/// <summary>
/// Rebinds a resource to a new entity type
/// </summary>
/// <typeparam name="T">The new entity type to bind to</typeparam>
/// <param name="beo">The existing entity object to be rebound</param>
/// <returns>An instance of <typeparamref name="T"/> that is bound to the same underlying resource as <paramref name="beo"/>.</returns>
public T Become <T>(BrightstarEntityObject beo)
{
if (!Mappings.IsKnownInterface(typeof(T)))
{
throw new MappingNotFoundException(typeof(T));
}
var implType = Mappings.GetImplType(typeof(T));
List <BrightstarEntityObject> trackedObjects;
if (_trackedObjects.TryGetValue(beo.DataObject.Identity, out trackedObjects))
{
var ret = trackedObjects.OfType <T>().FirstOrDefault();
if (ret != null)
{
return(ret);
}
}
var dataObject = beo.DataObject;
foreach (var typeUri in Mappings.MapTypeToUris(implType))
{
var typeDo = GetDataObject(new Uri(typeUri), false);
dataObject.AddProperty(DataObject.TypeDataObject, typeDo);
}
return((T)Activator.CreateInstance(implType, this, beo.DataObject));
}
internal void UntrackObject(BrightstarEntityObject obj)
{
if (_trackedObjects.ContainsKey(obj.DataObject.Identity))
{
_trackedObjects.Remove(obj.DataObject.Identity);
}
_store.DetachDataObject(obj.DataObject);
}
/// <summary>
/// Creates a new entity collection
/// </summary>
/// <param name="context">The context that manages the entities</param>
/// <param name="parent">The parent entity that contains this collection</param>
/// <param name="propertyType">The property type that the collection maps to</param>
/// <param name="isInverse">True if the collection represents the inverse of <paramref name="propertyType"/></param>
public BrightstarEntityCollection(BrightstarEntityContext context, BrightstarEntityObject parent, string propertyType, bool isInverse = false) :
base(new EntityFrameworkCollectionQueryProvider(QueryParser.CreateDefault(), new EntityFrameworkQueryExecutor(context)))
{
_context = context;
_parent = parent;
_propertyTypeUri = propertyType;
_propertyType = _context.GetDataObject(new Uri(propertyType), false);
_isInverse = isInverse;
}
/// <summary>
/// Removes any reference to <paramref name="toRemove"/> from locally
/// tracked objects in this context.
/// </summary>
/// <param name="toRemove">The entity object that is to be removed</param>
/// <remarks>This method is used when <paramref name="toRemove"/> has been locally deleted
/// in the context.</remarks>
private void RemoveReferences(BrightstarEntityObject toRemove)
{
foreach (var trackedList in _trackedObjects.Values)
{
foreach (var tracked in trackedList)
{
tracked.RemoveReferences(toRemove);
}
}
}
/// <summary>
/// Removes a type identifier from a resource
/// </summary>
/// <typeparam name="T">The entity type whose type identifier is to be removed</typeparam>
/// <param name="beo">An existing entity bound to the resource to be updated</param>
public void Unbecome <T>(BrightstarEntityObject beo)
{
if (!Mappings.IsKnownInterface(typeof(T)))
{
throw new MappingNotFoundException(typeof(T));
}
var typeUri = Mappings.GetMappedInterfaceTypeUri(Mappings.GetImplType(typeof(T)));
if (!String.IsNullOrEmpty(typeUri))
{
var typeDo = GetDataObject(new Uri(typeUri), false);
beo.DataObject.RemoveProperty(DataObject.TypeDataObject, typeDo);
}
}
/// <summary>
///
/// </summary>
/// <param name="o"></param>
public void AddToLoadedObjects(BrightstarEntityObject o)
{
if (_loadedObjects == null)
{
// Still do the notification, even if the collection is not loaded
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, o, 0));
return;
}
if (!_loadedObjects.Any(x => x.DataObject.Identity.Equals(o.DataObject.Identity)))
{
_loadedObjects.Add(o);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, o, 0));
}
}
/// <summary>
/// Removes all references to the specified object from locally loaded properties
/// on this object.
