http://lucene.apache.org/lucene-parent/lucene-queryparser: Lucene QueryParsers module (The Apache Software Foundation) 
/*
 * 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.
 */
 

Implementation of the Lucene classic query parser using the flexible query parser frameworks 
Lucene Flexible Query Parser Implementation



The old Lucene query parser used to have only one class that performed 
all the parsing operations. In the new query parser structure, the 
parsing was divided in 3 steps: parsing (syntax), processing (semantic)
and building.


The classes contained in the package org.apache.lucene.queryParser.standard
are used to reproduce the same behavior as the old query parser.

 Check StandardQueryParser to quick start using the Lucene query parser. 
/** 
 * Implementation of the {@linkplain org.apache.lucene.queryparser.classic Lucene classic query parser} using the flexible query parser frameworks
 * 
 * <h2>Lucene Flexible Query Parser Implementation</h2>
 * <p>
 * The old Lucene query parser used to have only one class that performed 
 * all the parsing operations. In the new query parser structure, the 
 * parsing was divided in 3 steps: parsing (syntax), processing (semantic)
 * and building.
 * <p>
 * The classes contained in the package org.apache.lucene.queryParser.standard
 * are used to reproduce the same behavior as the old query parser.
 * 
 * <p>
 * Check {@link org.apache.lucene.queryparser.flexible.standard.StandardQueryParser} to quick start using the Lucene query parser.
 */
package org.apache.lucene.queryparser.flexible.standard;