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From "Luc Maisonobe (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 19:38:59 GMT

    [ https://issues.apache.org/jira/browse/MATH-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003209#comment-13003209
] 

Luc Maisonobe commented on MATH-542:
------------------------------------

No, users can't use [lang] ExceptionContext on [math] exception if [math] does not provide
the same feature.
The key-value pairs are more general than Localizable-arguments and they may be used for something
different than building a message.

I don't intend to suppress the Localizable-arguments part, just to add the possibility to
add key-values. We could even use this to hold the Localizable and the arguments array if
we want. So an exception would have at least the localizable and the arguments (enforced by
constructor) but also additional parameters. Some of these parameters would be directly injected
by [math] for some specific exceptions (iteration count, out of bound value ...) but the user
could add its own, thus effectively removing some of the use of wrapping. The additional parameters
are not intended to appear in the message, so there would not be a patchwork of languages
in the final display.

The typical use case I have (from my own code) is something like a spacecraft maneuver planning
algorithm that do call an optimizer from [math]. If the optimizer fails, we get some [math]
exception. We just catch it, add some information about the context of the maneuver planning
and throw the same exception again for the top level to catch it and react on the context
information and decide if it can make another try (for example switch to another propulsion
mode) or if it should give up and display the original exception (most of the time without
its context, because when we decide to give up we want to display something more general than
the context of the last attempt only).

> 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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