public Tuple get(RowKey key) {
AssociationOperation result = currentState.get(key);
if (result == null) {
return cleared ? null : snapshot.get(key);
} else if (result.getType() == PUT_NULL || result.getType() == REMOVE) {
return null;
}
return result.getValue();
}
public int size() {
int size = cleared ? 0 : snapshot.size();
for (Map.Entry<RowKey, AssociationOperation> op : currentState.entrySet()) {
switch (op.getValue().getType()) {
case PUT:
case PUT_NULL:
if (cleared || !snapshot.containsKey(op.getKey())) {
size++;
}
break;
case REMOVE:
if (!cleared && snapshot.containsKey(op.getKey())) {
size--;
}
break;
}
}
return size;
}
public boolean isEmpty() {
int snapshotSize = cleared ? 0 : snapshot.size();
// nothing in both
if (snapshotSize == 0 && currentState.isEmpty()) {
return true;
}
// snapshot bigger than changeset
if (snapshotSize > currentState.size()) {
return false;
}
return size() == 0;
}
public Set<RowKey> getKeys() {
Set<RowKey> keys = new HashSet<RowKey>();
if (!cleared) {
keys.addAll(snapshot.getRowKeys());
}
for (Map.Entry<RowKey, AssociationOperation> op : currentState.entrySet()) {
switch (op.getValue().getType()) {
case PUT:
case PUT_NULL:
keys.add(op.getKey());
break;
case REMOVE:
keys.remove(op.getKey());
break;
}
}
return keys;
}
