/// <summary>
/// The get taxation by product method.
/// </summary>
/// <returns>
/// The <see cref="ITaxationByProductMethod"/>.
/// </returns>
/// <exception cref="NullReferenceException">
/// Throws a null reference exception if a provider cannot be resolved
/// </exception>
private ITaxationByProductMethod GetTaxationByProductMethod()
{
var taxMethod = GatewayProviderService.GetTaxMethodForProductPricing();
if (taxMethod == null)
{
LogHelper.Debug <TaxationContext>("Product based pricing is set in settings, but a TaxMethod has not been assigned.");
this._taxMethodNotQueried = true;
return(null);
}
var provider = GatewayProviderResolver.GetProviderByKey <TaxationGatewayProviderBase>(taxMethod.ProviderKey);
if (provider == null)
{
var error = new NullReferenceException("Could not reTaxationGatewayProvider for CalculateTaxForProduct could not be resolved");
LogHelper.Error <TaxationContext>("Resolution failure", error);
throw error;
}
var productProvider = provider as ITaxationByProductProvider;
if (productProvider != null)
{
this._taxMethodNotQueried = false;
return(productProvider.GetTaxationByProductMethod(taxMethod.Key));
}
LogHelper.Debug <TaxationContext>("Resolved provider did not Implement ITaxationByProductProvider returning no tax");
return(null);
}
