1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.directory.api.ldap.model.schema.parsers; 21 22 23 import org.apache.directory.api.ldap.model.schema.syntaxes.AntlrSchemaParser; 24 25 import antlr.TokenStream; 26 27 28 /** 29 * A reusable parser class extended from antlr generated parser for an LDAP 30 * schema as defined in RFC 4512. This class 31 * enables the reuse of the antlr parser without having to recreate the it every 32 * time as stated in <a 33 * href="http://www.antlr.org:8080/pipermail/antlr-interest/2003-April/003631.html"> 34 * a Antlr Interest Group mail</a> . 35 * 36 * @see <a href="http://www.faqs.org/rfcs/rfc3672.html">RFC 3672</a> 37 */ 38 public class ReusableAntlrSchemaParser extends AntlrSchemaParser 39 { 40 41 /** 42 * Creates a ReusableAntlrSchemaParser instance. 43 * 44 * @param lexer the lexer 45 */ 46 public ReusableAntlrSchemaParser( TokenStream lexer ) 47 { 48 super( lexer ); 49 } 50 51 52 /** 53 * Resets the state of an antlr parser. 54 */ 55 public void resetState() 56 { 57 // no set method for this protected field. 58 this.traceDepth = 0; 59 60 this.getInputState().reset(); 61 } 62 }