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https://issues.apache.org/jira/browse/JCR-977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger updated JCR-977:
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Summary: jcr:deref and parent axis in xpath predicates (was: jcr:deref in
xpath predicates)
Adjusted summary.
> jcr:deref and parent axis in xpath predicates
> ---------------------------------------------
>
> Key: JCR-977
> URL: https://issues.apache.org/jira/browse/JCR-977
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: jackrabbit-core, jackrabbit-spi-commons, query
> Environment: n/a
> Reporter: Frederic Esnault
> Assignee: Marcel Reutegger
> Fix For: 2.0-alpha4
>
> Attachments: deref.patch, deref.patch
>
>
> Currently, the jcr:deref() function is not allowed in a xpath query
> predicate. Example :
> book holds a reference property on its author(s)
> authors have a name
> We want all books from a specific author :
> /jcr:root/element(*, bookType)[jcr:deref(@author, 'authorType')/@name =
> 'King']
> This fails with an InvalidQueryException currently (not supported).
> The error is raised in the XPathQueryBuilder class, in function : private
> QueryNode createFunction(SimpleNode node, QueryNode queryNode), in the block :
> else if (NameFormat.format(JCR_DEREF, resolver).equals(fName))
> Problem is that with this query, when evaluating the jcr:deref() function,
> then in this method at this point, queryNode.getType() is 0 and tests raise
> the exception if queryNode.getType() is neither QueryNode.TYPE_LOCATION nor
> QueryNode.TYPE_PATH.
> I think this is a useful place to put a deref function in a query, as I don't
> know how we could test the referenced node properties another way.
> Frederic Esnault
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