/// <summary>
/// Method is done as a cleanup, when a resource is deleted, this method will remove the deleted object from an entityInstance reference property
/// </summary>
/// <param name="targetResource">Resource to look for in the currentEntityInstance</param>
/// <param name="property">Reference property to look in on the currentEntityInstance</param>
/// <param name="currentEntityInstance">currentEntityInstance that may contain the targetResource</param>
private void SetEntityReferenceToNullOnTargetResourceMatch(ResourceInstance targetResource, ResourceProperty property, ResourceInstance currentEntityInstance)
{
ExceptionUtilities.CheckArgumentNotNull(targetResource, "targetResource");
ExceptionUtilities.CheckArgumentNotNull(property, "property");
ExceptionUtilities.CheckArgumentNotNull(currentEntityInstance, "currentEntityInstance");
ExceptionUtilities.Assert(property.Kind == ResourcePropertyKind.ResourceReference, "Should only be called with reference properties");
string propertyName = property.Name;
object propertyValue;
if (currentEntityInstance.TryGetValue(propertyName, out propertyValue) && propertyValue == targetResource)
{
this.pendingChanges.Add(() => currentEntityInstance[propertyName] = null);
}
}
private void AddReferenceToCollection_Internal(ResourceInstance targetResource, string propertyName, ResourceInstance resourceToBeAdded, bool addBackReference)
{
ExceptionUtilities.CheckArgumentNotNull(targetResource, "targetResource");
ExceptionUtilities.CheckArgumentNotNull(propertyName, "propertyName");
ExceptionUtilities.CheckArgumentNotNull(resourceToBeAdded, "resourceToBeAdded");
var resourceType = this.metadataHelper.ResourceTypes.Single(t => t.FullName == targetResource.ResourceTypeName);
var property = resourceType.GetAllPropertiesLazily().SingleOrDefault(p => p.Name == propertyName);
ExceptionUtilities.CheckObjectNotNull(property, "Could not find resource property '{0}' on resource type '{1}'", propertyName, resourceType.FullName);
ExceptionUtilities.Assert(property.Kind == ResourcePropertyKind.ResourceSetReference, "AddReferenceToCollection called on property '{0}' with kind '{1}'", propertyName, property.Kind);
object propertyValue;
if (!targetResource.TryGetValue(propertyName, out propertyValue))
{
Type collectionType = this.GetCollectionPropertyType(targetResource.ResourceTypeName, propertyName);
ExceptionUtilities.CheckObjectNotNull(collectionType, "Could not get collection type for '{0}.{1}'", targetResource.ResourceTypeName, propertyName);
targetResource[propertyName] = propertyValue = Activator.CreateInstance(collectionType);
}
// Check to see if item already exists
var collection = (IEnumerable)propertyValue;
foreach (var existingEntity in collection)
{
if (this.AreKeysEqual(resourceToBeAdded, (ResourceInstance)existingEntity))
{
// TODO: throw?
return;
}
}
var addMethod = collection.GetType().GetMethod("Add");
ExceptionUtilities.CheckObjectNotNull(addMethod, "Could not find 'Add' method on collection of type: " + collection.GetType());
addMethod.Invoke(collection, new object[] { resourceToBeAdded });
if (addBackReference)
{
this.SetReverseNavigation(targetResource, resourceToBeAdded, propertyName, false);
}
}
/// <summary>
/// Method is done as a cleanup, when a resource is deleted, this method will remove the deleted object from an entityInstance collection property
/// </summary>
/// <param name="targetResource">Resource to look for in the currentEntityInstance</param>
/// <param name="property">The collection property to remove from</param>
/// <param name="currentEntityInstance">currentEntityInstance that may contain the targetResource</param>
private void RemoveResourceFromCollectionOnTargetResourceMatch(ResourceInstance targetResource, ResourceProperty property, ResourceInstance currentEntityInstance)
{
ExceptionUtilities.CheckArgumentNotNull(targetResource, "targetResource");
ExceptionUtilities.CheckArgumentNotNull(property, "property");
ExceptionUtilities.CheckArgumentNotNull(currentEntityInstance, "currentEntityInstance");
ExceptionUtilities.Assert(property.Kind == ResourcePropertyKind.ResourceSetReference, "Should only be called with reference properties");
string propertyName = property.Name;
object propertyValue;
if (!currentEntityInstance.TryGetValue(propertyName, out propertyValue))
{
return;
}
IEnumerable childCollectionObject = propertyValue as IEnumerable;
ExceptionUtilities.CheckObjectNotNull(childCollectionObject, "Value of '{0}.{1}' was null or not a collection", currentEntityInstance.ResourceTypeName, propertyName);
var removeMethod = childCollectionObject.GetType().GetMethod("Remove");
ExceptionUtilities.CheckObjectNotNull(removeMethod, "Could not find remove method for collection property '{0}.{1}'", currentEntityInstance.ResourceTypeName, propertyName);
if (childCollectionObject.Cast<object>().Any(o => o == targetResource))
{
this.pendingChanges.Add(() => removeMethod.Invoke(childCollectionObject, new object[] { targetResource }));
}
}
private void SetReference_Internal(ResourceInstance targetResource, string propertyName, ResourceInstance propertyValue, bool setBackReference)
{
ExceptionUtilities.CheckArgumentNotNull(targetResource, "targetResource");
ExceptionUtilities.CheckArgumentNotNull(propertyName, "propertyName");
var resourceType = this.metadataHelper.ResourceTypes.Single(t => t.FullName == targetResource.ResourceTypeName);
var property = resourceType.GetAllPropertiesLazily().SingleOrDefault(p => p.Name == propertyName);
ExceptionUtilities.CheckObjectNotNull(property, "Could not find resource property '{0}' on resource type '{1}'", propertyName, resourceType.FullName);
ExceptionUtilities.Assert(property.Kind == ResourcePropertyKind.ResourceReference, "SetReference called on property '{0}' with kind '{1}'", propertyName, property.Kind);
object oldValue;
if (!targetResource.TryGetValue(propertyName, out oldValue))
{
oldValue = null;
}
targetResource[propertyName] = propertyValue;
if (setBackReference)
{
if (propertyValue == null)
{
propertyValue = (ResourceInstance)oldValue;
}
if (propertyValue != null)
{
this.SetReverseNavigation(targetResource, propertyValue, propertyName, (propertyValue == null));
}
}
}