lucene/queryparser/src/java/org/apache/lucene/queryparser/flexible/precedence/PrecedenceQueryParser.java

/*
 * 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.queryparser.flexible.precedence;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.queryparser.flexible.standard.StandardQueryParser;
import org.apache.lucene.queryparser.flexible.standard.processors.StandardQueryNodeProcessorPipeline;
import org.apache.lucene.queryparser.flexible.precedence.processors.PrecedenceQueryNodeProcessorPipeline;

/**
 * <p>
 * This query parser works exactly as the standard query parser ( {@link StandardQueryParser} ), 
 * except that it respect the boolean precedence, so &lt;a AND b OR c AND d&gt; is parsed to &lt;(+a +b) (+c +d)&gt;
 * instead of &lt;+a +b +c +d&gt;.
 * </p>
 * <p>
 * EXPERT: This class extends {@link StandardQueryParser}, but uses {@link PrecedenceQueryNodeProcessorPipeline}
 * instead of {@link StandardQueryNodeProcessorPipeline} to process the query tree.
 * </p>
 * 
 * @see StandardQueryParser
 */
public class PrecedenceQueryParser extends StandardQueryParser {
  
  /**
   * @see StandardQueryParser#StandardQueryParser()
   */
  public PrecedenceQueryParser() {
    setQueryNodeProcessor(new PrecedenceQueryNodeProcessorPipeline(getQueryConfigHandler()));
  }
  
  /**
   * @see StandardQueryParser#StandardQueryParser(Analyzer)
   */
  public PrecedenceQueryParser(Analyzer analyer) {
    super(analyer);
    
    setQueryNodeProcessor(new PrecedenceQueryNodeProcessorPipeline(getQueryConfigHandler()));
    
  }

}