protected virtual ReadOnlyCollection <TaxCode> GetTaxCodes(TaxableItem taxableItem, RequestContext context, SalesTransaction transaction)
{
ThrowIf.Null(taxableItem, "taxableItem");
ThrowIf.Null(context, "context");
try
{
Dictionary <string, TaxCode> codes = new Dictionary <string, TaxCode>();
// If the line has an EndDate specified (usually because it's a Returned line),
// then use that value to calculate taxes, otherwise use BeginDate
TaxDateAndGroups key = new TaxDateAndGroups(this.GetTaxDate(taxableItem), taxableItem.SalesTaxGroupId, taxableItem.ItemTaxGroupId);
ReadOnlyCollection <TaxCodeInterval> taxCodeIntervals = null;
if (key.IsNoTax)
{
taxCodeIntervals = new List <TaxCodeInterval>().AsReadOnly();
}
else if (!this.TaxContext.TaxCodeInternalsLookup.TryGetValue(key, out taxCodeIntervals))
{
// Shouldn't get here.
taxCodeIntervals = this.GetTaxCodeIntervals(context, taxableItem.SalesTaxGroupId, taxableItem.ItemTaxGroupId, key.TaxDate);
}
foreach (TaxCodeInterval taxCodeInterval in taxCodeIntervals)
{
if (codes.ContainsKey(taxCodeInterval.TaxCode))
{
// Add a new 'value' entry for an existing tax code
var taxInterval = new TaxInterval(taxCodeInterval.TaxLimitMinimum, taxCodeInterval.TaxLimitMaximum, taxCodeInterval.TaxValue);
codes[taxCodeInterval.TaxCode].TaxIntervals.Add(taxInterval);
}
else
{
this.AddTaxCode(context, taxableItem, taxCodeInterval, codes, transaction);
}
}
// Link any taxes which rely on other taxes
foreach (TaxCode tax in codes.Values)
{
if (!string.IsNullOrEmpty(tax.TaxOnTax) &&
(tax.TaxBase == TaxBase.PercentPerTax || tax.TaxBase == TaxBase.PercentPerGross) &&
codes.Keys.Contains(tax.TaxOnTax))
{
tax.TaxOnTaxInstance = codes[tax.TaxOnTax];
}
}
return(this.SortCodes(codes));
}
catch (Exception ex)
{
RetailLogger.Log.CrtServicesTaxCodeProviderTaxServiceGetTaxCodesFailure(ex);
throw;
}
}
private void FixTaxCodeIntervalsLookup(RequestContext context, List <TaxableItem> taxableItems)
{
foreach (TaxableItem taxableItem in taxableItems)
{
TaxDateAndGroups key = new TaxDateAndGroups(this.GetTaxDate(taxableItem), taxableItem.SalesTaxGroupId, taxableItem.ItemTaxGroupId);
if (!key.IsNoTax)
{
if (!this.TaxContext.TaxCodeInternalsLookup.ContainsKey(key))
{
this.TaxContext.TaxCodeInternalsLookup.Add(key, this.GetTaxCodeIntervals(context, key.SalesTaxGroup, key.ItemTaxGroup, key.TaxDate));
}
}
}
}
