Andrea Aime wrote:
> Justin Deoliveira ha scritto:
>> Hi all,
>>
>> The BasicFidMapper return a new fid using a UID. In gml / filter, a fid
>> is defined to be an NCName. My problem is the string representation of a
>> UID does not form a valid NCName.
>>
>> So I would like to modify the returned UID slighly so that:
>>
>> 1. It does not contain any non alpha numeric characters ( nameley ":" )
>> 2. It always starts with a letter
>>
>> Replacing the line:
>>
>> return new UID().toString()
>>
>> with:
>>
>> return "fid-" + new UID().toString().replaceAll("\\W","_")
>>
>> does the trick nicley. Does anyone have any objections?
>
> I don't have any, but what if the datastore uses a varchar property
> that's user provided for ids, and the users do provide invalid
> characters or have anyways invalid chars already there in the
> column?
Good point,
>
> Is it possible to find something like urlencoding, that provides
> a two way conversion, and use it in the GML encoder?
> What I mean, datastores are not affected by strange chars afaik,
> so the problem is better handled on the GML side of the equation?
I guess the problem here is to ensure the fid is valid gml involves
changing it on the way out, which is definitley possible. However it
gives the client a different fid. How do we know how to handle fids on
the way in? Like on a subsequent request? Do we always "decode" them?
How do we ensure the encoding is lossless?
Tough problem :). Its like a darned if you do, darned if you dont sort
of thing.
-Justin
>
> Cheers
> Andrea
>
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--
Justin Deoliveira
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The Open Planning Project
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