We even have an open Jira for it at
https://osgeo-org.atlassian.net/browse/GEOT-4715 :-)
I like all of the options - the purist in me leans to a - but I can see
that is a hassle to implement.
Of the others I think C - the list - is a cleaner and more extensible
option. It looks like the easier option to handle at the user level.
my 2p
Ian
On Tue, Jul 7, 2015 at 10:05 AM Andrea Aime <[email protected]>
wrote:
> Hi,
> when creating a datastore, if we pass a set of invalid params to a
> specific factory,
> we get back useful exceptions, telling us that the connection could not be
> made,
> the file was not found, the caps document was invalid, and so on.
>
> When doing the same with a coverage Format object, we get back... squat!
> Just a null value indeed.
>
> I want to propose we get back something useful instead that we can
> communicate
> to a user (skilled enough to read an exception, but still).
> Options:
> a) Break API behavior and add the ability to throw an Exception to
> Format.getReader.
> For example, throw an IOException.
> This won't break the implementors, but it will break the users of the
> library
> b) Add a progress listener as a Hint in Format.getReader(object, hints),
> and make the
> readers that want to be helpful set an exception in the progress (and
> maybe also
> return progress if they want to, getting a reader might require time,
> it sure does
> with the mosaic)
> c) Add a hint with an empty List<Exception> that the store will populate
> with all
> exceptions it sees fit. Exceptions could be populated also if
> returning a reader,
> for example with the mosaic we could return a mosaic but for example
> collect exceptions
> for the granules that we could not parse
>
> Weighting pros and cons of all the cases, I'm torn between b) and c)
> a) is how the API should have been designed from day 1, but doing that
> change now
> is going to break so many users that I'm not so eager to go that way...
> but I'm willing
> to be talked into adopting it anyways ;-)
>
> Cheers
> Andrea
>
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