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From "Markus Wiederkehr (JIRA)" <server-...@james.apache.org>
Subject [jira] Commented: (MIME4J-77) Decide Whether MimeException should extend IOException
Date Sat, 01 Nov 2008 20:15:44 GMT

    [ https://issues.apache.org/jira/browse/MIME4J-77?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644535#action_12644535
] 

Markus Wiederkehr commented on MIME4J-77:
-----------------------------------------

@Robert:

You are using one Java class (IOException in this case) for two completely unrelated classes
of errors that can occur when loading a message: true I/O errors and parsing errors in case
of malformed messages. This invites the user to be sloppy with the error handling. Or worse,
the user may not even become aware of the fact that there are two classes of errors if he/she
does not study the API carefully enough.

Using only one exception and a subclass instead of two independent exceptions is a bit unconventional,
you said so yourself. It is certainly not what I would expect, but I can live with it.

If you decide to stick to this decision Oleg's patch is a good compromise because it eliminates
the is-a relationship between MimeException and IOException by introducing a third class MimeIOException
that serves as an adapter.

@Oleg:

Please include a getter in MimeIOException to retrieve the underlying MimeException without
having to cast.

I think you should also declare "throws MimeIOException, IOException" where appropriate (Header
and Message). This has the advantage that an IDE like Eclipse can create a catch block for
MimeIOException automatically.

Also your patch does not seem to cover MaxLineLimitException.

> Decide Whether MimeException should extend IOException
> ------------------------------------------------------
>
>                 Key: MIME4J-77
>                 URL: https://issues.apache.org/jira/browse/MIME4J-77
>             Project: JAMES Mime4j
>          Issue Type: Task
>    Affects Versions: 0.4
>            Reporter: Robert Burrell Donkin
>             Fix For: 0.6
>
>         Attachments: mimeex.patch
>
>
> Decide whether MimeException should extend IOException

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