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 package org.sat4j.tools;
31
32 import java.io.File;
33 import java.io.FileNotFoundException;
34 import java.io.FileOutputStream;
35 import java.io.PrintStream;
36
37 import org.sat4j.core.LiteralsUtils;
38 import org.sat4j.specs.IConstr;
39 import org.sat4j.specs.ISolverService;
40 import org.sat4j.specs.Lbool;
41
42 /**
43 * Output an unsat proof using the reverse unit propagation (RUP) format.
44 *
45 * @author daniel
46 *
47 * @param <S>
48 * a solver service
49 * @since 2.3.4
50 */
51 public class RupSearchListener<S extends ISolverService> extends
52 SearchListenerAdapter<S> {
53
54 /**
55 *
56 */
57 private static final long serialVersionUID = 1L;
58
59 private PrintStream out;
60 private final File file;
61
62 public RupSearchListener(String filename) {
63 file = new File(filename);
64 }
65
66 @Override
67 public void init(S solverService) {
68 try {
69 out = new PrintStream(new FileOutputStream(file));
70 } catch (FileNotFoundException e) {
71 out = System.out;
72 }
73 }
74
75 @Override
76 public void end(Lbool result) {
77 if (result == Lbool.FALSE) {
78 out.println("0");
79 out.close();
80 } else {
81 out.close();
82 file.delete();
83 }
84 }
85
86 @Override
87 public void learn(IConstr c) {
88 for (int i = 0; i < c.size(); i++) {
89 out.print(LiteralsUtils.toDimacs(c.get(i)));
90 out.print(" ");
91 }
92 out.println("0");
93 }
94
95 @Override
96 public void learnUnit(int p) {
97 out.print(p);
98 out.println(" 0");
99 }
100
101 }