Add query support to JCR source factory
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Key: COCOON-1908
URL: http://issues.apache.org/jira/browse/COCOON-1908
Project: Cocoon
Issue Type: New Feature
Components: Blocks: JCR
Affects Versions: 2.2-dev (Current SVN)
Reporter: Alexander Klimetschek
The current implementation of the JCRSourceFactory is missing the support for
JCR queries (XPath and SQL) and only allows direct paths (like
"jcr://root/folder/file").
I have implemented a simple query handling (see patch). It supports both XPath
(required for JCR Level 1 compliance, thus any JCR implementation) and SQL
(optional JCR feature). The query strings given as Source-URIs must look like
this:
XPath:
jcr://xpath!//root/*
(which maps to the xpath query "//root/*" which is passed on to the JCR Query)
jcr://!//root/*
(which is just a shorthand notation for the above, using Xpath)
SQL:
jcr://sql!select * from nt:base where jcr:path = '/root/myfile'
(well, which maps to the sql query "select * from nt:base where jcr:path =
'/root/myfile'")
There is a restriction for the queries: the result to be returned must be a
content-node with no children and some streamable content. The JCRNodeSource
class does not allow collections to be returned. I am working on subclasses
that will target this issue (using the XMLizable interface) but this is not yet
finished.
I tried to make the patch complete, including updated javadocs for the
JCRSourceFactory class.
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