On May 13, 1:41 pm, [EMAIL PROTECTED] wrote:
> On Apr 24, 8:17 pm, [EMAIL PROTECTED] wrote:
>
>
>
> > The exception actually happens at the "Child.prototype.foo =" part.
>
> > On Apr 24, 2:26 pm, [EMAIL PROTECTED] wrote:
>
> > > I am having trouble properly extending Java classes with Rhino.
>
> > > I am using the Mozilla version of Rhino and not the builtin version
> > > with Java 6.
>
> > > ------------------------ Java code to extend
> > > ---------------------------------
> > > public class Test {
>
> > > public int value = 4;
>
> > > public void foo() {
> > > System.out.println(this.value);
> > > }
>
> > > }
>
> > > ------------------------ Javascript code
> > > ---------------------------------
>
> > > // Wrap the Java class into an adapted Javascript constructor
> > > function Parent() {
> > > return new JavaAdapter(Test, this);
>
> > > }
>
> > > // Define a constructor for Child()
> > > function Child() {
>
> > > }
>
> > > // Copy the parent's prototype into the child prototype
> > > Child.prototype = new Parent();
>
> > > // Override the java version of foo()
> > > Child.prototype.foo = function() {
> > > this.value = 1;
>
> > > // call the "super" java version of this method
> > > Parent.prototype.foo.call(this);
>
> > > }
>
> > > // Create an instance and test method
> > > var t = new Child();
> > > t.foo(); <------ Exception gets thrown here
>
> > > ----------- Error message from Rhino ------------------------
>
> > > Java method "foo" cannot be assigned to. (#14)
>
> > > This code works when modified to be totally Javascript based. I don't
> > > believe it's an issue with the Javascript part. Am I going about this
> > > the wrong way? Is it possible to actually extend Java classes?
>
> > > Thank you for you help.
>
> Great, thanks for the help guys. Since Rhino is apparently incapable
> of such a simple feature, I will look elsewhere for scripting support.
Sorry we missed replying to your question. For the record I'd suggest
looking at JavaAdapter, see http://www.mozilla.org/rhino/scriptjava.html.
This allows you to implement interfaces and extend Java classes.
--N
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