Subj : Adding an existing ScriptableObject instance to the scope?
To   : netscape.public.mozilla.jseng
From : JPsychic
Date : Fri Feb 04 2005 10:52 pm


I have two classes SO1 and SO2 that subclass ScriptableObject
I pre-create an instance of SO2.class called ISO2 using:

ISO2 = new SO2();

Both classes SO1 and SO2 define a method:

public void jsFunction_hello()
{
    // Do nothing
}

Now, I register a new instance of SO1 into the scope using:

---

final Context cx = Context.enter();
Scriptable scope = cx.initStandardObjects();
try {
    ScriptableObject.defineClass(scope, SO1.class);
} catch (Exception ex)
{
    ex.printStackTrace();
    System.exit(0);
}
Scriptable so = cx.newObject(scope, "com.package.SO1", null);
scope.put("o1", scope, so);
Context.exit();

---

I invoke the hello() function on 'o1' using:

Object result = cx.evaluateString(sh.scope, "o1.hello()", "<cmd>", 1,
null);

This works great.

---

Now, I register the 'existing instance' of SO2 called ISO2 using:

final Context cx = Context.enter();
Scriptable scope = cx.initStandardObjects();
scope.put("o2", scope, ISO2);
Context.exit();

However, when I attempt to invoke the hello() function on 'o2':

Object result = cx.evaluateString(sh.scope, "o1.hello()", "<cmd>", 1,
null);

I get the following exception:

org.mozilla.javascript.EcmaError: TypeError: hello is not a function.
(<cmd>#1)
	at
org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3240)
	at
org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3230)
	at
org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3246)
	at
org.mozilla.javascript.ScriptRuntime.typeError1(ScriptRuntime.java:3258)
	at
org.mozilla.javascript.ScriptRuntime.notFunctionError(ScriptRuntime.java:3317)
	at
org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:1987)
	at
org.mozilla.javascript.optimizer.OptRuntime.callProp0(OptRuntime.java:114)
	at org.mozilla.javascript.gen.c1._c0(<cmd>:1)
	at org.mozilla.javascript.gen.c1.call(<cmd>)
	at
org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:304)
	at
org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2769)
	at org.mozilla.javascript.gen.c1.call(<cmd>)
	at org.mozilla.javascript.gen.c1.exec(<cmd>)
	at org.mozilla.javascript.Context.evaluateString(Context.java:1220)

---

So how do I add an existing instance of a ScriptableObject subclass
into the scope and get access to its methods?

Instead of:

scope.put("o2", scope, ISO2);

I tried:

Object oISO2 = Context.javaToJS(ISO2, scope);
ScriptableObject.putProperty(scope, "o2", oISO2);

.... still didn't work.

Then, I tried:

try {
    ScriptableObject.defineClass(scope, so.getClass());
} catch (Exception ex)
{
    throw new ScriptException(ex);
}
scope.put("o2", scope, ISO2);

.... this didn't work either.

Help?

.