/// <summary>
/// Declare the extension method given the function container class.
/// </summary>
/// <param name="functionExtensionClass">Function container class</param>
/// <param name="func">Function to add</param>
protected virtual void DeclareExtensionMethod(CodeTypeDeclaration functionExtensionClass, Function func)
{
// retrieve parameters and add the extension method
ServiceOperationAnnotation actionAnnotation = func.Annotations.OfType <ServiceOperationAnnotation>().Single();
ExceptionUtilities.Assert(actionAnnotation.BindingKind.IsBound(), "Action function cannot generate extension method with out function having a binding");
FunctionParameter bindingTypeParameter = func.Parameters[0];
CodeMemberMethod method = functionExtensionClass.AddExtensionMethod(
func.Name,
new CodeParameterDeclarationExpression(
this.GetParameterTypeOrFunctionReturnTypeReference(bindingTypeParameter.Annotations, bindingTypeParameter.DataType),
bindingTypeParameter.Name));
// add non-binding type parameters
foreach (var parameter in func.Parameters.Where(p => p.Name != bindingTypeParameter.Name))
{
method.Parameters.Add(
new CodeParameterDeclarationExpression(
this.GetParameterTypeOrFunctionReturnTypeReference(parameter.Annotations, parameter.DataType),
parameter.Name));
}
// throw exception if the client code method is called
method.Statements.Add(
new CodeThrowExceptionStatement(
new CodeObjectCreateExpression(
new CodeTypeReference(typeof(InvalidOperationException)),
new CodeExpression[] { })));
// add method return type
if (func.ReturnType != null)
{
method.ReturnType = this.GetParameterTypeOrFunctionReturnTypeReference(func.Annotations, func.ReturnType);
}
}