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From "Chris Male (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3041) Support Query Visting / Walking
Date Fri, 22 Apr 2011 14:12:05 GMT
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


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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