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From "Chris Male (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3041) Support Query Visting / Walking
Date Sat, 23 Apr 2011 14:26:07 GMT


Chris Male commented on LUCENE-3041:

Yup I have a patch cooking.  

bq. Stuff like automatic dispatch for certain query types might need some cglib magic or at
least req. java 6 to perform so they might need to go to contrib/misc.

I don't think this will be the case.  I am striving to use Java 5 reflection classes and that
seems to be working fine.

> Support Query Visting / Walking
> -------------------------------
>                 Key: LUCENE-3041
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Chris Male
>            Priority: Minor
> 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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