Source Code Cross Referenced for Token.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » tools » ij » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.tools.ij 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* Generated By:JavaCC: Do not edit this line. Token.java Version 3.0 */
02:        package org.apache.derby.impl.tools.ij;
03:
04:        /**
05:         * Describes the input token stream.
06:         */
07:
08:        public class Token {
09:
10:            /**
11:             * An integer that describes the kind of this token.  This numbering
12:             * system is determined by JavaCCParser, and a table of these numbers is
13:             * stored in the file ...Constants.java.
14:             */
15:            public int kind;
16:
17:            /**
18:             * beginLine and beginColumn describe the position of the first character
19:             * of this token; endLine and endColumn describe the position of the
20:             * last character of this token.
21:             */
22:            public int beginLine, beginColumn, endLine, endColumn;
23:
24:            /**
25:             * The string image of the token.
26:             */
27:            public String image;
28:
29:            /**
30:             * A reference to the next regular (non-special) token from the input
31:             * stream.  If this is the last token from the input stream, or if the
32:             * token manager has not read tokens beyond this one, this field is
33:             * set to null.  This is true only if this token is also a regular
34:             * token.  Otherwise, see below for a description of the contents of
35:             * this field.
36:             */
37:            public Token next;
38:
39:            /**
40:             * This field is used to access special tokens that occur prior to this
41:             * token, but after the immediately preceding regular (non-special) token.
42:             * If there are no such special tokens, this field is set to null.
43:             * When there are more than one such special token, this field refers
44:             * to the last of these special tokens, which in turn refers to the next
45:             * previous special token through its specialToken field, and so on
46:             * until the first special token (whose specialToken field is null).
47:             * The next fields of special tokens refer to other special tokens that
48:             * immediately follow it (without an intervening regular token).  If there
49:             * is no such token, this field is null.
50:             */
51:            public Token specialToken;
52:
53:            /**
54:             * Returns the image.
55:             */
56:            public String toString() {
57:                return image;
58:            }
59:
60:            /**
61:             * Returns a new Token object, by default. However, if you want, you
62:             * can create and return subclass objects based on the value of ofKind.
63:             * Simply add the cases to the switch for all those special cases.
64:             * For example, if you have a subclass of Token called IDToken that
65:             * you want to create if ofKind is ID, simlpy add something like :
66:             *
67:             *    case MyParserConstants.ID : return new IDToken();
68:             *
69:             * to the following switch statement. Then you can cast matchedToken
70:             * variable to the appropriate type and use it in your lexical actions.
71:             */
72:            public static final Token newToken(int ofKind) {
73:                switch (ofKind) {
74:                default:
75:                    return new Token();
76:                }
77:            }
78:
79:        }
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