[Jython-dev] Re: [Jython-users] PyDictionary and Java Hashtables

[<bc...@wo...>]

[Fred Sells on jython-users. I moved it to jython-dev because my reply
concern the development of jython]

>I'm using the python function call
>
>foo(**settings) to allow any options to be set in the call.
>
>foo then calls javabar(settings) where
>
>public void javabar(PyDictionary dictionary)

There is no garantee that the **setting object is a PyDictionary. It can
also be a PyStringMap or a PyInstance.

>I would like to convert dictionary to a Hashtable without stepping through
>all the elements.  Is there a way?

Not at the moment, but first I want to make sure I understand your
request correctly. From java you want to something like:

   PyObject o = ... // Assigned from some python code.
   Hashtable h = Py.py2hashtable(o);

If we decide to add a method like Py.py2hashtable(..), what should it
do? Here is my take (completely untested):

   public static Hashtable py2hashtable(PyObject o) {
        Hashtable htable = new Hashtable();
        Class Class = Object.class;

        PyObject keys = o.invoke("keys");

        int len = key.__len__();
        for (int i = 0; i < len; i++) {
            PyObject key = keys.__finditem__(i);
            PyObject value = o.__finditem__(key);
            htable.put(Py.tojava(key, oClass),
                       Py.tojava(value, oClass));
        }
        return htable;
    }


regards,
finn