Subj : RE: WrapFactory.wrapAsJavaObject has null class argument
To   : netscape.public.mozilla.jseng
From : Rod Macpherson
Date : Thu Jul 07 2005 11:12 am

The class argument is a static type "hint" used if security permissions
do not allow wrapping, whatever that means. Regardless, you cannot rely
on it being non-null so the solution is to ignore it and key of the
object only. 


-----Original Message-----
From: Rod Macpherson 
Sent: Thursday, July 07, 2005 9:53 AM
To: Rod Macpherson; mozilla-jseng@mozilla.org
Subject: RE: WrapFactory.wrapAsJavaObject has null class argument

To clarify the question (it is not a common one I am sure of that):

I am supplying a WrapFactory to the engine. The engine independently
calls wrapAsJavaObject with a valid object but a null class. When does
the engine decide to pass a null value as the argument for the class
parameter? 


-----Original Message-----
From: mozilla-jseng-admin@mozilla.org
[mailto:mozilla-jseng-admin@mozilla.org] On Behalf Of Rod Macpherson
Sent: Wednesday, July 06, 2005 12:08 PM
To: mozilla-jseng@mozilla.org
Subject: WrapFactory.wrapAsJavaObject has null class argument

Consider a Map that contains Model objects where both Map and Model
return a Scriptable from my WrapFactory override: 

public Scriptable WrapFactory.wrapAsJavaObject(Context context,
Scriptable scope, Object object, Class klass)

Now consider this reference in JavaScript:

myMap.myModel;

The myMap object is processed by the WrapFactory and klass is
java.util.Map; perfect. The myModel object is then processed but klass
is null; crashes my code. The object looks fine: it's a Model type. How
do I control what gets passed to wrapAsJavaObject?




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