[jira] Commented: (JCR-740) Support for the decendant-or-self axis in XPath predicates

["Marcel Reutegger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JCR-740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12507833 ] 

Marcel Reutegger commented on JCR-740:
--------------------------------------

Well, the problem with the current implementation is how the path is stored in the abstract query tree. Because it uses a Path instance in RelationQueryNode other axis than child are not possible currently. The correct solution is probably to replace the Path with a full fledged PathQueryNode. Anything else is rather a hack.

> Support for the decendant-or-self axis in XPath predicates
> ----------------------------------------------------------
>
>                 Key: JCR-740
>                 URL: https://issues.apache.org/jira/browse/JCR-740
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: xpath
>    Affects Versions: 1.2.1
>            Reporter: Randy Simon
>         Attachments: patch.txt
>
>
> For example,
> I want to find the root of a node tree that contains a node with a specified id. The child node may be n layers deep in the node tree. In my specific case, I know how deep it is so
> //element(*, my:foo)[bar/*/*/*/*/@jcr:uuid = 'abc']
> finds the node of type my:foo that contains the child node with id 'abc'.
> Now, I would like to generalize this so I thought i could simply do the following.
> //element(*, my:foo)[bar//*/@jcr:uuid = 'abc']
> but this does not work.

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