private static bool TryGetElementTypeReference(
this IEdmTypeReference typeReference, out IEdmTypeReference elementTypeReference)
{
if (!typeReference.IsCollection())
{
elementTypeReference = null;
return false;
}
elementTypeReference = typeReference.AsCollection().ElementType();
return true;
}
internal static IEdmCollectionTypeReference AsCollectionOrNull(this IEdmTypeReference typeReference)
{
if (typeReference == null)
{
return null;
}
if (typeReference.TypeKind() != EdmTypeKind.Collection)
{
return null;
}
IEdmCollectionTypeReference reference = typeReference.AsCollection();
if (!reference.IsNonEntityODataCollectionTypeKind())
{
return null;
}
return reference;
}
/// <summary>
/// Casts an <see cref="IEdmTypeReference"/> to a <see cref="IEdmCollectionTypeReference"/> or returns null if this is not supported.
/// </summary>
/// <param name="typeReference">The type reference to convert.</param>
/// <returns>An <see cref="IEdmCollectionTypeReference"/> instance or null if the <paramref name="typeReference"/> cannot be converted.</returns>
internal static IEdmCollectionTypeReference AsCollectionOrNull(this IEdmTypeReference typeReference)
{
DebugUtils.CheckNoExternalCallers();
if (typeReference == null)
{
return null;
}
if (typeReference.TypeKind() != EdmTypeKind.Collection)
{
return null;
}
IEdmCollectionTypeReference collectionTypeReference = typeReference.AsCollection();
if (!collectionTypeReference.IsNonEntityODataCollectionTypeKind())
{
return null;
}
return collectionTypeReference;
}
/// <summary>
/// Get the <see cref="IEdmEntityTypeReference"/> of the item type of the <paramref name="typeReference"/>.
/// </summary>
/// <param name="typeReference">The collection type to get the item type for.</param>
/// <returns>The item type of the <paramref name="typeReference"/>.</returns>
public static IEdmTypeReference GetCollectionItemType(this IEdmTypeReference typeReference)
{
IEdmCollectionTypeReference collectionType = typeReference.AsCollection();
return collectionType == null ? null : collectionType.ElementType();
}
/// <summary>
/// Constructs a new type reference with the specified nullable value
/// </summary>
/// <param name="typeReference">The original type reference</param>
/// <param name="isNullable">The nullable value</param>
/// <returns>A new type reference, with the specified nullable value</returns>
public static IEdmTypeReference Nullable(this IEdmTypeReference typeReference, bool isNullable)
{
switch (typeReference.TypeKind())
{
case EdmTypeKind.Collection:
var collection = typeReference.AsCollection();
return new EdmCollectionTypeReference(collection.CollectionDefinition());
case EdmTypeKind.Complex:
var complex = typeReference.AsComplex();
return new EdmComplexTypeReference(complex.ComplexDefinition(), isNullable);
case EdmTypeKind.Entity:
var entity = typeReference.AsEntity();
return new EdmEntityTypeReference(entity.EntityDefinition(), isNullable);
case EdmTypeKind.EntityReference:
var entityRef = typeReference.AsEntityReference();
return new EdmEntityReferenceTypeReference(entityRef.EntityReferenceDefinition(), isNullable);
case EdmTypeKind.Primitive:
var primitive = (EdmPrimitiveTypeReference)typeReference.AsPrimitive();
return primitive.Nullable(isNullable);
default:
throw new TaupoInvalidOperationException("Unexpected Edm Type Kind: " + typeReference.TypeKind());
}
}