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https://issues.apache.org/jira/browse/JCR-1200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539111
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Julian Reschke commented on JCR-1200:
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>ok. the 'from' is may be not totally accurate either. i liked your 'compute'
>but i wasn't too happy with
> the default-value... because the default value is something different and
> it's already
> present in the property definition, isn't it ? there is no need to compute
> that one...
Right.
So how about
QValue[] computeAuto[Created]Value(...)
(personally preferring the shorter variant)
> is it meant to be used for both retrieved default-values AND autocreated
> values?
> then it would probably be
>
> computeValues.
As we already have an API to get defaults I'd prefer to do this just for
autocreated values.
> i guess we should also define the behaviour of the method if the
> QPropertyDefinition
> does neither define defaultvalues nor is autocreated... throwing?
Yes. The contract would be that the method should only be called for
autocreated properties, and the implementation then could throw a
RepositoryException otherwise.
> allow SPI implementation to compute default values for autocreated properties
> -----------------------------------------------------------------------------
>
> Key: JCR-1200
> URL: https://issues.apache.org/jira/browse/JCR-1200
> Project: Jackrabbit
> Issue Type: Improvement
> Components: SPI
> Reporter: Julian Reschke
> Assignee: Julian Reschke
> Priority: Minor
>
> Currently, when creating nodes in transient space, JCR2SPI uses hard-wired
> logic trying to populate system generated properties such as jcr:created,
> jcr;uuid and so on.
> This is problematic as
> - it doesn't scale -- it fails for autocreated properties not known to
> JCR2SPI, and
> - the syntax for the defaults may be dependant on the back end, such as legal
> syntax for (UU)IDs.
> Proposal:
> - extend QValueFactory with something like
> QValue computeDefaultValue(QPropertyDefinition)
> - use that in JCR2SPI, getting rid of the currently hard-wired logic.
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