Re: [Jython-users] Jython dictionary implementation

[Jeff E. <jem...@fr...>]

The Iterator returned by the Set returned by keySet() calls
toJava on the PyObject in Iterator.next().

* PyMapSet serves as a wrapper around Set Objects returned by the 
java.util.Map interface of
* PyDictionary. entrySet, values and keySet methods return this type for 
the java.util.Map
* implementation. This class is necessary as a wrapper to convert 
PyObjects to java Objects for
* methods that return values, and convert Objects to PyObjects for 
methods that take values. The
* translation is necessary to provide java access to jython dictionary 
objects. This wrapper also
* provides the expected backing functionality such that changes to the 
wrapper set or reflected in
* PyDictionary.


To get the unconverted PyObjects, you can call __iter__().

joh...@no... wrote:
>
> Hello,
>
> I’m making a call to a Python function that returns a dictionary 
> (string -> dictionary), i.e.
>
> a= {}
>
> a[‘blah’]= { ‘active’: True }
>
> The Java code seems a bit odd. Here’s the call to return the dict a:
>
> Map<PyObject,PyObject> status = 
> (Map<PyObject,PyObject>)f.__call__(params);
>
> And then I can iterate through the keys:
>
> Iterator i = status.keySet().iterator();
>
> while (i.hasNext())
>
> {
>
> String key = (String)i.next();
>
> System.out.println("K "+key+" "+key.getClass());
>
> I would expect K to be PyObject, but it’s String. I would expect to 
> write the Iterator as:
>
> Iterator<PyObject> i = status.keySet().iterator();
>
> while (i.hasNext())
>
> {
>
> PyObject key = (PyObject)i.next();
>
> So, what’s Jython doing as it’s a little confusing!
>
>
> John
>
> -- 
>
> John Baker,
>
> JEE Architect, London Web Technology.
>
>
>
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