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From Luc Maisonobe <Luc.Maison...@free.fr>
Subject Re: svn commit: r1034457 - in /commons/proper/math/branches/MATH_2_X/src: main/java/org/apache/commons/math/ main/java/org/apache/commons/math/exception/ main/java/org/apache/commons/math/linear/ main/java/org/apache/commons/math/ode/ site/xdoc/
Date Fri, 12 Nov 2010 20:08:05 GMT
Le 12/11/2010 18:15, Gilles Sadowski a écrit :
> Hello.
> 
>>> MATH-440
>>> New exception "MathUserException" supersedes "FunctionEvaluationException",
>>> "MatrixVisitorException" and "DerivativeException".
>>>
>>> Added:
>>>     commons/proper/math/branches/MATH_2_X/src/main/java/org/apache/commons/math/exception/MathUserException.java
  (with props)
>>
>> Fine, thanks.
>> I'll change the constructors to replace the String with Localizable as
>> per the new localization scheme (which is already in place in 2.X branch).
> 
> Do you think that it is necessary, given that as a user-level exception,
> there won't probably exist an enum element corresponding to the error?

Some users already do have their own implementation of the Localizable
interface, with their own enum. We do have this in Orekit for example.
So users are not restricted to the [math] enums.

Luc

> The only thing would be to add an element
>   USER_GENERATED_EXCEPTION
> and use that string as the message of "MathUserException". I.e. we should
> not provide a string argument to construct a "MathUserException".
> 
> The user will have to unpack the "cause" if he needs access to _his_
> message. So, we should probably only provide *one* constructor (with a
> "Throwable" argument) to make it completely clear that we suggest wrapping
> any user-specific error into a single type in order to ease communication.
> 
> 
> Best regards,
> Gilles
> 
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