[Jython-users] FW: Java - Jython Numeric comparisons

[George Y. <gy...@cn...>]

Hello,
I'm implementing an auditing system with a framework written in Java and =
a customization level written in Jython.  The customization level often =
pulls numeric values from the framework and may manipulate or compare =
those values and put them back.  The values are of various numeric types =
(Integer, Long, BigInteger, BigDecimal) and may be compared against =
Python literals.  I have the following scenario:

1) A java.lang.Long is retrieved as a Python long
2) the Python long is set back into the framework (which makes it a =
java.math.BigInteger)
3) the java.math.BigInteger is retrieved as a wrapped instance
4) I try to compare the wrapped instance against a Python literal (which =
returns an arbitrary result)

The progression of the types is transparent up until the comparison, and =
other math like addition and subtraction would still work since =
PyLong.__add__ attempts coercion.  Here's a simpler example that =
demonstrates the case:
>>> from java.util import *
>>> jythonLong =3D 3L
>>> print jythonLong > 0
1
>>> v =3D Vector()
>>> v.add(jythonLong)
1
>>> javaLong =3D v.get(0)
>>> print javaLong > 0
0
>>> print javaLong.__class__
java.math.BigInteger
>>> print jythonLong.__class__
org.python.core.PyLong
>>>
=20
I was wondering if it made sense to have PyLong and PyInteger attempt =
coercion for comparisons?  If not, or in the interim, does anyone have a =
suggestion on how to deal with this issue? =20