Thanks Andreas.
Hi Tim,
In addition to JSAdapter, there is also
jdk.nashorn.api.scripting.JSObject. Any Java class can implement this
interface to trap get/set indexed/named properties, call/new.
See also
https://wiki.openjdk.java.net/display/Nashorn/Nashorn+jsr223+engine+notes
And this interface can also be implemented in script - as usual. See
$nashorn_repo/test/script/basic/JDK-8024847.js as well.
-Sundar
On Saturday 01 March 2014 04:30 PM, Andreas Rieber wrote:
Hi Tim,
this is possible with JSAdapter described in [1].
Short sketch could look like this:
---
var myobj = (function () {
return new JSAdapter() {
__get__: function(name) {
print("getter called for '" + name + "'"); return name;
},
__put__: function(name, value) {
print("setter called for '" + name + "' with " + value);
}
}
})();
myobj.x;
myobj.x = 12;
myobj[3];
---
output:
getter called for 'x'
setter called for 'x' with 12
getter called for '3'
---
happy scripting
Andreas
[1] https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions
On 01.03.2014 10:27, Tim Fox wrote:
Hello Nashorn folks,
I have a JavaScript object, and I'd like to 'override' what the index
operator [] does on it.
I.e. when I do
var x = myobj[3];
I actually want it to call some other function on the object, e.g.
myobj.get(3);
I'm pretty sure this isn't possible in pure JS, so I was thinking of
wrapping a Java Object as a JavaScript object, e.g. if I have
public class MyJavaClass {
public Object get(int index) {
...
return something;
}
}
I would like to have a JS wrapper for it, such that when I call:
var x = myJavaWrapper[3];
It actually calls:
myJavaObject.get(3);
Is this possible in Nashorn?
