| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| |
| package org.apache.directory.shared.ldap.trigger; |
| |
| |
| import java.io.Reader; |
| |
| import antlr.CharBuffer; |
| import antlr.LexerSharedInputState; |
| |
| |
| /** |
| * A reusable lexer class extended from antlr generated lexer for an LDAP |
| * Trigger Specification as defined at <a |
| * href="http://docs.safehaus.org/display/APACHEDS/Grammar+for+Triggers"> |
| * The ABNF grammar for LDAP Triggers</a>. |
| * |
| * <p>This class enables the reuse of the antlr lexer without having to recreate |
| * the it every time as stated in <a |
| * href="http://www.antlr.org:8080/pipermail/antlr-interest/2003-April/003631.html"> |
| * an ANTLR Interest Group mail</a> . |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| class ReusableAntlrTriggerSpecificationLexer extends AntlrTriggerSpecificationLexer |
| { |
| private boolean savedCaseSensitive; |
| |
| private boolean savedCaseSensitiveLiterals; |
| |
| |
| /** |
| * Creates a ReusableAntlrTriggerSpecificationLexer instance. |
| * |
| * @param in |
| * the input to the lexer |
| */ |
| public ReusableAntlrTriggerSpecificationLexer( Reader in ) |
| { |
| super( in ); |
| savedCaseSensitive = getCaseSensitive(); |
| savedCaseSensitiveLiterals = getCaseSensitiveLiterals(); |
| } |
| |
| |
| /** |
| * Resets the state of an antlr lexer and initializes it with new input. |
| * |
| * @param in |
| * the input to the lexer |
| */ |
| public void prepareNextInput( Reader in ) |
| { |
| CharBuffer buf = new CharBuffer( in ); |
| LexerSharedInputState state = new LexerSharedInputState( buf ); |
| this.setInputState( state ); |
| |
| this.setCaseSensitive( savedCaseSensitive ); |
| |
| // no set method for this protected field |
| this.caseSensitiveLiterals = savedCaseSensitiveLiterals; |
| } |
| } |