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Posted to dev@jackrabbit.apache.org by "Sébastien Launay (JIRA)" <ji...@apache.org> on 2008/09/29 15:00:44 UTC
[jira] Commented: (JCR-1650) XPathQueryBuilder may not handle
multiple jcr:deref correctly
[ 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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