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 21 package org.apache.directory.api.ldap.model.subtree; 22 23 24 import org.apache.directory.api.ldap.model.subtree.AntlrSubtreeSpecificationParser; 25 26 import antlr.TokenStream; 27 28 29 /** 30 * A reusable parser class extended from antlr generated parser for an LDAP 31 * subtree specification as defined by <a 32 * href="http://www.faqs.org/rfcs/rfc3672.html"> RFC 3672</a>. This class 33 * enables the reuse of the antlr parser without having to recreate the it every 34 * time as stated in <a 35 * href="http://www.antlr.org:8080/pipermail/antlr-interest/2003-April/003631.html"> 36 * a Antlr Interest Group mail</a> . 37 * 38 * @see <a href="http://www.faqs.org/rfcs/rfc3672.html">RFC 3672</a> 39 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 40 */ 41 class ReusableAntlrSubtreeSpecificationParser extends AntlrSubtreeSpecificationParser 42 { 43 /** 44 * Creates a ReusableAntlrSubtreeSpecificationParser instance. 45 */ 46 public ReusableAntlrSubtreeSpecificationParser( 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 }