private static bool TryGetCommonType(
PrimitiveType primitiveType1,
PrimitiveType primitiveType2,
out EdmType commonType)
{
commonType = (EdmType)null;
if (TypeSemantics.IsSubTypeOf(primitiveType1, primitiveType2))
{
commonType = (EdmType)primitiveType2;
return(true);
}
if (TypeSemantics.IsSubTypeOf(primitiveType2, primitiveType1))
{
commonType = (EdmType)primitiveType1;
return(true);
}
ReadOnlyCollection <PrimitiveType> commonSuperTypes = TypeSemantics.GetPrimitiveCommonSuperTypes(primitiveType1, primitiveType2);
if (commonSuperTypes.Count <= 0)
{
return(false);
}
commonType = (EdmType)commonSuperTypes[0];
return(true);
}
private static bool ValidateScalarTypesAreCompatible(TypeUsage cspaceType, TypeUsage storeType)
{
if (Helper.IsEnumType(cspaceType.EdmType))
{
return(TypeSemantics.IsSubTypeOf(TypeUsage.Create((EdmType)Helper.GetUnderlyingEdmTypeForEnumType(cspaceType.EdmType)), storeType));
}
return(TypeSemantics.IsSubTypeOf(cspaceType, storeType));
}
internal static bool IsValidPolymorphicCast(TypeUsage fromType, TypeUsage toType)
{
if (!TypeSemantics.IsPolymorphicType(fromType) || !TypeSemantics.IsPolymorphicType(toType))
{
return(false);
}
if (!TypeSemantics.IsStructurallyEqual(fromType, toType) && !TypeSemantics.IsSubTypeOf(fromType, toType))
{
return(TypeSemantics.IsSubTypeOf(toType, fromType));
}
return(true);
}
// <summary>
// Validates whether cspace and sspace types are compatible.
// </summary>
// <param name="cspaceType"> Type in C-Space. Must be a primitive or enumeration type. </param>
// <param name="storeType"> C-Space equivalent of S-space Type. Must be a primitive type. </param>
// <returns>
// <c>true</c> if the types are compatible. <c>false</c> otherwise.
// </returns>
// <remarks>
// This methods validate whether cspace and sspace types are compatible. The types are
// compatible if:
// both are primitive and the cspace type is a subtype of sspace type
// or
// cspace type is an enumeration type whose underlying type is a subtype of sspace type.
// </remarks>
private static bool ValidateScalarTypesAreCompatible(TypeUsage cspaceType, TypeUsage storeType)
{
DebugCheck.NotNull(cspaceType);
DebugCheck.NotNull(storeType);
Debug.Assert(cspaceType.EdmType.DataSpace == DataSpace.CSpace, "cspace property must have a cspace type");
Debug.Assert(storeType.EdmType.DataSpace == DataSpace.CSpace, "storeType type usage must have a sspace type");
Debug.Assert(
IsScalarType(cspaceType.EdmType),
"cspace property must be of a primitive or enumeration type");
Debug.Assert(IsPrimitiveType(storeType.EdmType), "storeType property must be a primitive type");
if (IsEnumType(cspaceType.EdmType))
{
// For enum cspace type check whether its underlying type is a subtype of the store type. Note that
// TypeSemantics.IsSubTypeOf uses only TypeUsage.EdmType for primitive types so there is no need to copy facets
// from the enum type property to the underlying type TypeUsage created here since they wouldn't be used anyways.
return(TypeSemantics.IsSubTypeOf(TypeUsage.Create(GetUnderlyingEdmTypeForEnumType(cspaceType.EdmType)), storeType));
}
return(TypeSemantics.IsSubTypeOf(cspaceType, storeType));
}
private static bool IsPrimitiveTypePromotableTo(TypeUsage fromType, TypeUsage toType)
{
return(TypeSemantics.IsSubTypeOf((PrimitiveType)fromType.EdmType, (PrimitiveType)toType.EdmType));
}