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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  }