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}