1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
3 *
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
8 *
9 * Alternatively, the contents of this file may be used under the terms of
10 * either the GNU Lesser General Public License Version 2.1 or later (the
11 * "LGPL"), in which case the provisions of the LGPL are applicable instead
12 * of those above. If you wish to allow use of your version of this file only
13 * under the terms of the LGPL, and not to allow others to use your version of
14 * this file under the terms of the EPL, indicate your decision by deleting
15 * the provisions above and replace them with the notice and other provisions
16 * required by the LGPL. If you do not delete the provisions above, a recipient
17 * may use your version of this file under the terms of the EPL or the LGPL.
18 *******************************************************************************/
19 package org.sat4j.csp;
20
21 import java.util.NoSuchElementException;
22
23 import org.sat4j.specs.IteratorInt;
24
25 /**
26 * Represents a domain with a single value.
27 *
28 * @author leberre
29 */
30 public class SingletonDomain implements Domain {
31
32 private final int value;
33
34 public SingletonDomain(int v) {
35 value = v;
36 }
37
38 public int get(int i) {
39 if (i != 0) {
40 throw new IllegalArgumentException();
41 }
42 return value;
43 }
44
45 public int size() {
46 return 1;
47 }
48
49 public IteratorInt iterator() {
50 return new IteratorInt() {
51 private int i = 0;
52
53 public boolean hasNext() {
54 return i < 1;
55 }
56
57 public int next() {
58 if (i == 1)
59 throw new NoSuchElementException();
60 return value;
61 }
62 };
63 }
64
65 public int pos(int theValue) {
66 if (theValue != this.value) {
67 throw new IllegalArgumentException();
68 }
69 return 0;
70 }
71
72 }