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| package org.sat4j.tools; |
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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.IConstr; |
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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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| |
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| public class MaxSatDecorator extends SolverDecorator { |
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| |
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| private int nborigvars; |
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| |
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| private int nbexpectedclauses; |
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| |
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| private int nbnewvar; |
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| |
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| private int[] prevmodel; |
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| |
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0
| public MaxSatDecorator(ISolver solver) {
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0
| super(solver);
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| } |
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| |
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0
| @Override
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| public boolean isSatisfiable() throws TimeoutException { |
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0
| if (super.isSatisfiable()) {
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| prevmodel = null;
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| IVecInt vec = new VecInt();
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| try {
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| do {
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| prevmodel = super.model();
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| vec.clear();
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| for (int i = nborigvars+1; i <= nVars(); i++) {
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| vec.push(i);
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| } |
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| int counter = 0;
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| for (int q : prevmodel) {
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| if (q > nborigvars) {
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| counter++;
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| } |
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| } |
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| if (counter == 0) {
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| return true;
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| } |
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| super.addAtMost(vec, counter - 1);
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| System.out.println("o " + counter);
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0
| } while (super.isSatisfiable());
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| } catch (TimeoutException e) { |
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| System.err.println("Solver timed out");
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| } catch (ContradictionException e) { |
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| System.err.println("added trivial unsat clauses?" + vec);
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| } |
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| } |
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| return false;
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| } |
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| |
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0
| @Override
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| public int[] model() { |
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| return prevmodel;
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| } |
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| |
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| @Override
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| public int newVar(int howmany) { |
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| nborigvars = super.newVar(howmany);
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| return nborigvars;
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| } |
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| @Override
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| public void setExpectedNumberOfClauses(int nb) { |
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| nbexpectedclauses = nb;
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| super.setExpectedNumberOfClauses(nb);
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| super.newVar(nborigvars + nbexpectedclauses);
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| } |
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| |
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| @Override
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| public IConstr addClause(IVecInt literals) throws ContradictionException { |
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| literals.push(nborigvars + nbnewvar++);
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| return super.addClause(literals);
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| } |
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| |
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| @Override
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| public void reset() { |
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| nbnewvar = 0;
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| super.reset();
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| } |
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| } |
