Subj : Throwing host exception from host object
To   : netscape.public.mozilla.jseng
From : Larry Blanchette <LBlanchette@Grandcentral.com>
Date : Tue Mar 16 2004 05:35 pm

In rhino, I would like throw from a host object my own scriptable types as
catchable exceptions of "my type" in javascript.  I seems that 

extending EvaluatorException 

and using

Context.throwAsScriptRuntimeEx(ex);

is the path to follow but it does not allow me to propagate my type.  The
exception is caught as either "internalError" in the case of an evaluator
exception and "JavaException" otherwise. Do I need to extend ScriptRuntime
and override getCatchObject(Context cx, Scriptable scope, Throwable t) to
handle and convert my exceptions (didn't want to go there)?

So if have 

class MyExceptionType extends ScriptableObject

and in host object I throw

Context.throwAsScriptRuntimeEx(myScriptable);  // illegal


then i would

try {
	host.causeExceptions();
} catch(exception) {
	if(excetion instanceof MyExceptionType) {
		// got it
	}
}

Thanks

.