01: package org.ofbiz.rules.parse;
02:
03: import java.util.*;
04:
05: /**
06: * <p><b>Title:</b> Parser Visitor
07: * <p><b>Description:</b> None
08: * <p>Copyright (c) 1999 Steven J. Metsker.
09: * <p>Copyright (c) 2001 The Open For Business Project - www.ofbiz.org
10: *
11: * <p>Permission is hereby granted, free of charge, to any person obtaining a
12: * copy of this software and associated documentation files (the "Software"),
13: * to deal in the Software without restriction, including without limitation
14: * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15: * and/or sell copies of the Software, and to permit persons to whom the
16: * Software is furnished to do so, subject to the following conditions:
17: *
18: * <p>The above copyright notice and this permission notice shall be included
19: * in all copies or substantial portions of the Software.
20: *
21: * <p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22: * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
24: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
25: * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
26: * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
27: * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28: *
29: * <br>
30: * <p>This class provides a "visitor" hierarchy in support of
31: * the Visitor pattern -- see the book, "Design Patterns" for
32: * an explanation of this pattern.
33: *
34: * @author Steven J. Metsker
35: * @version 1.0
36: */
37: public abstract class ParserVisitor {
38:
39: /**
40: * Visit an alternation.
41: *
42: * @param a the parser to visit
43: * @param visited a collection of previously visited parsers
44: */
45: public abstract void visitAlternation(Alternation a, List visited);
46:
47: /**
48: * Visit an empty parser.
49: *
50: * @param e the parser to visit
51: * @param visited a collection of previously visited parsers
52: */
53: public abstract void visitEmpty(Empty e, List visited);
54:
55: /**
56: * Visit a repetition.
57: *
58: * @param r the parser to visit
59: * @param visited a collection of previously visited parsers
60: */
61: public abstract void visitRepetition(Repetition r, List visited);
62:
63: /**
64: * Visit a sequence.
65: *
66: * @param s the parser to visit
67: * @param visited a collection of previously visited parsers
68: */
69: public abstract void visitSequence(Sequence s, List visited);
70:
71: /**
72: * Visit a terminal.
73: *
74: * @param t the parser to visit
75: * @param visited a collection of previously visited parsers
76: */
77: public abstract void visitTerminal(Terminal t, List visited);
78: }
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