1 | /* |
2 | * Copyright (c) 2005 The PseudoQ Project. |
3 | * |
4 | * This file is part of PseudoQ. |
5 | * |
6 | * PseudoQ is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU Lesser General Public License as published by |
8 | * the Free Software Foundation; either version 2.1 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * PseudoQ is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public License |
17 | * along with PseudoQ; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
19 | */ |
20 | |
21 | package net.sourceforge.pseudoq.generation; |
22 | |
23 | import java.util.LinkedList; |
24 | import java.util.List; |
25 | |
26 | import net.sourceforge.pseudoq.model.Coordinate; |
27 | import net.sourceforge.pseudoq.model.Region; |
28 | |
29 | /** |
30 | * Tracks the possible values that can be placed in a given cell. |
31 | * @author <a href="http://sourceforge.net/users/stevensa">Andrew Stevens</a> |
32 | */ |
33 | public class CellPossibilities { |
34 | private List<Integer> possibilities; |
35 | private Coordinate coord; |
36 | private Region region; |
37 | private int digits; |
38 | |
39 | /** |
40 | * Creates a new instance of CellPossibilities |
41 | * @param coord Coordinate to track the possible values of. |
42 | * @param digits The number of possible values. |
43 | * @param region Region containing all the cells that affect this one. |
44 | */ |
45 | public CellPossibilities(Coordinate coord, int digits, Region region) { |
46 | if (coord == null) { |
47 | throw new IllegalArgumentException("Can't create counter for null coordinates"); |
48 | } |
49 | if (region == null) { |
50 | throw new IllegalArgumentException("Can't create counter for null region"); |
51 | } |
52 | if (digits <= 0) { |
53 | throw new IllegalArgumentException("Can't create counter with no digits"); |
54 | } |
55 | |
56 | this.coord = coord; |
57 | this.region = region; |
58 | this.digits = digits; |
59 | reset(); |
60 | } |
61 | |
62 | public void place(Coordinate coord, int value) { |
63 | assert (this.coord != null); |
64 | assert (region != null); |
65 | assert (possibilities != null); |
66 | |
67 | if (this.coord.equals(coord)) { |
68 | possibilities.clear(); |
69 | possibilities.add(Integer.valueOf(value)); |
70 | } else if (region.contains(coord)) { |
71 | possibilities.remove(Integer.valueOf(value)); |
72 | } |
73 | } |
74 | |
75 | public int getCount() { |
76 | assert (possibilities != null); |
77 | |
78 | return possibilities.size(); |
79 | } |
80 | |
81 | public void reset() { |
82 | assert (digits > 0); |
83 | |
84 | possibilities = new LinkedList<Integer>(); |
85 | for (int i = 1; i <= digits; i++) { |
86 | possibilities.add(Integer.valueOf(i)); |
87 | } |
88 | } |
89 | |
90 | /** |
91 | * Getter for property possibilities. |
92 | * @return Value of property possibilities. |
93 | */ |
94 | public List<Integer> getPossibilities() { |
95 | return this.possibilities; |
96 | } |
97 | |
98 | } |