@Override
public int compareHeads(int head1, int head2) {
if (head1 == head2) {
return 0;
}
Collection<VcsRef> refs1 = myRefsModel.refsToCommit(head1);
Collection<VcsRef> refs2 = myRefsModel.refsToCommit(head2);
boolean firstEmpty = isEmptyRefs(refs1, head1);
boolean secondEmpty = isEmptyRefs(refs2, head2);
if (firstEmpty && secondEmpty) {
return 0;
}
if (firstEmpty) {
return -1;
}
if (secondEmpty) {
return 1;
}
VcsLogRefManager refManager1 = getRefManager(refs1);
VcsLogRefManager refManager2 = getRefManager(refs2);
if (!refManager1.equals(refManager2)) {
return 0;
}
Map<VcsRef, Boolean> positions = ContainerUtil.newHashMap();
for (VcsRef ref : refs1) {
positions.put(ref, true);
}
for (VcsRef ref : refs2) {
positions.put(ref, false);
}
VcsRef firstRef = refManager1.sort(positions.keySet()).get(0);
return positions.get(firstRef) ? 1 : -1;
}
