View Javadoc
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  }