/// </summary>
/// <param name="toRemove">The object to be removed</param>
/// <remarks>This method is used internally when an object is deleted to ensure that the object
/// is removed from the properties and property collections of all locally tracked object</remarks>
internal void RemoveReferences(BrightstarEntityObject toRemove)
{
var propertyNames = _currentPropertyValues.Where(p => p.Value.Equals(toRemove)).Select(p => p.Key).ToList();
foreach (var propertyName in propertyNames)
{
_currentPropertyValues.Remove(propertyName);
OnPropertyChanged(propertyName);
}
foreach (var c in _currentPropertyCollections.Values)
{
c.RemoveFromLoadedObjects(toRemove.Identity);
}
}
internal void UpdatePropertyCollection(string propertyName, BrightstarEntityObject objectToAdd, string identityToRemove)
{
IBrightstarEntityCollection cachedValue;
if (_currentPropertyCollections.TryGetValue(propertyName, out cachedValue))
{
if (identityToRemove != null)
{
cachedValue.RemoveFromLoadedObjects(identityToRemove);
}
if (objectToAdd != null)
{
cachedValue.AddToLoadedObjects(objectToAdd);
}
}
}
internal void TrackObject(BrightstarEntityObject obj)
{
List <BrightstarEntityObject> trackedObjects;
if (_trackedObjects.TryGetValue(obj.DataObject.Identity, out trackedObjects))
{
if (!trackedObjects.Contains(obj))
{
trackedObjects.Add(obj);
}
}
else
{
trackedObjects = new List <BrightstarEntityObject> {
obj
};
_trackedObjects[obj.DataObject.Identity] = trackedObjects;
}
}
/// <summary>
///
/// </summary>
/// <param name="o"></param>
public void AddToLoadedObjects(BrightstarEntityObject o)
{
if (_loadedObjects == null)
{
// Still do the notification, even if the collection is not loaded
#if WINDOWS_PHONE || PORTABLE
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, o, 0));
#else
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, o));
#endif
return;
}
if (!_loadedObjects.Any(x => x.DataObject.Identity.Equals(o.DataObject.Identity)))
{
_loadedObjects.Add(o);
#if WINDOWS_PHONE || PORTABLE
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, o, 0));
#else
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, o));
#endif
}
}
internal void UpdateProperty(string propertyName, BrightstarEntityObject newValue)
{
_currentPropertyValues[propertyName] = newValue;
}
internal LiteralsCollection(BrightstarEntityObject beo, string propertyTypeUri)
{
_beo = beo;
_propertyTypeUri = propertyTypeUri;
_isAttached = true;
}
internal void AddArc(BrightstarEntityObject subj, string propertyType, BrightstarEntityObject obj, bool overwrite)
{
if (overwrite)
{
subj.DataObject.SetProperty(propertyType, obj.DataObject);
}
else
{
subj.DataObject.AddProperty(propertyType, obj.DataObject);
}
foreach (var srcObject in GetTrackedObjects(subj.DataObject))
{
foreach (var srcProperty in GetArcProperties(srcObject.GetType(), propertyType))
{
if (IsCollectionProperty(srcProperty))
{
Type itemType = GetItemType(srcProperty);
if (itemType.IsAssignableFrom(obj.GetType()))
{
srcObject.UpdatePropertyCollection(srcProperty.Name, obj, null);
}
else
{
srcObject.UpdatePropertyCollection(srcProperty.Name, Bind(obj.DataObject, itemType) as BrightstarEntityObject, null);
}
}
else
{
var existing = srcProperty.GetValue(srcObject, null) as BrightstarEntityObject;
if (obj.Equals(existing))
{
continue;
}
if (srcProperty.PropertyType.Equals(obj.GetType()))
{
srcObject.UpdateProperty(srcProperty.Name, obj);
}
else
{
srcObject.UpdateProperty(srcProperty.Name, Bind(obj.DataObject, srcProperty.PropertyType) as BrightstarEntityObject);
}
}
}
}
foreach (var destObject in GetTrackedObjects(obj.DataObject))
{
foreach (var destProperty in GetInverseArcProperties(destObject.GetType(), propertyType))
{
if (IsCollectionProperty(destProperty))
{
Type itemType = GetItemType(destProperty);
if (itemType.IsAssignableFrom(subj.GetType()))
{
destObject.UpdatePropertyCollection(destProperty.Name, subj, null);
}
else
{
destObject.UpdatePropertyCollection(destProperty.Name,
Bind(subj.DataObject, itemType) as
BrightstarEntityObject, null);
}
}
else
{
var existing = destProperty.GetValue(destObject, null) as BrightstarEntityObject;
if (existing != null && subj.Equals(existing))
{
continue;
}
if (destProperty.PropertyType.IsAssignableFrom(subj.GetType()))
{
destObject.UpdateProperty(destProperty.Name, subj);
}
else
{
destObject.UpdateProperty(destProperty.Name,
Bind(subj.DataObject, destProperty.PropertyType) as
BrightstarEntityObject);
}
}
}
}
}
