public void union(FlowSet otherFlow, FlowSet destFlow) {
if (sameType(otherFlow) && sameType(destFlow)) {
ArraySparseSet other = (ArraySparseSet) otherFlow;
ArraySparseSet dest = (ArraySparseSet) destFlow;
// For the special case that dest == other
if (dest == other) {
for (int i = 0; i < this.numElements; i++) dest.add(this.elements[i]);
}
// Else, force that dest starts with contents of this
else {
if (this != dest) copy(dest);
for (int i = 0; i < other.numElements; i++) dest.add(other.elements[i]);
}
} else super.union(otherFlow, destFlow);
}
public void difference(FlowSet otherFlow, FlowSet destFlow) {
if (sameType(otherFlow) && sameType(destFlow)) {
ArraySparseSet other = (ArraySparseSet) otherFlow;
ArraySparseSet dest = (ArraySparseSet) destFlow;
ArraySparseSet workingSet;
if (dest == other || dest == this) workingSet = new ArraySparseSet();
else {
workingSet = dest;
workingSet.clear();
}
for (int i = 0; i < this.numElements; i++) {
if (!other.contains(this.elements[i])) workingSet.add(this.elements[i]);
}
if (workingSet != dest) workingSet.copy(dest);
} else super.difference(otherFlow, destFlow);
}