/// <summary>
/// Adds the specified entity type and any associated entity types recursively to the specified set.
/// </summary>
/// <param name="entityType">The entity Type to add.</param>
/// <param name="entityTypes">The types set to accumulate in.</param>
/// <param name="metadataProvider">The metadata provider.</param>
private static void AddEntityType(Type entityType, HashSet <Type> entityTypes, MetadataProvider metadataProvider)
{
if (entityTypes.Contains(entityType))
{
// already added this type
return;
}
entityTypes.Add(entityType);
RegisterDataControllerTypeDescriptionProvider(entityType, metadataProvider);
foreach (PropertyDescriptor pd in TypeDescriptor.GetProperties(entityType))
{
// for any "exposed" association members, recursively add the associated
// entity type
if (pd.Attributes[typeof(AssociationAttribute)] != null && TypeUtility.IsDataMember(pd))
{
Type includedEntityType = TypeUtility.GetElementType(pd.PropertyType);
if (metadataProvider.IsEntityType(entityType))
{
AddEntityType(includedEntityType, entityTypes, metadataProvider);
}
}
}
// Recursively add any derived entity types specified by [KnownType]
// attributes
IEnumerable <Type> knownTypes = TypeUtility.GetKnownTypes(entityType, true);
foreach (Type knownType in knownTypes)
{
if (entityType.IsAssignableFrom(knownType))
{
AddEntityType(knownType, entityTypes, metadataProvider);
}
}
}
private static DataControllerDescription CreateDescription(HttpControllerDescriptor controllerDescriptor)
{
Type dataControllerType = controllerDescriptor.ControllerType;
MetadataProvider metadataProvider = CreateMetadataProvider(dataControllerType);
// get all public candidate methods and create the operations
HashSet <Type> entityTypes = new HashSet <Type>();
List <UpdateActionDescriptor> actions = new List <UpdateActionDescriptor>();
IEnumerable <MethodInfo> methodsToInspect =
dataControllerType.GetMethods(BindingFlags.Instance | BindingFlags.Public)
.Where(p => (p.DeclaringType != typeof(DataController) && (p.DeclaringType != typeof(object))) && !p.IsSpecialName);
foreach (MethodInfo method in methodsToInspect)
{
if (method.GetCustomAttributes(typeof(NonActionAttribute), false).Length > 0)
{
continue;
}
if (method.IsVirtual && method.GetBaseDefinition().DeclaringType == typeof(DataController))
{
// don't want to infer overrides of DataController virtual methods as
// operations
continue;
}
// We need to ensure the buddy metadata provider is registered BEFORE we
// attempt to do convention, since we rely on IsEntity which relies on
// KeyAttributes being present (possibly from "buddy" classes)
RegisterAssociatedMetadataProvider(method);
ChangeOperation operationType = ClassifyUpdateOperation(method, metadataProvider);
if (operationType != ChangeOperation.None)
{
Type entityType = method.GetParameters()[0].ParameterType;
UpdateActionDescriptor actionDescriptor = new UpdateActionDescriptor(controllerDescriptor, method, entityType, operationType);
ValidateAction(actionDescriptor);
actions.Add(actionDescriptor);
// TODO : currently considering entity types w/o any query methods
// exposing them. Should we?
if (metadataProvider.IsEntityType(entityType))
{
AddEntityType(entityType, entityTypes, metadataProvider);
}
}
else
{
// if the method is a "query" operation returning an entity,
// add to entity types
if (method.ReturnType != typeof(void))
{
Type returnType = TypeUtility.UnwrapTaskInnerType(method.ReturnType);
Type elementType = TypeUtility.GetElementType(returnType);
if (metadataProvider.IsEntityType(elementType))
{
AddEntityType(elementType, entityTypes, metadataProvider);
}
}
}
}
return(new DataControllerDescription(dataControllerType, entityTypes, actions));
}
/// <summary>
/// Adds the specified associated entities to the specified association member for the specified entity.
/// </summary>
/// <param name="entity">The entity</param>
/// <param name="associationProperty">The association member (singleton or collection)</param>
/// <param name="associatedEntities">Collection of associated entities</param>
private static void SetAssociationMember(object entity, PropertyDescriptor associationProperty, IEnumerable <object> associatedEntities)
{
if (associatedEntities.Count() == 0)
{
return;
}
object associationValue = associationProperty.GetValue(entity);
if (typeof(IEnumerable).IsAssignableFrom(associationProperty.PropertyType))
{
if (associationValue == null)
{
throw Error.InvalidOperation(Resource.DataController_AssociationCollectionPropertyIsNull, associationProperty.ComponentType.Name, associationProperty.Name);
}
IList list = associationValue as IList;
IEnumerable <object> associationSequence = null;
MethodInfo addMethod = null;
if (list == null)
{
// not an IList, so we have to use reflection
Type associatedEntityType = TypeUtility.GetElementType(associationValue.GetType());
addMethod = associationValue.GetType().GetMethod("Add", BindingFlags.Public | BindingFlags.Instance, null, new Type[] { associatedEntityType }, null);
if (addMethod == null)
{
throw Error.InvalidOperation(Resource.DataController_InvalidCollectionMember, associationProperty.Name);
}
associationSequence = ((IEnumerable)associationValue).Cast <object>();
}
foreach (object associatedEntity in associatedEntities)
{
// add the entity to the collection if it's not already there
if (list != null)
{
if (!list.Contains(associatedEntity))
{
list.Add(associatedEntity);
}
}
else
{
if (!associationSequence.Contains(associatedEntity))
{
addMethod.Invoke(associationValue, new object[] { associatedEntity });
}
}
}
}
else
{
// set the reference if it's not already set
object associatedEntity = associatedEntities.Single();
object currentValue = associationProperty.GetValue(entity);
if (!Object.Equals(currentValue, associatedEntity))
{
associationProperty.SetValue(entity, associatedEntity);
}
}
}
