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