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Java > Open Source Codes > com > hp > hpl > jena > rdql > parser > Token


1 /* Generated By:JavaCC: Do not edit this line. Token.java Version 2.1 */
2 /*
3  * (c) Copyright 2001, 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
4  * All rights reserved.
5  */
6
7 package com.hp.hpl.jena.rdql.parser;
8
9 /**
10  * Describes the input token stream.
11  */
12
13 public class Token {
14
15   /**
16    * An integer that describes the kind of this token. This numbering
17    * system is determined by JavaCCParser, and a table of these numbers is
18    * stored in the file ...Constants.java.
19    */
20   public int kind;
21
22   /**
23    * beginLine and beginColumn describe the position of the first character
24    * of this token; endLine and endColumn describe the position of the
25    * last character of this token.
26    */
27   public int beginLine, beginColumn, endLine, endColumn;
28
29   /**
30    * The string image of the token.
31    */
32   public String JavaDoc image;
33
34   /**
35    * A reference to the next regular (non-special) token from the input
36    * stream. If this is the last token from the input stream, or if the
37    * token manager has not read tokens beyond this one, this field is
38    * set to null. This is true only if this token is also a regular
39    * token. Otherwise, see below for a description of the contents of
40    * this field.
41    */
42   public Token next;
43
44   /**
45    * This field is used to access special tokens that occur prior to this
46    * token, but after the immediately preceding regular (non-special) token.
47    * If there are no such special tokens, this field is set to null.
48    * When there are more than one such special token, this field refers
49    * to the last of these special tokens, which in turn refers to the next
50    * previous special token through its specialToken field, and so on
51    * until the first special token (whose specialToken field is null).
52    * The next fields of special tokens refer to other special tokens that
53    * immediately follow it (without an intervening regular token). If there
54    * is no such token, this field is null.
55    */
56   public Token specialToken;
57
58   /**
59    * Returns the image.
60    */
61   public final String JavaDoc toString()
62   {
63      return image;
64   }
65
66   /**
67    * Returns a new Token object, by default. However, if you want, you
68    * can create and return subclass objects based on the value of ofKind.
69    * Simply add the cases to the switch for all those special cases.
70    * For example, if you have a subclass of Token called IDToken that
71    * you want to create if ofKind is ID, simlpy add something like :
72    *
73    * case MyParserConstants.ID : return new IDToken();
74    *
75    * to the following switch statement. Then you can cast matchedToken
76    * variable to the appropriate type and use it in your lexical actions.
77    */
78   public static final Token newToken(int ofKind)
79   {
80      switch(ofKind)
81      {
82        default : return new Token();
83      }
84   }
85
86 }
87
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