java Dynamic Proxy
> interface, but with far less hassle and limitations.
>
> Is this in Groovy? If not, could it easily be added?
It's been there since the beginning of Groovy, but is probably
"under-documented" 
In fact, you've used that feature each time you've used Groovy
builders or POGOs (Plain Old Groovy Objects).
All classes written in Groovy extend GroovyObjectSupport:
http://groovy.codehaus.org/apidocs/groovy/lang/GroovyObjectSupport.html
Notice the invokeMethod() method?
Let's take an example:
class Foo {
void methodOne() { println "invoked methodOne()" }
int methodTwo(bar) { println "invoked methodTwo(${bar})"; return 255 }
def invokeMethod(String methodName, Object params) {
println "invoked ${methodName}()"
}
static void main(args) {
def f = new Foo()
f.methodOne()
def i = f.methodTwo("bar")
f.inexistantMethod()
}
}
Execute it, and you'll notice that standard methods are called, and if
a method doesn't exist, it's routed to the invokeMethod() method.
I guess that's what you were looking for?
Many objects in Groovy implement that interface (GroovyObject) or
extend that class (GroovyObjectSupport), like Expandos, builders, or
Proxy, etc...
--
Guillaume Laforge
http://glaforge.free.fr/weblog/?catid=2
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