private IEnumerable <object> DetectNavigationChange(StateEntry entry, INavigation navigation, Sidecar snapshot) { var snapshotValue = snapshot[navigation]; var currentValue = entry[navigation]; var stateManager = entry.StateManager; var added = new HashSet <object>(ReferenceEqualityComparer.Instance); if (navigation.IsCollection()) { var snapshotCollection = (IEnumerable)snapshotValue; var currentCollection = (IEnumerable)currentValue; var removed = new HashSet <object>(ReferenceEqualityComparer.Instance); if (snapshotCollection != null) { foreach (var entity in snapshotCollection) { removed.Add(entity); } } if (currentCollection != null) { foreach (var entity in currentCollection) { if (!removed.Remove(entity)) { added.Add(entity); } } } if (added.Any() || removed.Any()) { stateManager.Notify.NavigationCollectionChanged(entry, navigation, added, removed); snapshot.TakeSnapshot(navigation); } } else if (!ReferenceEquals(currentValue, snapshotValue)) { stateManager.Notify.NavigationReferenceChanged(entry, navigation, snapshotValue, currentValue); if (currentValue != null) { added.Add(currentValue); } snapshot.TakeSnapshot(navigation); } return(added); }
private void DetectKeyChange(StateEntry entry, IProperty property, Sidecar snapshot) { if (!snapshot.HasValue(property)) { return; } // TODO: Perf: make it fast to check if a property is part of any key var isPrimaryKey = property.IsPrimaryKey(); var isPrincipalKey = _model.Service.GetReferencingForeignKeys(property).Any(); var isForeignKey = property.IsForeignKey(); if (isPrimaryKey || isPrincipalKey || isForeignKey) { var snapshotValue = snapshot[property]; var currentValue = entry[property]; // Note that mutation of a byte[] key is not supported or detected, but two different instances // of byte[] with the same content must be detected as equal. if (!StructuralComparisons.StructuralEqualityComparer.Equals(currentValue, snapshotValue)) { if (isForeignKey) { entry.StateManager.Notify.ForeignKeyPropertyChanged(entry, property, snapshotValue, currentValue); } if (isPrimaryKey) { entry.StateManager.UpdateIdentityMap(entry, snapshot.GetPrimaryKeyValue()); } if (isPrincipalKey) { entry.StateManager.Notify.PrincipalKeyPropertyChanged(entry, property, snapshotValue, currentValue); } snapshot.TakeSnapshot(property); } } }