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From Sébastien Brisard (Created) (JIRA) <j...@apache.org>
Subject [jira] [Created] (MATH-755) On the contract of FieldElement<T>.divide(T)
Date Sun, 26 Feb 2012 17:56:48 GMT
On the contract of FieldElement<T>.divide(T)
--------------------------------------------

                 Key: MATH-755
                 URL: https://issues.apache.org/jira/browse/MATH-755
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: 3.0, 3.1
            Reporter: Sébastien Brisard
            Assignee: Sébastien Brisard
            Priority: Minor
             Fix For: 3.1


As discussed on the mailing list:
{quote}
The contract of {{FieldElement<T>.divide(T)}} states that an {{ArithmeticException}}
should be thrown if the parameter is zero. However, for this boundary case
* {{BigFraction}} throws {{ZeroException}}
* {{ArithmeticException}} throws {{ArithmeticException}}
* {{Complex}} uses NaNs instead of exceptions
* {{Dfp}}, {{DfpDec}} use flags instead of exceptions
* {{Fraction}} throws {{MathArithmeticException}}.
{quote}

There is a need for some cleaning up, which will proceed in two steps
# in version 3.0 of the {{FieldElement}} interface the statement that an exception must be
thrown will be removed. The rationale for this is that sometimes, an exception is actually
not wanted. For example, I'm using a wrapper around primitive {{double}}, and I want all boundary
cases to be handled _exactly_ the same way as the primitive operation "/").
# in version 3.1 of Commons Math, the _same_ exception (if any) will be thrown by all implementations.
This will require to chose between {{ArithmeticException}}, {{MathArithmeticException}} and
{{ZeroException}}.

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