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30 package org.sat4j.pb.tools;
31
32 import java.math.BigInteger;
33
34 import org.sat4j.ILauncherMode;
35 import org.sat4j.pb.IPBSolverService;
36 import org.sat4j.pb.ObjectiveFunction;
37 import org.sat4j.specs.RandomAccessModel;
38 import org.sat4j.specs.Lbool;
39 import org.sat4j.tools.SearchListenerAdapter;
40 import org.sat4j.tools.SolutionFoundListener;
41
42 public final class SearchOptimizerListener extends
43 SearchListenerAdapter<IPBSolverService> {
44
45
46
47
48 private static final long serialVersionUID = 1L;
49
50 private IPBSolverService solverService;
51
52 private ObjectiveFunction obj;
53
54 private final SolutionFoundListener sfl;
55
56 private BigInteger currentValue;
57
58 public SearchOptimizerListener(SolutionFoundListener sfl) {
59 this.sfl = sfl;
60 }
61
62 @Override
63 public void init(IPBSolverService solverService) {
64 this.obj = solverService.getObjectiveFunction();
65 this.solverService = solverService;
66 this.currentValue = null;
67 }
68
69 @Override
70 public void solutionFound(int[] model, RandomAccessModel lazyModel) {
71 if (obj != null) {
72 this.currentValue = obj.calculateDegree(lazyModel);
73 System.out.println(ILauncherMode.CURRENT_OPTIMUM_VALUE_PREFIX
74 + this.currentValue);
75 this.solverService
76 .addAtMostOnTheFly(obj.getVars(), obj.getCoeffs(),
77 this.currentValue.subtract(BigInteger.ONE));
78 }
79 sfl.onSolutionFound(model);
80 }
81
82 @Override
83 public void end(Lbool result) {
84 if (result == Lbool.FALSE) {
85 sfl.onUnsatTermination();
86 System.out.println(solverService.getLogPrefix()
87 + "objective function=" + currentValue);
88 }
89 }
90
91 @Override
92 public String toString() {
93 return "Internal optimizer search listener";
94 }
95 }