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 * 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 *******************************************************************************/
28 package org.sat4j.tools.xplain;
29
30 import org.sat4j.specs.IConstr;
31
32 /**
33 * @author daniel
34 * @since 2.1
35 */
36 public class Pair implements Comparable<Pair> {
37 public final Integer key;
38 public final IConstr constr;
39
40 public Pair(Integer key, IConstr constr) {
41 this.key = key;
42 this.constr = constr;
43 }
44
45 public int compareTo(Pair arg0) {
46 double activityThis = constr.getActivity();
47 double activityArg = arg0.constr.getActivity();
48 if (activityThis == activityArg) {
49 return arg0.key - key;
50 }
51 return Double.compare(activityArg, activityThis);
52 }
53
54 @Override
55 public String toString() {
56 return key.toString() + ":" + constr.getActivity();
57 }
58 }