public void add(final OIdentifiable identifiable) { if (identifiable == null) throw new NullPointerException("Impossible to add a null identifiable in a ridbag"); if (identifiable.getIdentity().isValid()) { Change counter = changes.get(identifiable); if (counter == null) changes.put(identifiable, new DiffChange(1)); else { if (counter.isUndefined()) { counter = getAbsoluteValue(identifiable); changes.put(identifiable, counter); } counter.increment(); } } else { final OModifiableInteger counter = newEntries.get(identifiable); if (counter == null) newEntries.put(identifiable, new OModifiableInteger(1)); else counter.increment(); } if (size >= 0) size++; if (this.owner != null) ORecordInternal.track(this.owner, identifiable); if (updateOwner) fireCollectionChangedEvent( new OMultiValueChangeEvent<OIdentifiable, OIdentifiable>( OMultiValueChangeEvent.OChangeType.ADD, identifiable, identifiable, null, false)); }