View Javadoc

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;
31  
32  import static org.junit.Assert.assertEquals;
33  
34  import org.junit.Test;
35  import org.sat4j.core.VecInt;
36  import org.sat4j.minisat.SolverFactory;
37  import org.sat4j.specs.ContradictionException;
38  import org.sat4j.specs.ISolver;
39  import org.sat4j.specs.TimeoutException;
40  
41  public class BugSAT43 {
42  
43      @Test
44      public void testNoDeclaredVariables() throws ContradictionException,
45              TimeoutException {
46          ISolver solver = SolverFactory.newDefault();
47          assertEquals(0, solver.nVars());
48          assertEquals(0, solver.realNumberOfVariables());
49          for (int i = 0; i < 10; i++) {
50              solver.nextFreeVarId(true);
51          }
52          assertEquals(10, solver.nVars());
53          assertEquals(10, solver.realNumberOfVariables());
54          solver.addClause(new VecInt(new int[] { 1, 2, 3 }));
55          int[] model1 = solver.findModel();
56          assertEquals(3, model1.length);
57          int[] model2 = solver.modelWithInternalVariables();
58          assertEquals(3, model2.length);
59      }
60  
61      @Test
62      public void testDeclaredVariables() throws ContradictionException,
63              TimeoutException {
64          ISolver solver = SolverFactory.newDefault();
65          solver.newVar(10);
66          assertEquals(10, solver.nVars());
67          assertEquals(10, solver.realNumberOfVariables());
68          solver.addClause(new VecInt(new int[] { 1, 2, 3 }));
69          int[] model1 = solver.findModel();
70          assertEquals(3, model1.length);
71          int[] model2 = solver.modelWithInternalVariables();
72          assertEquals(3, model2.length);
73          for (int i = 0; i < 10; i++) {
74              solver.nextFreeVarId(true);
75          }
76          assertEquals(10, solver.nVars());
77          assertEquals(20, solver.realNumberOfVariables());
78          model1 = solver.findModel();
79          assertEquals(3, model1.length);
80          System.out.println(new VecInt(model1));
81          model2 = solver.modelWithInternalVariables();
82          assertEquals(3, model2.length);
83          int[] clause = { 14, 16, 19 };
84          solver.addClause(new VecInt(clause));
85          model1 = solver.findModel();
86          assertEquals(3, model1.length);
87          System.out.println(new VecInt(model1));
88          model2 = solver.modelWithInternalVariables();
89          assertEquals(6, model2.length);
90      }
91  
92      @Test
93      public void implicitDeclarationOfVariables() throws ContradictionException,
94              TimeoutException {
95          ISolver solver = SolverFactory.newDefault();
96          assertEquals(0, solver.nVars());
97          assertEquals(0, solver.realNumberOfVariables());
98          solver.addClause(new VecInt(new int[] { 1, 2, 3 }));
99          assertEquals(3, solver.nVars());
100         assertEquals(3, solver.realNumberOfVariables());
101         for (int i = 0; i < 10; i++) {
102             solver.nextFreeVarId(true);
103         }
104         assertEquals(13, solver.nVars());
105         assertEquals(13, solver.realNumberOfVariables());
106         int[] model1 = solver.findModel();
107         assertEquals(3, model1.length);
108         int[] model2 = solver.modelWithInternalVariables();
109         assertEquals(3, model2.length);
110     }
111 }