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The following calculation services are available to calculate order totals in different levels.
When you create an order (cart, purchase order, or payment plan) through the IOrderRepository, a shipment is created. Order calculators calculate only line items that belong to a shipment. This is a changed behavior from the way it worked with workflow activities.
The IOrderGroupTotalsCalculator makes calculations for the IOrderGroup, it's IOrderForms, IShipments, and ILineItems.
The method calls all calculators to calculate the values.
public void GetTotals(IOrderGroup orderGroup, IOrderGroupTotalsCalculator calculator)
{
var calculatedTotals = calculator.GetTotals(orderGroup);
Debug.WriteLine("Handling total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, calculatedTotals.HandlingTotal);
Debug.WriteLine("Shipping total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, calculatedTotals.ShippingTotal);
Debug.WriteLine("Sub total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, calculatedTotals.SubTotal);
Debug.WriteLine("Tax total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, calculatedTotals.TaxTotal);
Debug.WriteLine("Total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, calculatedTotals.Total);
foreach (var form in orderGroup.Forms)
{
var orderFormTotals = calculatedTotals[form];
Debug.WriteLine("Handling total for order form '{0}': {1}", form.OrderFormId, orderFormTotals.HandlingTotal);
Debug.WriteLine("Shipping total for order form '{0}': {1}", form.OrderFormId, orderFormTotals.ShippingTotal);
Debug.WriteLine("Sub total for order form '{0}': {1}", form.OrderFormId, orderFormTotals.SubTotal);
Debug.WriteLine("Tax total for order form '{0}': {1}", form.OrderFormId, orderFormTotals.TaxTotal);
Debug.WriteLine("Total for order form '{0}': {1}", form.OrderFormId, orderFormTotals.Total);
foreach (var shipment in form.Shipments)
{
var shipmentTotals = orderFormTotals[shipment];
Debug.WriteLine("Shipping cost for shipment '{0}': {1}", shipment.ShipmentId, shipmentTotals.ShippingCost);
Debug.WriteLine("Items total for shipment '{0}': {1}", shipment.ShipmentId, shipmentTotals.ItemsTotal);
foreach (var item in shipment.LineItems)
{
Debug.WriteLine("Extended price for '{0}': {1}", item.Code, shipmentTotals[item]);
}
}
}
}The ILineItemCalculator calculates a line item's extended price and discounted price.
public void GetExtendedPrice(ILineItem lineItem, ILineItemCalculator lineItemCalculator)
{
var extendedPrice = lineItemCalculator.GetExtendedPrice(lineItem, Currency.USD);
Debug.WriteLine("Extended price for '{0}': {1}", lineItem.Code, extendedPrice);
}
public void GetDiscountedPrice(ILineItem lineItem, ILineItemCalculator lineItemCalculator)
{
var extendedPrice = lineItemCalculator.GetDiscountedPrice(lineItem, Currency.USD);
Debug.WriteLine("Discounted price for '{0}': {1}", lineItem.Code, extendedPrice);
}By inheriting from the default implementation of the interface, DefaultLineItemCalculator, you can override the extended price calculation. Just override the CalculateExtendedPrice method.
public class LineItemCalculatorSample : DefaultLineItemCalculator
{
protected override Money GetExtendedPrice(ILineItem lineItem, Currency currency)
{
throw new NotImplementedException();
}
protected override Money GetDiscountedPrice(ILineItem lineItem, Currency currency)
{
throw new NotImplementedException();
}
}
The default implementation validates that the extended price is not negative after the calculation. To change the behavior, override the ValidateExtendedPrice method.
public class LineItemCalculatorSample : DefaultLineItemCalculator
{
protected override void ValidateExtendedPrice(Money money)
{
if (money.Amount <= 0)
{
throw new ValidationException("Extended price must be greater than 0");
}
}
}The IShippingCalculator calculates the shipping cost of an order, order form, and shipment. It also calculates the total amount of line items in the shipment.
