jcr:deref in xpath predicates
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Key: JCR-977
URL: https://issues.apache.org/jira/browse/JCR-977
Project: Jackrabbit
Issue Type: Improvement
Components: query
Affects Versions: 1.3
Environment: n/a
Reporter: Frederic Esnault
Fix For: 1.3.1, 1.4
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_LOCATION.
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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