/*
 * 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.
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/**
 * Necessary classes to implement query builders.
 *
 * <h2>Query Parser Builders</h2>
 * <p>
 * The package <tt>org.apache.lucene.queryParser.builders</tt> contains the interface that
 * builders must implement, it also contain a utility {@link org.apache.lucene.queryparser.flexible.core.builders.QueryTreeBuilder}, which walks the tree
 * and call the Builder for each node in the tree.
 * Builder normally convert QueryNode Object into a Lucene Query Object,
 * and normally it's a one-to-one mapping class.
 *
 * But other builders implementations can by written to convert QueryNode objects to other non lucene objects.
 */
package org.apache.lucene.queryparser.flexible.core.builders;