public void GetShippingCost(IOrderGroup orderGroup, IShippingCalculator shipmentCalculator, ICurrentMarket currentMarket)
{
var shipmentCost = shipmentCalculator.GetShippingCost(orderGroup, currentMarket.GetCurrentMarket(), Currency.USD);
Debug.WriteLine("Shipping cost for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, shipmentCost);
}
public void GetShippingCost(IOrderForm orderForm, IShippingCalculator shipmentCalculator, ICurrentMarket currentMarket)
{
var shipmentCost = shipmentCalculator.GetShippingCost(orderForm, currentMarket.GetCurrentMarket(), Currency.USD);
Debug.WriteLine("Shipping cost for order form '{0}': {1}", orderForm.OrderFormId, shipmentCost);
}
public void GetShippingCost(IShipment shipment, IShippingCalculator shipmentCalculator, ICurrentMarket currentMarket)
{
var shipmentCost = shipmentCalculator.GetShippingCost(shipment, currentMarket.GetCurrentMarket(), Currency.USD);
Debug.WriteLine("Shipping cost for shipment '{0}': {1}", shipment.ShipmentId, shipmentCost);
}
public void GetShippingItemsTotal(IShipment shipment, IShippingCalculator shipmentCalculator)
{
var shippingItemsTotal = shipmentCalculator.GetShippingItemsTotal(shipment, Currency.USD);
Debug.WriteLine("Shipping items total for '{0}': {1}", shipment.ShipmentId, shippingItemsTotal);
}By inheriting from the default implementation of the interface, DefaultShippingCalculator, you can override the shipping cost calculation. To change that calculation, override one or several of the CalculateShippingCost methods. To change the calculation of shipping items' total, override the CalculateShippingItemsTotal method.
public class ShippingCalculatorSample : DefaultShippingCalculator
{
private readonly ILineItemCalculator _lineItemCalculator;
public ShippingCalculatorSample(ILineItemCalculator lineItemCalculator)
: base(lineItemCalculator)
{
_lineItemCalculator = lineItemCalculator;
}
protected override Money CalculateShippingCost(IOrderGroup orderGroup, IMarket market, Currency currency)
{
//iterate over all order forms in this order group and sum the results.
var shippingTotal = orderGroup.Forms
.Sum(form => GetShippingCost(form, market, currency).Amount);
return new Money(shippingTotal, currency);
}
protected override Money CalculateShippingCost(IOrderForm orderForm, IMarket market, Currency currency)
{
//iterate over all shipments in this order form and sum the results.
var result = orderForm.Shipments
.Sum(shipment => GetShippingCost(shipment, market, currency).Amount - shipment.ShippingDiscountAmount);
return new Money(result, currency);
}
protected override Money CalculateShipmentCost(IShipment shipment, IMarket market, Currency currency)
{
//find the shipping method assigned to the shipment
var shippingMethods = ShippingManager.GetShippingMethods(String.Empty);
var row = shippingMethods.ShippingMethod.FindByShippingMethodId(shipment.ShippingMethodId);
//get the instance of the shipping provider.
var type = Type.GetType(row.ShippingOptionRow.ClassName);
var provider = (IShippingGateway)Activator.CreateInstance(type, market);
//get the rate for this shipment
var message = String.Empty;
var rate = provider.GetRate(row.ShippingMethodId, shipment as Shipment, ref message);
//convert result to correct currency and return.
return rate != null ?
CurrencyFormatter.ConvertCurrency(rate.Money, currency) :
new Money(0, currency);
}
protected override Money CalculateShippingItemsTotal(IShipment shipment, Currency currency)
{
//calculate the total price of all line items
var result = 0m;
foreach (var lineItem in shipment.LineItems.Where(x => x.Quantity > 0))
{
var extemdedPrice = _lineItemCalculator.GetExtendedPrice(lineItem, currency);
result += extemdedPrice.Amount;
}
return new Money(result, currency);
}
}The default implementation validates that the shipment cost is not negative after the calculation. To change the behavior, override the method ValidateShipmentCostForOrder, ValidateShipmentCostForOrderForm, ValidateShipmentCostForShipment, or ValidateShippingItemTotal, depending on which validation you should override.
public class ShippingCalculatorSample : DefaultShippingCalculator
{
private readonly ILineItemCalculator _lineItemCalculator;
public ShippingCalculatorSample(ILineItemCalculator lineItemCalculator)
: base(lineItemCalculator)
{
_lineItemCalculator = lineItemCalculator;
}
protected override void ValidateShipmentCostForOrder(Money money)
{
if (money.Amount <= 0)
{
throw new ValidationException("Shipment cost must be greater than 0");
}
}
protected override void ValidateShipmentCostForOrderForm(Money money)
{
if (money.Amount <= 0)
{
throw new ValidationException("Shipment cost must be greater than 0");
}
}
protected override void ValidateShipmentCostForShipment(Money money)
{
if (money.Amount <= 0)
{
throw new ValidationException("Shipment cost must be greater than 0");
}
}
protected override void ValidateShippingItemTotal(Money money)
{
if (money.Amount <= 0)
{
throw new ValidationException("Shipping item total must be greater than 0");
}
}
}The ITaxCalculator calculates the tax cost for the shipment, order, and order form.
