Re: To stupid to live??? Problems with coercing non-numeric types.

The approach Jack suggested seems to distort the fact that we're dealing 
with an object, not a string.  Even though it's an object that wraps a 
string, it's still not a string.

However, if you implemented an __str__ method, it should be possible to 
convert it to a string or java.lang.String object.  How about:

x.myMethod(y, str(z))

or

from java.lang      import String
s = String(str(z))
x.myMethod(y, s)

My guess is that it's too much of a leap to go from a Jython object that 
wraps a string to a Java object the wraps a string.  With a little help, 
like that shown above, you should be able to bridge the gap.

Regards,
Todd Moyer



Alex Pollitt wrote:
> Hi all,
>
> Apologies if I'm being too stupid to live, but I'm having problems 
> calling Java methods from within Jython.
>
> Specifically I have a method that takes a string one of its parameters.  
> I can call this fined from python if I pass in a string literal:
>
>         x.myMethod(y, "a string")
>
> But, if I pass in a python object:
>
>       z = Z("a string")
>       x.myMethod(y, z)
>
> Then I have defined then I get "TypeError: myMethod(): 2nd arg can't be 
> coerced to String".
>
> Z is a very simple wrapper class that wraps a string.  (In my real code 
> it does more then this, but for this example all it does is wrap a string.)
>
>       class StringValue:
>           def __init__(self, text):
>               self.text = text
>               return
>
>           def __repr__(self):
>               return repr((str(self.__class__), self.text))
>
>           def __str__(self):
>               return self.text
>
>           def __coerce__(self, other):
>               try:
>                   result = coerce(str(self), other)
>               except TypeError:
>                   result = None
>               return result
>
> So all of the following work fine with Z:
>
>       print z                 #calls z.__str__()
>       print repr(z)                   #calls z.__repr__()
>       print "z is " + z + "."         #calls z.__coerce__()
>
> But the x.myMethod(y, z) does not work, and does not call z.__coerce__() 
> either.
>
> Any help much appreciated!
>
> Thanks in advance,
> Alex.





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