1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
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 * Based on the original MiniSat specification from:
20 *
21 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22 * Sixth International Conference on Theory and Applications of Satisfiability
23 * Testing, LNCS 2919, pp 502-518, 2003.
24 *
25 * See www.minisat.se for the original solver in C++.
26 *
27 * Contributors:
28 * CRIL - initial API and implementation
29 *******************************************************************************/
30
31 package org.sat4j.pb.tools;
32
33 import java.math.BigInteger;
34
35 public class WeightedObject<T> implements Comparable<WeightedObject<T>> {
36
37 public final T thing;
38 private BigInteger weight;
39
40 private WeightedObject(T thing, BigInteger weight) {
41 this.thing = thing;
42 this.weight = weight;
43 }
44
45 public BigInteger getWeight() {
46 return this.weight;
47 }
48
49 public void increaseWeight(BigInteger delta) {
50 this.weight = this.weight.add(delta);
51 }
52
53 public int compareTo(WeightedObject<T> arg0) {
54 return this.weight.compareTo(arg0.getWeight());
55 }
56
57 public static <E> WeightedObject<E> newWO(E e, int w) {
58 return new WeightedObject<E>(e, BigInteger.valueOf(w));
59 }
60
61 public static <E> WeightedObject<E> newWO(E e, long w) {
62 return new WeightedObject<E>(e, BigInteger.valueOf(w));
63 }
64
65 public static <E> WeightedObject<E> newWO(E e, BigInteger w) {
66 return new WeightedObject<E>(e, w);
67 }
68
69 @Override
70 public int hashCode() {
71 final int prime = 31;
72 int result = 1;
73 result = prime * result
74 + (this.thing == null ? 0 : this.thing.hashCode());
75 result = prime * result
76 + (this.weight == null ? 0 : this.weight.hashCode());
77 return result;
78 }
79
80 @Override
81 public boolean equals(Object obj) {
82 if (this == obj) {
83 return true;
84 }
85 if (obj == null) {
86 return false;
87 }
88 if (getClass() != obj.getClass()) {
89 return false;
90 }
91 WeightedObject<?> other = (WeightedObject<?>) obj;
92 if (this.thing == null) {
93 if (other.thing != null) {
94 return false;
95 }
96 } else if (!this.thing.equals(other.thing)) {
97 return false;
98 }
99 if (this.weight == null) {
100 if (other.weight != null) {
101 return false;
102 }
103 } else if (!this.weight.equals(other.weight)) {
104 return false;
105 }
106 return true;
107 }
108 }