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 */ 020 package org.apache.directory.shared.ldap.schema.parsers; 021 022 import org.apache.directory.shared.ldap.schema.syntax.AntlrSchemaParser; 023 024 import antlr.TokenStream; 025 026 /** 027 * A reusable parser class extended from antlr generated parser for an LDAP 028 * schema as defined in RFC 4512. This class 029 * enables the reuse of the antlr parser without having to recreate the it every 030 * time as stated in <a 031 * href="http://www.antlr.org:8080/pipermail/antlr-interest/2003-April/003631.html"> 032 * a Antlr Interest Group mail</a> . 033 * 034 * @see <a href="http://www.faqs.org/rfcs/rfc3672.html">RFC 3672</a> 035 * @version $Rev$, $Date$ 036 */ 037 public class ReusableAntlrSchemaParser extends AntlrSchemaParser 038 { 039 /** 040 * Creates a ReusableAntlrSchemaParser instance. 041 */ 042 public ReusableAntlrSchemaParser( TokenStream lexer ) 043 { 044 super( lexer ); 045 } 046 047 048 /** 049 * Resets the state of an antlr parser. 050 */ 051 public void resetState() 052 { 053 // no set method for this protected field. 054 this.traceDepth = 0; 055 056 this.getInputState().reset(); 057 } 058 }