[Helma-user] __defineGetter__

[jfwittmann]

Michael Platzer schrieb:
> Hi list,
>
> One of the cool new features of Helma 1.6.0 will be the ability to 
> define methods for retrieving and setting properties throught the use of 
> defineGetter, and defineSetter.
> -> 
> http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Guide:Creating_New_Objects:Defining_Getters_and_Setters
>   

In the Mustang includes Rhino JavaScript engine it's already possible.
this was a little test by me with the known  prototype lib on server side.
....
function MapAdapter(map) {
    this.__has__ = function(name) {
       return map.containsKey(name);
    }
    this.__get__ = function(name) {
        return map.get(name);
    }
    this.__put__ = function(name, value) {
        map.put(name, value);
    }
    this.__delete__ = function(name) {
        map.remove(name);
    }
    this.__getIds__ = function() {
        var result = [];
        for (var keyIterator = map.keySet().iterator(); 
keyIterator.hasNext();) {
            var key = keyIterator.next();
            result.push(key);
        }
        return result;
    }   
};

var Hash = function(obj) {
    if (obj instanceof java.util.HashMap) {
        Object.extend(this, new JSAdapter(new MapAdapter(obj)))
    } else {
        Object.extend(this, new JSAdapter(new MapAdapter(new 
java.util.HashMap())))
        Object.extend(this, obj || {});
    }
};
....

And here is another blog thread to this interesting topic too.

http://blogs.sun.com/sundararajan/entry/self_javascript_and_jsadapter

Felix