@Override
public BranchingDecision getDecision(Decision decision, boolean isLeft) {
BranchingDecision br = super.getDecision(decision, isLeft);
if (!isLeft) {
// a refutation is explained thanks to the previous ones which are refutable
if (decision != RootDecision.ROOT) {
Explanation explanation = database.get(br.getId());
if (explanation == null) {
explanation = new Explanation();
} else {
explanation.reset();
}
Decision d = decision.getPrevious();
while ((d != RootDecision.ROOT)) {
if (d.hasNext()) {
explanation.add(d.getPositiveDeduction());
}
d = d.getPrevious();
}
this.store(br, explanation);
}
}
return br;
}
@Override
public void explain(ExplanationEngine xengine, Deduction d, Explanation e) {
// return super.explain(d);
if (d.getVar() == x) {
e.add(xengine.getPropagatorActivation(this));
if (d.getmType() == Deduction.Type.ValRem) {
y.explain(xengine, VariableState.REM, ((ValueRemoval) d).getVal() - cste, e);
} else {
throw new UnsupportedOperationException(
"PropEqualXY only knows how to explain ValueRemovals");
}
} else if (d.getVar() == y) {
e.add(xengine.getPropagatorActivation(this));
if (d.getmType() == Deduction.Type.ValRem) {
x.explain(xengine, VariableState.REM, ((ValueRemoval) d).getVal() + cste, e);
} else {
throw new UnsupportedOperationException(
"PropEqualXY only knows how to explain ValueRemovals");
}
} else {
super.explain(xengine, d, e);
}
}
