http://lucene.apache.org/lucene-parent/lucene-queryparser: Lucene QueryParsers module (The Apache Software Foundation) 
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 * 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,
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package org.apache.lucene.queryparser.flexible.core.parser;

import org.apache.lucene.queryparser.flexible.core.QueryNodeParseException;
import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;


A parser needs to implement SyntaxParser interface 
/**
 * A parser needs to implement {@link SyntaxParser} interface
 */
public interface SyntaxParser {
  
Params:
  • query – 
         - query data to be parsed
  • field – 
         - default field name
Returns:QueryNode tree
/**
   * @param query
   *          - query data to be parsed
   * @param field
   *          - default field name
   * @return QueryNode tree
   */
  public QueryNode parse(CharSequence query, CharSequence field)
      throws QueryNodeParseException;
}