Native Nashorn Object vs JSObject

[A. Sundararajan]

By design, JSObject properties are either Strings or integers.  When you use

    jsobj.foo = 33

or

    jsobj["foo"] = 33

JSObject.setMember(String, Object) method will be called for the same by 
Nashorn's linker. If you use

    jobj[1] = 33;

then JSObject.setSlot(int, Object) method will be called

If you use anything else as property (say a script object as in your 
example), that would be ignored.

Hope this explains,
-Sundar

Serguei Mourachov wrote:
> On 11/6/2014 8:22 AM, A. Sundararajan wrote:
>> Will you please post full source of your JSObject? (just enough to 
>> reproduce issue you're talking about).
>>
>> -Sundar
>>
>> On Wednesday 05 November 2014 05:14 AM, Serguei Mourachov wrote:
>>> It looks like some operations that are available for native Nashorn 
>>> objects, are not implemented for JSObject.
>>> For example, following script works and prints '6': engine.eval("var 
>>> obj={};var key={}; obj[key]=6;print(obj[key])");
>>> In case when 'obj' is an implementation of  JSObject, the script 
>>> runs without any error, printing 'null'.
>>>
>>> SM
>>>
>>>
>>
> here is the sample code:
>
>     public static void main(String[] args) throws Exception {
>         NashornScriptEngineFactory factory = new 
> NashornScriptEngineFactory();
>         ScriptEngine engine = factory.getScriptEngine();
>
>         Bindings b = engine.getBindings(ScriptContext.ENGINE_SCOPE);
>
>         AbstractJSObject jsobj = new AbstractJSObject(){
>             Map<String, Object> map = new HashMap<>();
>
>             @Override
>             public void setMember(String name, Object value) {
>                 map.put(name, value);
>             }
>
>             @Override
>             public Object getMember(String name) {
>                 return map.get(name);
>             }
>
>             @Override
>             public void removeMember(String name) {
>                 map.remove(name);
>             }
>
>             @Override
>             public boolean hasMember(String name) {
>                 return map.containsKey(name);
>             }
>         };
>         b.put("jsobj", jsobj);
>         engine.eval("var obj={}; var key={}; 
> obj[key]=6;print(obj[key])");
>         engine.eval("jsobj[key]=6;print(jsobj[key])");
>
>     }
>
> if you replace var key={} with var key='foo' the code works as expected
>
> SM
>
>