/// <summary>
/// Reads an annotation's value from the annotation value notation specified on the current element.
/// </summary>
/// <param name="expectedTypeReference">The expected type reference of the vocabulary term from the metadata.</param>
/// <param name="attributeValueNotationTypeReference">The type reference indicated by the name of the attribute used in attribute value notation.
/// For example, if the attribute was called "string", this will be a reference to the string type.</param>
/// <param name="attributeValueNotationAttributeName">The name of the attribute used by attribute avalue notation.</param>
/// <param name="attributeValueNotationAttributeValue">The value of the attribute used by attribute value notation.</param>
/// <param name="typeAttributeValue">The value of the "m:type" attribute on the annotation element.</param>
/// <param name="positionedOnEmptyElement">true if the annotation element is empty, false otherwise.</param>
/// <param name="model">The edm model instance.</param>
/// <param name="messageReaderSettings">The message reader settings instance.</param>
/// <param name="version">The payload version to read.</param>
/// <returns>The primitive value represented on this element via attribute value notation.</returns>
private static ODataPrimitiveValue GetValueFromAttributeValueNotation(
IEdmTypeReference expectedTypeReference,
IEdmPrimitiveTypeReference attributeValueNotationTypeReference,
string attributeValueNotationAttributeName,
string attributeValueNotationAttributeValue,
string typeAttributeValue,
bool positionedOnEmptyElement,
IEdmModel model,
ODataMessageReaderSettings messageReaderSettings,
ODataVersion version)
{
Debug.Assert(attributeValueNotationTypeReference != null, "attributeValueNotationTypeReference != null");
if (!positionedOnEmptyElement)
{
// If there is content in the body of the element, throw since it's ambiguous whether we should use the value from the attribute or the element content.
throw new ODataException(ODataErrorStrings.AtomInstanceAnnotation_AttributeValueNotationUsedOnNonEmptyElement(attributeValueNotationAttributeName));
}
// If both m:type is present and attribute value notation is being used, they must match.
// For example, if m:type is "Edm.Int32", but the "string" attribute is also present, we should throw.
if (typeAttributeValue != null && !string.Equals(attributeValueNotationTypeReference.Definition.ODataFullName(), typeAttributeValue, StringComparison.Ordinal))
{
throw new ODataException(ODataErrorStrings.AtomInstanceAnnotation_AttributeValueNotationUsedWithIncompatibleType(typeAttributeValue, attributeValueNotationAttributeName));
}
IEdmTypeReference targetTypeReference = ReaderValidationUtils.ResolveAndValidatePrimitiveTargetType(
expectedTypeReference,
EdmTypeKind.Primitive,
attributeValueNotationTypeReference.Definition,
attributeValueNotationTypeReference.ODataFullName(),
attributeValueNotationTypeReference.Definition,
model,
messageReaderSettings,
version);
return(new ODataPrimitiveValue(AtomValueUtils.ConvertStringToPrimitive(attributeValueNotationAttributeValue, targetTypeReference.AsPrimitive())));
}