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| package org.sat4j.reader.csp; |
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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.ISolver; |
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| import org.sat4j.specs.IVec; |
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| import org.sat4j.specs.IVecInt; |
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| public class SupportsDirectEncoding implements Relation { |
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| protected final int arity; |
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| protected int[][] tuples; |
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| private IVecInt clause; |
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| private int lastmatch; |
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| |
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0
| public SupportsDirectEncoding(int arity, int nbtuples) {
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0
| this.arity = arity;
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0
| tuples = new int[nbtuples][];
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| } |
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| |
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| public void addTuple(int index, int[] tuple) {
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| tuples[index] = tuple;
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| } |
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| |
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| public void toClause(ISolver solver, IVec<Var> scope, IVec<Evaluable> vars)
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| throws ContradictionException { |
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| |
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0
| clause = new VecInt();
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32 |
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| int[] tuple = new int[vars.size()];
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| lastmatch=-1;
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| find(tuple, 0, scope,vars, solver);
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| } |
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| |
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| private void find(int[] tuple, int n, IVec<Var> scope, IVec<Evaluable> vars, ISolver solver)
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| throws ContradictionException { |
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0
| if (n == vars.size()) {
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40 |
0
| if (notPresent(tuple)) {
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| clause.clear();
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| for (int j = 0; j < vars.size(); j++) {
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| clause.push(-vars.get(j).translate(tuple[j]));
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| } |
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| |
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| solver.addClause(clause);
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| } |
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| } else { |
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0
| int[] domain = vars.get(n).domain();
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0
| for (int i = 0; i < domain.length; i++) {
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0
| tuple[n] = domain[i];
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| find(tuple, n + 1, scope,vars, solver);
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| } |
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| |
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| } |
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| |
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| } |
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0
| private boolean notPresent(int[] tuple) {
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| int i = lastmatch+1;
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| int j = 0;
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| while (i<tuples.length&&j < tuple.length) {
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0
| if (tuples[i][j] < tuple[j]) {
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| i++;
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| j = 0;
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0
| continue;
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| } |
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0
| if (tuples[i][j] > tuple[j])
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| return true;
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| j++;
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| } |
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0
| if (j==tuple.length) {
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0
| lastmatch=i;
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| return false;
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| } |
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| return true;
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| } |
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| |
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0
| public int arity() {
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0
| return arity;
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| } |
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| } |
