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From Sébastien Launay (JIRA) <j...@apache.org>
Subject [jira] Commented: (JCR-1650) XPathQueryBuilder may not handle multiple jcr:deref correctly
Date Mon, 29 Sep 2008 13:00:44 GMT

    [ https://issues.apache.org/jira/browse/JCR-1650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635370#action_12635370
] 

Sébastien Launay commented on JCR-1650:
---------------------------------------

I would like to have this fix backported to the 1.4 branch, possibly in the next release (1.4.6)
as the 1.5 is not planned to be released soon.

> XPathQueryBuilder may not handle multiple jcr:deref correctly
> -------------------------------------------------------------
>
>                 Key: JCR-1650
>                 URL: https://issues.apache.org/jira/browse/JCR-1650
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: jackrabbit-spi-commons, xpath
>    Affects Versions: 1.4, core 1.4.5
>            Reporter: Sébastien Launay
>             Fix For: 1.5
>
>         Attachments: jackrabbit-1.4.x-fix-multiple-jcr-deref-2008-06-16.patch
>
>
> If you have the following tree (inspired from DerefTest) :
> + people
>    + carl (worksfor -> company/microsoft)
>    + frank (worksfor -> company/microsoft)
> + company
>     + microsoft (eotm -> carl)
> The following queries will be translated to :
> testroot/people/frank/jcr:deref(@worksfor, '*')/jcr:deref(@eotm, '*')
> + Root node
> + Select properties: *
>   + PathQueryNode
>     + LocationStepQueryNode:  NodeTest={}testroot Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}people Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}frank Descendants=false Index=NONE
>     + DerefQueryNode:  NodeTest=* Descendants=false Index=NONE
>     + DerefQueryNode:  NodeTest=* Descendants=false Index=NONE
> => Matching carl node
> testroot/people/frank/jcr:deref(@worksfor, '*')/jcr:deref(@eotm, '*')[@jcr:uuid]
> + Root node
> + Select properties: *
>   + PathQueryNode
>     + LocationStepQueryNode:  NodeTest={}testroot Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}people Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}frank Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest=* Descendants=false Index=NONE
>     + DerefQueryNode:  NodeTest=* Descendants=false Index=NONE
>       + RelationQueryNode: Op: NOT NULL Prop=@{http://www.jcp.org/jcr/1.0}uuid
> => Not matching carl node
> testroot/people/frank/jcr:deref(@worksfor, '*')[@jcr:uuid]/jcr:deref(@eotm, '*')[@jcr:uuid]
> + Root node
> + Select properties: *
>   + PathQueryNode
>     + LocationStepQueryNode:  NodeTest={}testroot Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}people Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}frank Descendants=false Index=NONE
>     + DerefQueryNode:  NodeTest=* Descendants=false Index=NONE
>       + RelationQueryNode: Op: NOT NULL Prop=@{http://www.jcp.org/jcr/1.0}uuid
>     + DerefQueryNode:  NodeTest=* Descendants=false Index=NONE
>       + RelationQueryNode: Op: NOT NULL Prop=@{http://www.jcp.org/jcr/1.0}uuid
> => Matching carl node
> testroot/people/frank/jcr:deref(@worksfor, '*')[@jcr:uuid]/jcr:deref(@eotm, '*')
> + Root node
> + Select properties: *
>   + PathQueryNode
>     + LocationStepQueryNode:  NodeTest={}testroot Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}people Descendants=false Index=NONE
>     + LocationStepQueryNode:  NodeTest={}frank Descendants=false Index=NONE
>     + DerefQueryNode:  NodeTest=* Descendants=false Index=NONE
>       + RelationQueryNode: Op: NOT NULL Prop=@{http://www.jcp.org/jcr/1.0}uuid
>     + DerefQueryNode:  NodeTest=* Descendants=false Index=NONE
> => Matching carl node
> This is because XPathQueryBuilder calls NAryQueryNode#removeOperand(QueryNode)
> in order to replace current LocationStepQueryNode with a DerefQueryNode.
> NAryQueryNode#removeOperand(QueryNode) uses internally a List and thus
> relies on Object#equals(Object) for retrieving the object to remove.
> But the equals method is redefined for every QueryNode with a different semantic.
> Then, the call to NAryQueryNode#removeOperand(QueryNode) will not remove the
> wanted operand but the first operand returning true after calling equals in
> ArrayList#remove(Object).

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