Making a Java library "Groovy"

Question

I fell in love with Groovy and try to use it more and more. Now I have to work with Oracle Forms Jdapi library. When working with this library, you write a lot of code like this:

JdapiIterator progIterator = getWorkForm().getProgramUnits();
while(progIterator.hasNext()) {
    ProgramUnit currProgUnit = (ProgramUnit) progIterator.next();
    ...
}

and of cource I would like to write

getWorkForm().programUnits.each {
    ...
}

However, I never wrote a Groovy interface to an existing Java library and need some assistance. I know about Groovy 2.0's extension methods, but in that case I am thinking about a class with the same name in a different namespace which delegates only to the functions I would like to keep.

What is the best approach for providing the each functionality, but also all other closures applicable for collections? I would appreciate if you point me in the right direction!

Answer 1

The only method you need to provide is the iterator() method. You then get all of the Groovy Object iteration methods (each(), find(), any(), every(), collect(), ...) for free!