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From "Sebb (JIRA)" <>
Subject [jira] [Updated] (NET-392) Use enum for IMAPCommand
Date Sat, 04 Jun 2011 19:31:47 GMT


Sebb updated NET-392:

    Fix Version/s: 3.0

> Use enum for IMAPCommand
> ------------------------
>                 Key: NET-392
>                 URL:
>             Project: Commons Net
>          Issue Type: Sub-task
>            Reporter: Sebb
>             Fix For: 3.0
> As mentioned in the main issue, I think it would be better to use enums instead of int
for the IMAP commands.
> I agree that enums cannot be extended, but as far as I can tell, it won't be easy to
extend the existing method either.
> One can subclass IMAPCommand, but this won't be simple:
> - how to prevent duplication of numbers if the parent class is later extended?
> - how can the method IMAP.sendCommand(int command, String args) know where to pick up
the new entries? 
> At present it references the static method IMAPCommand.getCommand(); it would probably
be necessary to change this to use an instance of IMAPCommand and an instance method, which
could then be overridden.
> Seems to me that allowing extension via subclassing will make the code more complicated
and fragile.
> If new IMAP commands are added, the user can still pass in a String until such time as
the code is updated.
> Whereas if the code is changed to use enums, these can be used to provide additional
validation - e.g. the enums could have an attribute that defines how many parameters are needed;
this could then be checked.

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