1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/* -*- java -*- */
/**
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
{
/**
* Node for the list
*/
public class Node
{
/**
* Constructor
*
* @param value The value to store in the list
*/
public Node(T value)
{
this.value = value;
}
/**
* The value stored in the list by this node
*/
public T value;
/**
* The next node in the list
*/
public Node next = null;
£>if (( with_prev )); then
/**
* The previous node in the list
*/
public Node previous = null;
£>fi
}
/**
* The sentinel node in the list
*/
public Node edge;
/**
* Initialiser
*/
{
this.edge.next = this.edge;
£>if (( with_prev )); then
this.edge.previous = this.edge;
£>fi
}
/**
* Insert a value in the beginning of the list
*
* @param value The value to insert
* @return The node that has been created and inserted
*/
public Node insertBeginning(T value)
{
return insertAfter(value, this.edge);
}
/**
* Remove the node at the beginning of the list
*
* @return The node that has been removed
*/
public Node removeBeginning()
{
return removeAfter(this.edge);
}
/**
* Insert a value after a specified, reference, node
*
* @param value The value to insert
* @param predecessor The reference node
* @return The node that has been created and inserted
*/
public Node insertAfter(T value, Node predecessor)
{
Node node = new Node(value);
node.next = predecessor.next;
predecessor.next = node;
£>if (( with_prev )); then
node.previous = predecessor;
node.next.previous = node;
£>fi
return node;
}
/**
* Remove the node after a specified, reference, node
*
* @param predecessor The reference node
* @return The node that has been removed
*/
public Node removeAfter(Node predecessor)
{
Node node = predecessor.next;
predecessor.next = node.next;
£>if (( with_prev )); then
predecessor.next.previous = predecessor;
£>fi
return node;
}
£>if (( with_prev )); then
/**
* Insert a value before a specified, reference, node
*
* @param value The value to insert
* @param successor The reference node
* @return The node that has been created and inserted
*/
public Node insertBefore(T value, Node successor)
{
Node node = new Node(value);
node.previous = successor.previous;
successor.previous = node;
node.next = successor;
node.previous.next = node;
return node;
}
/**
* Remove the node before a specified, reference, node
*
* @param successor The reference node
* @return The node that has been removed
*/
public Node removeBefore(Node successor)
{
Node node = successor.previous;
successor.previous = node.previous;
successor.previous.next = successor;
return node;
}
/**
* Remove the node from the list
*
* @param node The node to remove
*/
public void remove(Node node)
{
node.previous.next = node.next;
node.next.previous = node.previous;
}
/**
* Insert a value in the end of the list
*
* @param value The value to insert
* @return The node that has been created and inserted
*/
public Node insertEnd(T value)
{
return insertBefore(value, this.edge);
}
/**
* Remove the node at the end of the list
*
* @return The node that has been removed
*/
public Node removeEnd()
{
return removeBefore(this.edge);
}
£>fi
}
|
