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https://issues.apache.org/jira/browse/TRINIDAD-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615376#action_12615376
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Andrew Robinson commented on TRINIDAD-1109:
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The use case for @agent unknown IMO would be much like the HTML <NOFRAMES> or
<NOSCRIPT> tags. It gives the ability for web developers to be able to catch
the use case of notifying the user that they are not supported.
For example:
I write and application that only support FF3 because I am an open source geek.
Now, to be "friendly" to users, I create a page to let non FF3 users know that
their browser stinks and is not secure.
In that page, I can either (1) use a bunch of custom CSS style classes to style
the page in the Trinidad skin, (2) use inlineStyle on the page or (3) use
@agent to target the browser.
Of the 3 options, #3 is the most maintainable and extentable. By this I mean
that I can (1) create more error pages or unsupported pages than one without
having to re-skin them, (2) I don't have to maintain possibly large numbers of
CSS classes for unsupported browsers, the components are skinned correctly and
(3) I have one place to make changes to these pages if I want to completely
redo them.
I don't think that the use case would be very frequent, but in the same regard
that NOFRAMES and NOSCRIPT have a place, I think a notion of an unsupported or
unknown @agent has a place as well.
Well that is my 2 cents.
> Support non-standard user agents
> --------------------------------
>
> Key: TRINIDAD-1109
> URL: https://issues.apache.org/jira/browse/TRINIDAD-1109
> Project: MyFaces Trinidad
> Issue Type: Bug
> Components: Skinning
> Affects Versions: 1.0.8-core, 1.2.8-core
> Environment: User agent string: Mozilla/5.0 (compatible;
> Konqueror/3.5; Linux) KHTML/3.5.9 (like Gecko)
> Reporter: Alexey Stukalov
>
> Trinidad should be able to render the request for non-supported user agents.
> Since 1.x.9 version, user agent's version is mandatory.
> If user agent is not recognized and its version is not set, exceptions are
> thrown:
> 1) on initial request - "version must be non-null" NPE in
> org.apache.myfaces.trinidad.context.Version._checkNonEmptyString(Version.java:197)
> 2) on subsequent requests - NPE in
> org.apache.myfaces.trinidadinternal.style.cache.FileSystemStyleCache$Key.hashCode(FileSystemStyleCache.java:1131)
> The proposed policy is to provide "default" rendering for those agent's that
> are not recognized/partially recognized (agent type or platform identified,
> but not version etc).
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