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Date: Thu, 28 Apr 2011 05:45:03 +0000 (UTC)
From: "Lance Norskog (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (LUCENE-3041) Support Query Visting / Walking
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    [ https://issues.apache.org/jira/browse/LUCENE-3041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026129#comment-13026129 ] 

Lance Norskog commented on LUCENE-3041:
---------------------------------------

This is an excellent opportunity to redefine Queries as immutable, which would make query rewriting an order of magnitude safer.

> Support Query Visting / Walking
> -------------------------------
>
>                 Key: LUCENE-3041
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3041
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Chris Male
>            Priority: Minor
>         Attachments: LUCENE-3041.patch, LUCENE-3041.patch, LUCENE-3041.patch, LUCENE-3041.patch
>
>
> Out of the discussion in LUCENE-2868, it could be useful to add a generic Query Visitor / Walker that could be used for more advanced rewriting, optimizations or anything that requires state to be stored as each Query is visited.
> We could keep the interface very simple:
> {code}
> public interface QueryVisitor {
>   Query visit(Query query);
> }
> {code}
> and then use a reflection based visitor like Earwin suggested, which would allow implementators to provide visit methods for just Querys that they are interested in.

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