WolseyExtendedClassification.cs

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namespace LotSizingDataModel.Instance.Historical.Wolsey;
 
/// <summary>
/// Preserves Wolsey's optional multi-item/machine/level extension around the
/// single-item PROB-CAP-VAR classification.
/// </summary>
public sealed class WolseyExtendedClassification
{
    public WolseyExtendedClassification(
        WolseySingleItemClassification singleItem,
        int? itemCount = null,
        int? periodCount = null,
        WolseyMachineClassification? machines = null,
        WolseyMultiLevelClassification? multiLevel = null)
    {
        SingleItem =
            singleItem ??
            throw new ArgumentNullException(nameof(singleItem));
 
        if (itemCount is <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(itemCount),
                itemCount,
                "NI must be positive when supplied.");
        }
 
        if (periodCount is <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(periodCount),
                periodCount,
                "NT must be positive when supplied.");
        }
 
        ItemCount = itemCount;
        PeriodCount = periodCount;
        Machines = machines;
        MultiLevel = multiLevel;
    }
 
    public WolseySingleItemClassification SingleItem { get; }
    public int? ItemCount { get; }
    public int? PeriodCount { get; }
    public WolseyMachineClassification? Machines { get; }
    public WolseyMultiLevelClassification? MultiLevel { get; }
 
    public string HistoricalCode
    {
        get
        {
            var blocks = new List<string>();
 
            if (MultiLevel is not null)
            {
                blocks.Add(MultiLevel.HistoricalCode);
            }
 
            if (Machines is not null)
            {
                blocks.Add(Machines.HistoricalCode);
            }
 
            if (ItemCount.HasValue)
            {
                blocks.Add($"{{NI={ItemCount.Value}}}");
            }
 
            if (PeriodCount.HasValue)
            {
                blocks.Add($"{{NT={PeriodCount.Value}}}");
            }
 
            blocks.Add(
                "{" +
                SingleItem.HistoricalCode +
                "}");
 
            return string.Concat(blocks);
        }
    }
 
    public override string ToString() =>
        HistoricalCode;
}