Re: [Jython-users] java.util.map Compatible data structure in python

[Heshan S. <hes...@gm...>]

On Fri, Apr 25, 2008 at 9:03 PM, Jeff Emanuel <jem...@fr...> wrote:

> That's correct, unfortunately PyDictionary does not
> implement java.util.Map.
>
> You need to copy the dictionary to a Java map before
> passing it to Java code.
>
> def dictToJavaMap(dict):
>  import java
>  javaMap =java.util.HashMap()
>  for i in dict.items():
>   javaMap[i[0]]=i[1]
>  return javaMap
>
> Hi Jeff,
          I used the method above to convert the Dictionary to a Map. When
the method returns a javaMap , I am collecting it using a PyObject (within
my java code).Therefore I have to convert it to a Map.At that moment it
gives a class cast exception. Is there an alternative way of doing this
correctly?


        PySystemState.initialize();
        PythonInterpreter interp = new PythonInterpreter();
        interp.exec("import sys");
        interp.exec("print sys.path");

        String str3 =
"/home/heshan/workspace/IdeaProjects/PYtest/src/essentialScripts/myfile.py";
        interp.execfile(str3);
        PyObject obj = interp.eval("getDictionary()");

        String str4 = "dictToJavaMap(" + obj + ")";
        PyObject obj2 = interp.eval(str4);

        //aDictionary[k].get('operationName')
        //String str = "" + obj + "[].get('operationName')";
        //interp.exec(str);

        Map map = (Map) obj2;
/*
The above line gives a exception like below
Exception in thread "main" java.lang.ClassCastException:
org.python.core.PyJavaInstance cannot be cast to java.util.Map
*/
        Iterator k = map.keySet().iterator();
        while (k.hasNext()) {
            String key = (String) k.next();
            System.out.println("Key " + key + "; Value " +
                    (String) map.get(key));
        }


Thanx in advance
-- 
Regards,
Heshan Suriyaarachchi