add generics support to Builder annotation

[kai.m...@gmail.com]

Hi,

I'm currently trying to generate Builder classes. I was able to reconstruct the type hierarchy of my beans in the corresponding Builder hierarchy too. E.g. Foo<Concrete> extends Bar<T>, then FooBuilder<Concrete> extends BarBuilder<T> too.

Now I was trying to generate the Builder fields and methods too. But I couldn't achieve to generate fields and methods with the generic type T ;-(. I wanted to have one Builder method that accepts a list of T and one convenience method that simply adds T to the existing list of values. So my active annotation looks like this:

 

   val builder = (qualifiedName + "Builder").findClass
    builder => [
        builtFields.forEach [ builtField |
            addField(builtField.simpleName, [
                type = builtField.type
            ])
        ]
        addMethod(builtField.simpleName) [
            addParameter(builtField.simpleName, builtField.type)
            ...
        ]
        if (builtField.type.isAssignableFrom(typeof(List).newTypeReference)) {
            addMethod(builtField.simpleName, [
                val paramName = builtField.getListParameterSimpleName
                val paramType = builtField.type.actualTypeArguments.get(0)
                docComment = paramType.toString
                addParameter(paramName, paramType)
                ...
            ])
        }
        ...
    ]

   
In my example class :

 

   class AppendableList<T> {

        List<T> values
       
    }

I only get something like this (which doesn't compile):

    private List<?> values;

    public AppendableListBuilder values(final List<?> value) {
        ...
    }

    /**
     * T
     */
    public AppendableListBuilder values(final ? value) {
        ...
    }

It seems that the generic information T is somehow lost? But the javadoc still has this information?!? Btw: this also happens in the Builable annotation from xtend-contrib. Is there any chance to enhance xtend to remain the generic info in the TypeDeclaration? Or is there any trick I missed?

Thx and Regards
Kai