[GitHub] [lucene-solr] romseygeek commented on a change in pull request #581: LUCENE-3041: QueryVisitor

[GitBox <gi...@apache.org>]

romseygeek commented on a change in pull request #581: LUCENE-3041: QueryVisitor
URL: https://github.com/apache/lucene-solr/pull/581#discussion_r261992679
 
 

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 File path: lucene/core/src/java/org/apache/lucene/search/QueryVisitor.java
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 @@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.lucene.search;
+
+import java.util.Arrays;
+import java.util.Set;
+
+import org.apache.lucene.index.Term;
+
+/**
+ * Allows recursion through a query tree
+ *
+ * @see Query#visit(QueryVisitor)
+ */
+public abstract class QueryVisitor {
+
+  /**
+   * Called by leaf queries that match on a specific term
+   *
+   * @param query  the leaf query
+   * @param terms  the terms the query will match on
+   */
+  public void consumeTerms(Query query, Term... terms) { }
 
 Review comment:
   I think we do want it, otherwise you can't tell the difference between for example a TermQuery and a SpanTermQuery

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