/*
* 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.api.ldap.model.schema.parsers;
import java.io.Reader;
import org.apache.directory.api.ldap.model.schema.syntaxes.AntlrSchemaLexer;
import antlr.CharBuffer;
import antlr.LexerSharedInputState;
/**
* A reusable lexer class extended from antlr generated lexer for an LDAP
* schema as defined in RFC 4512. 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">
* a Antlr Interest Group mail</a> .
*
* @see <a href="http://www.faqs.org/rfcs/rfc3672.html">RFC 3672</a>
*/
public class ReusableAntlrSchemaLexer extends AntlrSchemaLexer
{
private boolean savedCaseSensitive;
private boolean savedCaseSensitiveLiterals;
/**
* Creates a ReusableAntlrSchemaLexer instance.
*
* @param in
* the input to the lexer
*/
public ReusableAntlrSchemaLexer( 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;
}
}