@Override
public void check(final Node node) {
// Store snapshot from last check
if (stateMachine.getLastNode() != null) {
history.store(
stateMachine.getLastNode(), currentGroupify, stateMachine.getLastTransition().snapshot);
}
// Transition
final Transition transition = stateMachine.transition(node);
// Switch groupifies
final IHashGroupify temp = lastGroupify;
lastGroupify = currentGroupify;
currentGroupify = temp;
currentGroupify.clear();
// Apply transition
switch (transition.type) {
case UNOPTIMIZED:
currentGroupify =
transformer.apply(transition.projection, node.getTransformation(), currentGroupify);
break;
case ROLLUP:
currentGroupify =
transformer.applyRollup(
transition.projection, node.getTransformation(), lastGroupify, currentGroupify);
break;
case SNAPSHOT:
currentGroupify =
transformer.applySnapshot(
transition.projection,
node.getTransformation(),
currentGroupify,
transition.snapshot);
break;
}
// Mark as checked
node.setChecked();
// Propagate k-anonymity
node.setKAnonymous(currentGroupify.isKAnonymous());
// Propagate anonymity and information loss
if (currentGroupify.isAnonymous()) {
node.setAnonymous(true);
metric.evaluate(node, currentGroupify);
} else {
node.setInformationLoss(null);
node.setAnonymous(false);
}
}
