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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