001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *  
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *  
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License. 
018 *  
019 */
020package org.apache.directory.api.ldap.model.schema.parsers;
021
022
023import org.apache.directory.api.ldap.model.schema.syntaxes.AntlrSchemaParser;
024
025import antlr.TokenStream;
026
027
028/**
029 * A reusable parser class extended from antlr generated parser for an LDAP
030 * schema as defined in RFC 4512. This class
031 * enables the reuse of the antlr parser without having to recreate the it every
032 * time as stated in <a
033 * href="http://www.antlr.org:8080/pipermail/antlr-interest/2003-April/003631.html">
034 * a Antlr Interest Group mail</a> .
035 * 
036 * @see <a href="http://www.faqs.org/rfcs/rfc3672.html">RFC 3672</a>
037 */
038public class ReusableAntlrSchemaParser extends AntlrSchemaParser
039{
040
041    /**
042     * Creates a ReusableAntlrSchemaParser instance.
043     *
044     * @param lexer the lexer
045     */
046    public ReusableAntlrSchemaParser( TokenStream lexer )
047    {
048        super( lexer );
049    }
050
051
052    /**
053     * Resets the state of an antlr parser.
054     */
055    public void resetState()
056    {
057        // no set method for this protected field.
058        this.traceDepth = 0;
059
060        this.getInputState().reset();
061    }
062}