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1
17
18 package org.sablecc.sablecc.structure;
19
20 import java.util.Collections  ;
21 import java.util.SortedSet ;
22 import java.util.TreeSet ;
23
24 import org.sablecc.sablecc.exception.InternalException;
25
26 public class Group
27 implements Comparable <Group> {
28
29 private final String name;
30
31 private SortedSet <Token> tokens = new TreeSet <Token>();
32
33 private boolean isStable = false;
34
35 Group(
36 String name) {
37
38 this.name = name;
39 }
40
41 public boolean hasName() {
42
43 return this.name != null;
44 }
45
46 public String getName() {
47
48 if (this.name == null) {
49 throw new InternalException("this group does not have a name");
50 }
51
52 return this.name;
53 }
54
55 public SortedSet <Token> getTokens() {
56
57 if (!this.isStable) {
58 throw new InternalException("this group is not stable yet");
59 }
60
61 return this.tokens;
62 }
63
64 boolean isStable() {
65
66 return this.isStable;
67 }
68
69 @Override
70 public boolean equals(
71 Object obj) {
72
73 if (this == obj) {
74 return true;
75 }
76
77 if (obj == null) {
78 return false;
79 }
80
81 if (getClass() != obj.getClass()) {
82 return false;
83 }
84
85 Group group = (Group) obj;
86
87 if (this.name == null) {
88 return this.name == group.name;
89 }
90
91 return this.name.equals(group.name);
92 }
93
94 @Override
95 public int hashCode() {
96
97 if (this.name == null) {
98 return 0;
99 }
100
101 return this.name.hashCode();
102 }
103
104 public int compareTo(
105 Group group) {
106
107 if (this.name == null) {
108 if (group.name == null) {
109 return 0;
110 }
111
112 return -1;
113 }
114 else if (group == null) {
115 return 1;
116 }
117
118 return this.name.compareTo(group.name);
119 }
120
121 void stabilize() {
122
123 if (this.isStable) {
124 throw new InternalException("this group is already stable");
125 }
126
127 this.tokens = Collections.unmodifiableSortedSet(this.tokens);
128 this.isStable = true;
129 }
130
131 void addToken(
132 Token token) {
133
134 if (this.isStable) {
135 throw new InternalException("a stable group may not be modified");
136 }
137
138 if (this.tokens.contains(token)) {
139 throw new InternalException(
140 "the token is already included in this group");
141 }
142
143 if (token.getGroup() != this) {
144 throw new InternalException(
145 "the token does not belong to this group");
146 }
147
148 this.tokens.add(token);
149 }
150 }
151 |
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