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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-542) Allow the addition of multiple messages to the exceptions generated by CM
Date Sun, 06 Mar 2011 17:35:25 GMT

    [ https://issues.apache.org/jira/browse/MATH-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003190#comment-13003190
] 

Gilles commented on MATH-542:
-----------------------------

Of course an object like "ExceptionContext" could store arbitrary (key, value) pairs.
But if users want to use "ExceptionContext", they can use the real thing ;-) i.e. depend on
[Lang] for that functionality. We don't need that _in_ CM.
What we need to do in CM is provide a fully informative localized message. I know it is a
burden for users to implement "Localizable" but, IIRC, you said that you were doing exactly
that in your application (because you need localization).
So to achieve that goal in the simplest way, "addMessage" is all that's needed.
Allowing arbitrary types for the key will go in the way of the above goal. Indeed, how do
you localize the message string if you don't have a "Localizable" key? I know that we _could_
do it (with "instanceof") but I think that we wouldn't do a favour to CM users: When some
code layers insert non-localizable messages/objects, it will result in a patchwork of different
languages in the final display. And if we don't display the non-localizable info, then we
contradict part the stated goal (full information).

Again, I recommend to keep it simple at first, until a clear-cut use-case shows that some
functionality is missing.


> Allow the addition of multiple messages to the exceptions generated by CM
> -------------------------------------------------------------------------
>
>                 Key: MATH-542
>                 URL: https://issues.apache.org/jira/browse/MATH-542
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Minor
>              Labels: api-change
>             Fix For: 3.0
>
>
> Borrowing on the idea of "ExceptionContext" implemented in [Lang], "MathRuntimeException"
(base class of all exceptions generated from CM) will be enhanced so that an unlimited number
of (localized) messages can be added to an exception object.
> The "MathThrowable" interface (implemented by "MathRuntimeException") will contain the
following new method:
> {code}
> /**
>   * Sets a message.
>   *
>   * @param pattern Message pattern.
>   * @param arguments Values for replacing the placeholders in the message
>   * pattern.
>   */
>   public void addMessage(Localizable pattern,
>                          Object ... arguments);
> {code}

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