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From "Szymon Kuzniak (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-591) XPath position function does not work
Date Mon, 16 Oct 2006 11:42:36 GMT
    [ http://issues.apache.org/jira/browse/JCR-591?page=comments#action_12442559 ] 
Szymon Kuzniak commented on JCR-591:

I was working a bit on this issue, and found out that Lucene is used to search for nodes,
and position of node is not indexed. So I decided to fix this issue by adding Node.getIndex
to Lucene document, as a field named "position", and add to Lucene query new TermQuery. After
this operation position() started to work, but after deleting some node it returned malformed
For example:
Node n1 = testRootNode.addNode("node1");
Node n2 = testRootNode.addNode("node2");
Node n3 = testRootNode.addNode("node1");
Node n4 = testRootNode.addNode("node1");
Node n5 = testRootNode.addNode("node1");
Node n6 = testRootNode.addNode("node1");
Node n7 = testRootNode.addNode("node1");
Query q = qm.createQuery("//node1[position()=3]", Query.XPATH);
assertEquals(n4, iter.nextNode()); <- passed
q = qm.createQuery("//node1[position()=3]", Query.XPATH);
assertEquals(n4 iter.nextNode()); <- passed
assertEquals(n5, iter.nextNode()); <-did not pass
The reason I quess, is that adjacent nodes with the same name as deleted node are not reindexed
after this operation.
So, my question is: is the approach with indexing position of node ok to you? Should I try
to reindex the adjacent nodes after delete of node?

regards Simon

> XPath position function does not work
> -------------------------------------
>                 Key: JCR-591
>                 URL: http://issues.apache.org/jira/browse/JCR-591
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: query
>    Affects Versions: 1.0.1
>            Reporter: Przemo Pakulski
>            Priority: Minor
> Expression with position function are supported in XPath but does not work. 
> All rows are returned when equality operator is used.
> 	public void testXPathPosition() throws Exception {
> 		Node foo = testRootNode.addNode("name");
> 		Node bar = testRootNode.addNode("name");
> 		testRootNode.save();
> 		String xpath = "//name[position()=2]";
> 		Query q = superuser.getWorkspace().getQueryManager().createQuery(xpath, Query.XPATH);
> 		QueryResult result = q.execute();
> 		checkResult(result, 1);
> 		checkResult(result, new Node[]{bar});
> 	}

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