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Java > Open Source Codes > org > antlr > works > visualization > fa > FATransition


1 /*
2
3 [The "BSD licence"]
4 Copyright (c) 2005 Jean Bovet
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions
9 are met:
10
11 1. Redistributions of source code must retain the above copyright
12 notice, this list of conditions and the following disclaimer.
13 2. Redistributions in binary form must reproduce the above copyright
14 notice, this list of conditions and the following disclaimer in the
15 documentation and/or other materials provided with the distribution.
16 3. The name of the author may not be used to endorse or promote products
17 derived from this software without specific prior written permission.
18
19 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 */
31
32
33 package org.antlr.works.visualization.fa;
34
35 import java.util.List JavaDoc;
36
37 public class FATransition {
38
39     public FAState source;
40     public String JavaDoc label;
41     public FAState target;
42
43     /** True if this is a "loop" transition (reverse direction) */
44     public boolean loop = false;
45
46     /** True if this transition represent an external reference rule */
47     public boolean externalRuleRef = false;
48
49     /** Set of all skipped states along this transition */
50     public List JavaDoc<Integer JavaDoc> skippedStates;
51
52     public FATransition(String JavaDoc label, FAState targetState) {
53         this.label = label;
54         this.target = targetState;
55     }
56
57     public FATransition(FAState targetState) {
58         this(targetState, null);
59     }
60
61     public FATransition(FAState targetState, List JavaDoc<Integer JavaDoc> skippedStates) {
62         this.label = null; // epsilon transition
63 this.target = targetState;
64         this.skippedStates = skippedStates;
65     }
66
67     public void setSourceState(FAState source) {
68         this.source = source;
69     }
70
71     public void setLoop(boolean loop) {
72         this.loop = loop;
73     }
74
75     public void setExternalRuleRef(boolean flag) {
76         this.externalRuleRef = flag;
77     }
78
79     public boolean isEpsilon() {
80         return label == null;
81     }
82
83     public boolean containsStateNumber(int n) {
84         for (Integer JavaDoc state : skippedStates) {
85             if (state == n)
86                 return true;
87         }
88         return false;
89     }
90 }
91
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