public void GetTaxTotal(IOrderGroup orderGroup, ITaxCalculator taxCalculator, ICurrentMarket currentMarket)
{
var taxTotal = taxCalculator.GetTaxTotal(orderGroup, currentMarket.GetCurrentMarket(), Currency.USD);
Debug.WriteLine("Tax total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, taxTotal);
}
public void GetTaxTotal(IOrderForm orderForm, ITaxCalculator taxCalculator, ICurrentMarket currentMarket)
{
var taxTotal = taxCalculator.GetTaxTotal(orderForm, currentMarket.GetCurrentMarket(), Currency.USD);
Debug.WriteLine("Tax total for order form '{0}': {1}", orderForm.OrderFormId, taxTotal);
}By inheriting from the default implementation of the interface, DefaultTaxCalculator, you can override the calculation of tax total. Just override one or several of the CalculateTaxTotal methods.
public class TaxCalculatorOverridingDefault : DefaultTaxCalculator
{
public TaxCalculatorOverridingDefault(IContentRepository contentRepository,
ReferenceConverter referenceConverter,
IShippingCalculator shippingCalculator)
: base(contentRepository, referenceConverter, shippingCalculator)
{
}
//override this to implement custom tax retrieval
protected override IEnumerable GetTaxValues(string taxCategory, string languageCode, IOrderAddress orderAddress)
{
return new[] { new TaxValue() };
}
//override this to implement custom tax calculation for a shipment
protected override decimal CalculateTax(IEnumerable taxes, IShipment shipment, IMarket market, Currency currency)
{
return 0;
}
}The default implementation validates that the tax is not negative after the calculation. To change the behavior, override the ValidateTaxTotalForOrder method or the ValidateTaxTotalForOrderForm method, depending on which validation you should override.
public class TaxCalculatorOverridingDefault : DefaultTaxCalculator
{
public TaxCalculatorOverridingDefault(IContentRepository contentRepository,
ReferenceConverter referenceConverter,
IShippingCalculator shippingCalculator)
: base(contentRepository, referenceConverter, shippingCalculator)
{
}
protected override void ValidateTaxTotalForOrder(Money money)
{
if (money.Amount <= 0)
{
throw new ValidationException("Shipping item total must be greater than 0");
}
}
protected override void ValidateTaxTotalForOrderForm(Money money)
{
if (money.Amount <= 0)
{
throw new ValidationException("Shipping item total must be greater than 0");
}
}
}The IOrderFormCalculator calculates the handling total, sub total, and total for an order form.
public void GetOrderGroupTotals(IOrderForm orderForm, IOrderFormCalculator orderFormCalculator, ICurrentMarket currentMarket)
{
var handlingTotal = orderFormCalculator.GetHandlingTotal(orderForm, Currency.USD);
var subTotal = orderFormCalculator.GetSubTotal(orderForm, Currency.USD);
var total = orderFormCalculator.GetTotal(orderForm, currentMarket.GetCurrentMarket(), Currency.USD);
Debug.WriteLine("Handling total for order form '{0}': {1}", orderForm.OrderFormId, handlingTotal);
Debug.WriteLine("Sub total for order form '{0}': {1}", orderForm.OrderFormId, subTotal);
Debug.WriteLine("Total for order form '{0}': {1}", orderForm.OrderFormId, total);
}By inheriting from the default implementation of the interface, DefaultOrderFormCalculator, you can override the calculations. Just override one or several of the CalculateHandlingTotal, CalculateSubtotal, or CalculateTotal methods.
The default implementation validates that the total is not negative after the calculation. To change the behavior, override the ValidateHandlingTotal, ValidateSubtotal, or ValidateTotal method, depending on which validation you should override.
The IOrderGroupCalculator calculates an order's handling total, sub total, and total.
public void GetOrderGroupTotals(IOrderGroup orderGroup, IOrderGroupCalculator orderGroupCalculator, ICurrentMarket currentMarket)
{
var handlingTotal = orderGroupCalculator.GetHandlingTotal(orderGroup, Currency.USD);
var subTotal = orderGroupCalculator.GetSubTotal(orderGroup, Currency.USD);
var total = orderGroupCalculator.GetTotal(orderGroup, currentMarket.GetCurrentMarket(), Currency.USD);
Debug.WriteLine("Handling total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, handlingTotal);
Debug.WriteLine("Sub total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, subTotal);
Debug.WriteLine("Total for order '{0}': {1}", orderGroup.OrderLink.OrderGroupId, total);
}By inheriting from the default implementation of the interface, DefaultOrderGroupCalculator, you override the calculations. Just override one or several of the CalculateHandlingTotal, CalculateSubtotal, or CalculateTotal methods.
The default implementation validates that the total is not negative after the calculation. To change the behavior, override the ValidateHandlingTotal, ValidateSubtotal, or ValidateTotal method, depending on which validation you should override.
Last updated: Oct 12, 2015