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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3041) Support Query Visting / Walking
Date Mon, 02 May 2011 10:27:03 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027612#comment-13027612
] 

Earwin Burrfoot commented on LUCENE-3041:
-----------------------------------------

The static cache is now not threadsafe.
And original had nice diagnostics for ambigous dispatches. Why not just take it and cut over
to JDK reflection and CHM?

> Support Query Visting / Walking
> -------------------------------
>
>                 Key: LUCENE-3041
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3041
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 4.0
>            Reporter: Chris Male
>            Assignee: Simon Willnauer
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-3041.patch, 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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