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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.pb;
31  
32  import static org.junit.Assert.assertEquals;
33  
34  import java.math.BigInteger;
35  
36  import org.junit.Test;
37  import org.sat4j.core.Vec;
38  import org.sat4j.core.VecInt;
39  import org.sat4j.specs.ContradictionException;
40  import org.sat4j.specs.IVec;
41  import org.sat4j.specs.IVecInt;
42  
43  public class PbmOPBStringSolver {
44  
45      private static final String STRING1 = "* #variable= 3 #constraint= 1\n+1 x1 +1 x2 +1 x3 >= 1 ;\n";
46      private static final String STRING2 = "* #variable= 3 #constraint= 1\n"
47              + "min: +10 x2 +32 x3 ;\n+1 x1 +1 x2 +1 x3 >= 1 ;\n";
48  
49      @Test
50      public void testNoMin() throws ContradictionException {
51          IPBSolver solver = new OPBStringSolver();
52          solver.newVar(3);
53          IVecInt clause = new VecInt();
54          clause.push(1).push(2).push(3);
55          solver.addClause(clause);
56          assertEquals(STRING1, solver.toString());
57      }
58  
59      @Test
60      public void testWithMin() throws ContradictionException {
61          IPBSolver solver = new OPBStringSolver();
62          solver.newVar(3);
63          IVecInt clause = new VecInt();
64          clause.push(1).push(2).push(3);
65          solver.addClause(clause);
66          IVecInt vars = new VecInt();
67          vars.push(2).push(3);
68          IVec<BigInteger> coeffs = new Vec<BigInteger>();
69          coeffs.push(BigInteger.TEN).push(BigInteger.valueOf(32));
70          ObjectiveFunction obj = new ObjectiveFunction(vars, coeffs);
71          solver.setObjectiveFunction(obj);
72          assertEquals(STRING2, solver.toString());
73  
74      }
75  }