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From Michael Wechner <michael.wech...@wyona.com>
Subject Re: How Does Jack Rabbit Generate Its UUID
Date Wed, 09 Feb 2011 14:45:58 GMT
On 2/9/11 2:32 PM, Alexander Klimetschek wrote:
> On 09.02.11 15:25, "Carlo Camerino"<carlo.camerino@gmail.com>  wrote:
>
>> is there anyway that I could relate this UUID to the filename?
>> how does jackrabbit compute what file name to fetch  based on the UUID
>> attribute ?
> Why do you want to do that?

I could imagine applying JCR to an existing file system (e.g. SVN layer)

AFAIK http://jackrabbit.apache.org/jackrabbit-spi.html allows to do 
something like this.

Or do I misunderstand Jackrabbit SPI?

Thanks

Michael
> The generation of the UUID is implementation specific. You can get it with
> getUUID() (for mix:referenceable nodes) or with getIdentifier() (in JCR
> 2.0). But in most cases when you model content or use the JCR API you want
> to use paths instead of UUIDs:
> http://wiki.apache.org/jackrabbit/DavidsModel#Rule_.237:_ID.27s_are_evil.
>
> And how nodes and properties are stored on the file system is an
> implementation detail of the persistence manager. You should use the JCR
> API to access things, just as you don't access the database files of a
> RDBMS.
>
> Regards,
> Alex
>


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