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| package org.sat4j.opt; |
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| import org.sat4j.core.VecInt; |
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| import org.sat4j.specs.ContradictionException; |
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| import org.sat4j.specs.IOptimizationProblem; |
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| import org.sat4j.specs.ISolver; |
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| import org.sat4j.specs.IVecInt; |
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| import org.sat4j.specs.TimeoutException; |
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| import org.sat4j.tools.SolverDecorator; |
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| public class MinOneDecorator extends SolverDecorator implements |
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| IOptimizationProblem { |
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| private static final long serialVersionUID = 1L; |
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| private int[] prevmodel; |
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| public MinOneDecorator(ISolver solver) {
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| super(solver);
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| } |
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| public boolean admitABetterSolution() throws TimeoutException {
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| boolean result = isSatisfiable();
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| if (result) {
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| prevmodel = super.model();
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| } |
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| return result;
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| } |
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| public boolean hasNoObjectiveFunction() {
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| return false;
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| } |
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| public boolean nonOptimalMeansSatisfiable() {
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| return true;
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| } |
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| private int counter; |
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0
| public Number calculateObjective() {
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| counter = 0;
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| for (int p : prevmodel) {
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| if (p > 0) {
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| counter++;
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| } |
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| } |
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| return counter;
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| } |
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| private final IVecInt literals = new VecInt(); |
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| public void discard() throws ContradictionException {
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0
| if (literals.isEmpty()) {
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| for (int i = 1; i <= nVars(); i++) {
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| literals.push(i);
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| } |
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| } |
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| addAtMost(literals, counter - 1);
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| } |
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| @Override
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| public int[] model() { |
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| return prevmodel;
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| } |
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| @Override
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| public void reset() { |
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| literals.clear();
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| super.reset();
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| } |
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| } |
