public void moveTo(Criterion newParent) {
if (parent == null) {
if (newParent != null) {
parent = newParent;
parent.getChildren().add(this);
}
} else { // parent != null
if (!parent.equals(newParent)) {
parent.getChildren().remove(this);
parent = newParent;
if (parent != null) {
parent.getChildren().add(this);
}
}
}
}