Re: [Jython-users] Getting Python-like dictionaries?

[Jeff E. <je...@ad...>]

This works for me:

Foo.java:
public class Foo {
   java.util.Hashtable table = new java.util.Hashtable();
   public Object __setitem__(Object key, Object value) {
     System.out.println("in Foo.__setitem__ " + key + " " + value);
     table.put(key,value);
     return value;
   }
   public Object __getitem__(Object key) {
     System.out.println("in Foo.__getitem__ " + key);
     return table.get(key);
   }
}

Jython 2.1 on java1.4.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
 >>> import Foo
 >>> f=Foo()
 >>> f['a']='b'
in Foo.__setitem__ a b
 >>> f['b']
in Foo.__getitem__ a
'b'
 >>>



James Carroll wrote:

> I just tried implementing the __getitem__ and __setitem__ as java
> methods, hoping that Jython would use them, and no luck
> 
> 
>>>>nii.getAttributesAsXML()
>>>>
> '<?xml version="1.0"?><attributes> <attribute name="relative filename"
> value="mbf.gif"/> <attribute name="resolution_x"
> value="1.0"/></attributes>'
> 
>>>>nii.__getattr__("relative filename")
>>>>
> 'mbf.fpx'
> 
>>>>nii.__setattr__("relative filename", "fish.gif")
>>>>
> 'fish.fpx'
> 
>>>>nii.__getattr__("relative filename")
>>>>
> 'fish.fpx'
> 
>>>>nii.getAttributesAsXML()
>>>>
> '<?xml version="1.0"?><attributes> <attribute name="relative filename"
> value="fish.fpx"/> <attribute name="resolution_x"
> value="1.0"/></attributes>'
> 
>>>>nii['relative filename']
>>>>
>>>>
> 
> This should have returned the 'fish.gif' as a string, but no such
> luck... does anyone have an idea if this is possible?
> 
> 
> My Java code looks like:
> class NII 
> {...
> 
>     // some Jython accessors for treating this like a Python Dictionary
>     public String __getattr__(String name)
>     {
>         NamedParameter np = getAttribute(name);
>         return np.getValueString();
>     }
> 
>     public String __setattr__(String name, String value)
>     {
>         NamedParameter np = getAttribute(name);
> 	  np.setValueString(name, value)
>         return value;
>     }
> 
> }
> 
> 
> 
>>-----Original Message-----
>>From: Jeff Emanuel [mailto:je...@ad...] 
>>Sent: Tuesday, May 28, 2002 12:35 PM
>>To: Dinu Gherman
>>Cc: jyt...@li...
>>Subject: Re: [Jython-users] Getting Python-like dictionaries?
>>
>>
>>
>>But this won't let you change the py dict and have the
>>changes affect the nsDict.  You might want to wrap the nsDict 
>>with a python class sort of like this:
>>
>>class Wrapper:
>>   def __init__(self,nsDict):
>>     self.nsDict=nsDict
>>   def __getitem__(self,key):
>>     return self.nsDict.objectForKey(key)
>>   def __setitem__(self,key,value):
>>     self.nsDict.setObjectForKey(key,value)
>>
>>pyDict = Wrapper(nsDict)
>>
>>
>>
>>Dinu Gherman wrote:
>>
>>
>>>Yep, it turns out the following code gets the job done 
>>>
>>(nasty imports 
>>
>>>omitted ;-):
>>>
>>>    def convertNSDictionaryToPyDict(nsDict):
>>>        "Convert an NSDictionary to a Jython Dictionary."
>>>    
>>>        myPool = NSAutoreleasePool.push()
>>>    
>>>        dict = {}
>>>        keyEnum = nsDict.keyEnumerator()
>>>        while keyEnum.hasMoreElements():
>>>            k = keyEnum.nextElement()
>>>            dict[k] = nsDict.objectForKey(k)
>>>    
>>>        NSAutoreleasePool.pop(myPool)
>>>    
>>>        return dict
>>>
>>>Thanks, Samuele and Danny!
>>>
>>>Dinu
>>>
>>
>>
>>_______________________________________________________________
>>
>>Don't miss the 2002 Sprint PCS Application Developer's 
>>Conference August 25-28 in Las Vegas -- 
>>http://devcon.sprintpcs.com/adp/index.cfm
>>
>>
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>>
>>
> 
> _______________________________________________________________
> 
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> August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm
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