private void refresh(RNode part1, RNode part2) throws DimensionalException {
if (part1 == root) {
if (part2 != null) {
// build new root and add children.
root = makeRoot(false);
root.addChild(part1);
part1.setParent(root);
root.addChild(part2);
part2.setParent(root);
}
update(root);
return;
}
update(part1);
if (part2 != null) {
update(part2);
if (part1.getParent().getChildren().size() > M_order) {
RNode[] splits = makePartition(part1.getParent());
refresh(splits[0], splits[1]);
}
}
if (part1.getParent() != null) {
refresh(part1.getParent(), null);
}
}
private RNode[] makePartition(RNode n) throws DimensionalException {
numOfPartitions++;
numOfNodes += 2;
RNode[] parts = new RNode[] {n, new RNode(n.getMbr(), n.isLeaf(), M_order)};
parts[1].setParent(n.getParent());
if (parts[1].getParent() != null) {
parts[1].getParent().children().add(parts[1]);
}
List<RNode> cpyc = new LinkedList<RNode>(n.children());
n.children().clear();
RNode[] seeds = getSeeds(cpyc);
parts[0].children().add(seeds[0]);
parts[1].children().add(seeds[1]);
update(parts[0]);
update(parts[1]);
while (!cpyc.isEmpty()) {
if (parts[0].missingEntries(m_order) == 0
&& parts[1].missingEntries(m_order) + cpyc.size() == m_order) {
parts[1].children().addAll(cpyc);
cpyc.clear();
update(parts[0]);
update(parts[1]);
return parts;
} else if (parts[1].missingEntries(m_order) == 0
&& parts[0].missingEntries(m_order) + cpyc.size() == m_order) {
parts[0].children().addAll(cpyc);
cpyc.clear();
update(parts[0]);
update(parts[1]);
return parts;
}
RNode next = chooseNext(cpyc, seeds), chosen;
double enl1 = getEnlargement(parts[0], next);
double enl2 = getEnlargement(parts[1], next);
if (enl1 < enl2) chosen = parts[0];
else if (enl2 < enl1) chosen = parts[1];
else {
double ar1 = parts[0].getMbr().getArea();
double ar2 = parts[1].getMbr().getArea();
if (ar1 < ar2) chosen = parts[0];
else if (ar2 < ar1) chosen = parts[1];
else {
if (parts[0].children().size() < parts[1].children().size()) chosen = parts[0];
else if (parts[0].children().size() > parts[1].children().size()) chosen = parts[1];
else chosen = parts[new Random().nextInt(2)];
}
}
chosen.children().add(next);
update(chosen);
}
return parts;
}
