/// <summary>
/// Appends the key expression for the given entity to the given <see cref="StringBuilder"/>
/// </summary>
/// <param name="entity">The entity to build the key expression from.</param>
/// <param name="builder">The builder to append onto.</param>
internal void AppendKeyExpression(IEdmStructuredValue entity, StringBuilder builder)
{
Debug.Assert(entity != null, "entity != null");
Debug.Assert(builder != null, "builder != null");
IEdmEntityTypeReference edmEntityTypeReference = entity.Type as IEdmEntityTypeReference;
if (edmEntityTypeReference == null || !edmEntityTypeReference.Key().Any())
{
throw Error.Argument(ErrorStrings.Content_EntityWithoutKey, "entity");
}
this.AppendKeyExpression(edmEntityTypeReference.Key().ToList(), p => p.Name, p => GetPropertyValue(entity.FindPropertyValue(p.Name), entity.Type), builder);
}
/// <summary>
/// Appends the key expression for the given entity to the given <see cref="StringBuilder"/>
/// </summary>
/// <typeparam name="T">The type of the properties.</typeparam>
/// <param name="keyProperties">The properties of the key.</param>
/// <param name="getPropertyName">Delegate to get the name of a property.</param>
/// <param name="getValueForProperty">Delegate to get the value of a property.</param>
/// <param name="builder">The builder to append onto.</param>
internal void AppendKeyExpression <T>(ICollection <T> keyProperties, Func <T, string> getPropertyName, Func <T, object> getValueForProperty, StringBuilder builder)
{
Func <T, object> getValueForPropertyWithNullCheck = p =>
{
Debug.Assert(getValueForProperty != null, "getValueForProperty != null");
object propertyValue = getValueForProperty(p);
if (propertyValue == null)
{
throw Error.InvalidOperation(Client.Strings.Context_NullKeysAreNotSupported(getPropertyName(p)));
}
return(propertyValue);
};
this.keySerializer.AppendKeyExpression(builder, keyProperties, getPropertyName, getValueForPropertyWithNullCheck);
}
/// <summary>
/// Gets the raw CLR value for the given <see cref="IEdmPropertyValue"/>.
/// </summary>
/// <param name="property">The property to get the value for.</param>
/// <param name="type">The type which declared the property.</param>
/// <returns>The raw CLR value of the property.</returns>
private static object GetPropertyValue(IEdmPropertyValue property, IEdmTypeReference type)
{
Debug.Assert(property != null, "property != null");
IEdmValue propertyValue = property.Value;
// DEVNOTE: though this check is not strictly necessary, and would be caught by later checks,
// it seems worthwhile to fail fast if we can.
if (propertyValue.ValueKind == EdmValueKind.Null)
{
throw Error.InvalidOperation(ErrorStrings.Context_NullKeysAreNotSupported(property.Name));
}
var primitiveValue = propertyValue as IEdmPrimitiveValue;
if (primitiveValue == null)
{
throw Error.InvalidOperation(ErrorStrings.ClientType_KeysMustBeSimpleTypes(type.FullName()));
}
// DEVNOTE: This can return null, and will be handled later. The reason for this is that the client
// and server have different ways of getting property values, but both will eventually hit the same
// codepath and that is where the null is handled.
return(primitiveValue.ToClrValue());
}