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From "Nacho G. Mac Dowell (JIRA)" <commons-...@jakarta.apache.org>
Subject [jira] Commented: (JELLY-201) NotAvailableTag
Date Tue, 15 Feb 2005 09:35:13 GMT
     [ http://issues.apache.org/jira/browse/JELLY-201?page=comments#action_59199 ]
     
Nacho G. Mac Dowell commented on JELLY-201:
-------------------------------------------

Hi, what I was looking for is the negative version of util:available. If ant:available exists,
maybe util:available is not recommended? The util:available tag accepts a file and an uri.
I suppose the ant:available doesn't provide the same functionality? The thing is that there
are quite a few places I've seen where mkdir gets called regardless if the directory exists.
While the overhead is not a problem, I think that it would improve readability of jelly scripts.

Thanks,

Nacho

> NotAvailableTag
> ---------------
>
>          Key: JELLY-201
>          URL: http://issues.apache.org/jira/browse/JELLY-201
>      Project: jelly
>         Type: Improvement
>   Components: taglib.util
>     Reporter: Nacho G. Mac Dowell
>  Attachments: NotAvailableTag.patch, NotAvailableTag.patch, UtilTagLibrary.patch, suite.jelly.patch
>
> It would be useful to have a NotAvailableTag. Even though (for example) mkdir can be
called each time without any overhead, sometimes the code would improve readability with the
use of this tag.
> Solution:
> Create a method boolean isAvailable() in AvailableTag which does all the job and have
the NotAvailableTag extend AvailableTag and in the doTag method:
>         if (!isAvailable()) {
>             invokeBody(output);
>         }

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