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

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

This should work:

Map map = (Map)(interp.eval("dictToJavaMap(getDictionary())").__tojava__(Map.class));

Heshan Suriyaarachchi wrote:
> 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
> 
> 
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