public MaxView(IntVar a, IntVar b, Solver solver) {
super(a, b, solver);
int lb = Math.max(A.getLB(), B.getLB());
int ub = Math.max(A.getUB(), B.getUB());
LB.set(lb);
UB.set(ub);
SIZE.set(ub - lb + 1);
}
@Override
public void backPropagate(int mask) throws ContradictionException {
// one of the variable as changed externally, this involves a complete update of this
if (!EventType.isRemove(mask)) {
int elb = A.getLB() + B.getLB();
int eub = A.getUB() + B.getUB();
int ilb = LB.get();
int iub = UB.get();
int old_size = iub - ilb; // is == 0, then the view is already instantiated
boolean up = false, down = false;
EventType e = EventType.VOID;
if (elb > ilb) {
if (elb > iub) {
this.contradiction(this, MSG_LOW);
}
VALUES.clear(ilb - OFFSET, elb - OFFSET);
ilb = VALUES.nextSetBit(ilb - OFFSET) + OFFSET;
LB.set(ilb);
e = EventType.INCLOW;
down = true;
}
if (eub < iub) {
if (eub < ilb) {
this.contradiction(this, MSG_LOW);
}
VALUES.clear(eub - OFFSET + 1, iub - OFFSET + 1);
iub = VALUES.prevSetBit(iub - OFFSET + 1) + OFFSET;
UB.set(iub);
if (e != EventType.VOID) {
e = EventType.BOUND;
} else {
e = EventType.DECUPP;
}
up = true;
}
int size = VALUES.cardinality();
SIZE.set(size);
if (ilb > iub) {
this.contradiction(this, MSG_EMPTY);
}
if (down || size == 1) {
filterOnGeq(this, ilb);
}
if (up || size == 1) { // size == 1 means instantiation, then force filtering algo
filterOnLeq(this, iub);
}
if (ilb == iub) { // size == 1 means instantiation, then force filtering algo
if (old_size > 0) {
notifyPropagators(EventType.INSTANTIATE, this);
}
} else {
notifyPropagators(e, this);
}
}
}
@Override
public void backPropagate(int mask) throws ContradictionException {
// one of the variable as changed externally, this involves a complete update of this
// one of the variable as changed externally, this involves a complete update of this
if (!EventType.isRemove(mask)) {
int lA = A.getLB(), uA = A.getUB();
int lB = B.getLB(), uB = B.getUB();
int elb = Math.max(lA, lB);
int eub = Math.max(uA, uB);
int ilb = LB.get();
int iub = UB.get();
boolean change = false;
EventType e = EventType.VOID;
if (elb > ilb) {
if (elb > iub) {
this.contradiction(this, MSG_LOW);
}
SIZE.add(elb - ilb);
ilb = elb;
LB.set(ilb);
e = EventType.INCLOW;
change = true;
}
if (eub < iub) {
if (eub < ilb) {
this.contradiction(this, MSG_LOW);
}
SIZE.add(eub - iub);
iub = eub;
UB.set(iub);
if (e != EventType.VOID) {
e = EventType.BOUND;
} else {
e = EventType.DECUPP;
}
change |= true;
}
if (ilb > iub) {
this.contradiction(this, MSG_EMPTY);
}
if (change) {
if (ilb == iub) {
notifyPropagators(EventType.INSTANTIATE, this);
} else {
notifyPropagators(e, this);
}
}
}
}
@Override
public boolean removeValue(int value, ICause cause, boolean informCause)
throws ContradictionException {
ICause antipromo = cause;
if (informCause) {
cause = Cause.Null;
}
int inf = getLB();
int sup = getUB();
if (value == inf && value == sup) {
this.contradiction(cause, AbstractVariable.MSG_REMOVE);
} else if (inf == value || value == sup) {
EventType e;
if (value == inf) {
// todo: delta...
LB.set(value + 1);
e = EventType.INCLOW;
if (cause.reactOnPromotion()) {
cause = Cause.Null;
}
if (A.getLB() > B.getUB()) {
A.updateLowerBound(value + 1, this, false);
}
if (B.getLB() > A.getUB()) {
B.updateLowerBound(value + 1, this, false);
}
} else {
// todo: delta...
UB.set(value - 1);
e = EventType.DECUPP;
if (cause.reactOnPromotion()) {
cause = Cause.Null;
}
A.updateUpperBound(value - 1, this, false);
B.updateUpperBound(value - 1, this, false);
}
if (SIZE.get() > 0) {
if (this.instantiated()) {
e = EventType.INSTANTIATE;
if (cause.reactOnPromotion()) {
cause = Cause.Null;
}
}
this.notifyPropagators(e, cause);
} else if (SIZE.get() == 0) {
this.contradiction(cause, MSG_EMPTY);
}
return true;
}
return false;
}
public BitsetXYSumView(IntVar a, IntVar b, Solver solver) {
super(a, b, solver);
int lbA = A.getLB();
int ubA = A.getUB();
int lbB = B.getLB();
int ubB = B.getUB();
OFFSET = lbA + lbB;
VALUES = solver.getEnvironment().makeBitSet((ubA + ubB) - (lbA + lbB) + 1);
DisposableRangeIterator itA = A.getRangeIterator(true);
DisposableRangeIterator itB = B.getRangeIterator(true);
while (itA.hasNext()) {
itB.bottomUpInit();
while (itB.hasNext()) {
VALUES.set(itA.min() + itB.min() - OFFSET, itA.max() + itB.max() - OFFSET + 1);
itB.next();
}
itB.dispose();
itA.next();
}
itA.dispose();
SIZE.set(VALUES.cardinality());
}
@Override
public boolean updateLowerBound(int aValue, ICause cause, boolean informCause)
throws ContradictionException {
ICause antipromo = cause;
if (informCause) {
cause = Cause.Null;
}
int old = this.getLB();
if (old < aValue) {
if (this.getUB() < aValue) {
this.contradiction(cause, MSG_LOW);
} else {
EventType e = EventType.INCLOW;
// todo delta
SIZE.add(old - aValue);
LB.set(aValue);
if (A.getLB() > B.getUB()) {
A.updateLowerBound(aValue, this, false);
}
if (B.getLB() > A.getUB()) {
B.updateLowerBound(aValue, this, false);
}
if (instantiated()) {
e = EventType.INSTANTIATE;
if (cause.reactOnPromotion()) {
cause = Cause.Null;
}
}
this.notifyPropagators(e, cause);
return true;
}
}
return false;
}