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 * https://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 21 package org.apache.directory.api.ldap.trigger; 22 23 24 import antlr.TokenStream; 25 26 27 /** 28 * A reusable lexer class extended from antlr generated parser for an LDAP 29 * Trigger Specification as defined at <a 30 * href="http://docs.safehaus.org/display/APACHEDS/Grammar+for+Triggers"> 31 * The ABNF grammar for LDAP Triggers</a>. 32 * 33 * <p>This class enables the reuse of the antlr lexer without having to recreate 34 * the it every time as stated in <a 35 * href="http://www.antlr.org:8080/pipermail/antlr-interest/2003-April/003631.html"> 36 * an ANTLR Interest Group mail</a> . 37 * 38 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 39 */ 40 class ReusableAntlrTriggerSpecificationParser extends AntlrTriggerSpecificationParser 41 { 42 /** 43 * Creates a ReusableAntlrTriggerSpecificationParser instance. 44 * 45 * @param lexer The token stream to use 46 */ 47 ReusableAntlrTriggerSpecificationParser( TokenStream lexer ) 48 { 49 super( lexer ); 50 } 51 52 53 /** 54 * Resets the state of an antlr parser. 55 */ 56 public void resetState() 57 { 58 // no set method for this protected field. 59 this.traceDepth = 0; 60 61 this.getInputState().reset(); 62 } 63 }