--- /dev/null
+package org.apache.lucene.queryParser.core.builders;
+
+/**
+ * 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.
+ */
+
+import org.apache.lucene.queryParser.core.QueryNodeException;
+import org.apache.lucene.queryParser.core.nodes.QueryNode;
+
+/**
+ * This interface is used by implementors classes that builds some kind of
+ * object from a query tree.
+ *
+ * @see QueryTreeBuilder
+ */
+public interface QueryBuilder {
+
+ /**
+ * Builds some kind of object from a query tree.
+ *
+ * @param queryNode
+ * the query tree root node
+ *
+ * @return some object generated from the query tree
+ *
+ * @throws QueryNodeException
+ */
+ Object build(QueryNode queryNode) throws QueryNodeException;
+
+}