Register a custom type converter (is it possible)?

[Paulo Lopes]

That is what I was trying to avoid. In the java side I'd like to have
specific types `Bar` so i get type safety, compile time validation, etc...
all the things you expect from a strongly typed language, and on Nashorn
side I'd like to have the freedom of dynamic typed languages, also if my
contract is already deployed I'd break the whole compatibility/contract by
changing the method signatures to be Map.

I was trying to get my head around the dynalink stuff but sadly it does not
apply to this problem.



On Mon, Jun 20, 2016 at 2:58 PM, Sundararajan Athijegannathan <
sundararajan.athijegannathan at oracle.com> wrote:

> No, there are no such conversion hooks.
>
> But, if any of your Java methods accept java.util.Maps, you can pass
> script objects.  Also, if any of your Java methods accept List or Java
> arrays, you can pass script arrays.
>
> var m = new java.util.HashMap();
>
> m.putAll({ foo: 44 });
>
> var l = new java.util.ArrayList();
>
> l.addAll([44, 546, 676]);
>
> -Sundar
>
> On 6/20/2016 5:43 PM, Paulo Lopes wrote:
> > Hi,
> >
> >
> > I've been reading the documentation, wiki and the examples from Nashorn
> and
> > have a question that I cannot find a yes/no answer to. Say for example
> that
> > I've an application that leverages on Nashorn for JavaScript execution
> but
> > its core is in Java. In my Java code I've a interface like:
> >
> > interface Foo {
> >
> >   void doSomething(Bar bar);
> >
> > }
> >
> >
> > Now from Nashorn I'd like to invoke the method "doSomething" like:
> >
> >
> > foo.doSomethin({key: 'value'});
> >
> >
> > As expected this won't work since Nashorn does not know how to cast from
> > "JSObject" to "Bar" however I'd like to register somewhere/somehow (this
> is
> > what I don't know) a helper class/method/something where I could do
> this. I
> > also do not want to bring Nashorn API/types to Java to I'm not looking
> for
> > something like:
> >
> >
> > class Bar implements JSObject { ... }
> >
> >
> > Is this possible? and it is possible with JDK8?
> >
> >
> > Thanks!
> > Paulo
>
>


-- 
Paulo Lopes
www.jetdrone.com