indicator-catalog

Development

Create and register indicator catalog entries for automation. Use for Catalog.cs files, CatalogListingBuilder patterns, parameter/result definitions, and PopulateCatalog registration.

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Indicator catalog development

File

src/Indicators/{category}/{Indicator}/{Indicator}.Catalog.cs

Builder pattern

public static partial class Ema
{
    /// <summary>
    /// EMA Common Base Listing
    /// </summary>
    internal static readonly IndicatorListing CommonListing =
        new CatalogListingBuilder()
            .WithName("Exponential Moving Average")
            .WithId("EMA")
            .WithCategory(Category.MovingAverage)
            .AddParameter<int>("lookbackPeriods", "Lookback Period",
                description: "Number of periods for the EMA calculation",
                isRequired: true, defaultValue: 20, minimum: 2, maximum: 250)
            .AddResult("Ema", "EMA", ResultType.Default, isReusable: true)
            .Build();

    /// <summary>
    /// EMA Series Listing
    /// </summary>
    internal static readonly IndicatorListing SeriesListing =
        new CatalogListingBuilder(CommonListing)
            .WithStyle(Style.Series)
            .WithMethodName("ToEma")
            .Build();

    /// <summary>
    /// EMA Stream Listing
    /// </summary>
    internal static readonly IndicatorListing StreamListing =
        new CatalogListingBuilder(CommonListing)
            .WithStyle(Style.Stream)
            .WithMethodName("ToEmaHub")
            .Build();

    /// <summary>
    /// EMA Buffer Listing
    /// </summary>
    internal static readonly IndicatorListing BufferListing =
        new CatalogListingBuilder(CommonListing)
            .WithStyle(Style.Buffer)
            .WithMethodName("ToEmaList")
            .Build();
}

Method naming

Style	Pattern	Example
Series	`To{Name}`	`ToEma`
Stream	`To{Name}Hub`	`ToEmaHub`
Buffer	`To{Name}List`	`ToEmaList`

.WithMethodName() must be in style-specific listings, NOT in CommonListing.

Parameter patterns

AddParameter<T>() — primitive value types (typically int or double)
AddEnumParameter<T>() — enum types
AddDateParameter() — DateTime
AddSeriesParameter() — IReadOnlyList<T> where T : IReusable
minimum and maximum required for all numeric parameters

Result patterns

dataName must match property name in Models file exactly
isReusable: true only for the property mapping to IReusable.Value
ISeries models: all results must have isReusable: false
Exactly one isReusable: true per IReusable indicator

Category	Examples
`CandlestickPattern`	Doji, Marubozu
`MovingAverage`	EMA, SMA, HMA, TEMA, WMA, DEMA
`Oscillator`	RSI, Stochastic, MACD, CCI, BOP, CMO, Chop, DPO
`PriceChannel`	Bollinger Bands, Keltner, Donchian, VWAP
`PriceCharacteristic`	ATR, Beta, Standard deviation, True Range
`PricePattern`	Fractal, Pivot Points
`PriceTransform`	Bar Part, ZigZag
`PriceTrend`	ADX, Aroon, Alligator, AtrStop, SuperTrend, Vortex
`StopAndReverse`	Chandelier, Parabolic SAR, Volatility Stop
`VolumeBased`	OBV, Chaikin Money Flow, Chaikin Oscillator

Registration

Add entries inside the host repository's catalog populator method. The backing collection is a private static readonly List<IndicatorListing> declared at the top of the catalog file; the host repository determines its field name (shown below as listings).

Indicators are grouped alphabetically by indicator ID (abbreviation) and separated by a blank line. Each block is preceded by a short comment header — // {Abbreviation} ({Full Name}) when an abbreviation is conventional, otherwise just // {Full Name}. Within a block, the preferred order for the style listings is Buffer → Series → Stream:

// EMA (Exponential Moving Average)
listings.Add(Ema.BufferListing);
listings.Add(Ema.SeriesListing);
listings.Add(Ema.StreamListing);

// HMA (Hull Moving Average)
listings.Add(Hma.BufferListing);
listings.Add(Hma.SeriesListing);
listings.Add(Hma.StreamListing);

Series-only indicators (no streamable variant) register a single SeriesListing line in the same alphabetical position; e.g.:

// Beta
listings.Add(Beta.SeriesListing);

Prohibited

.WithMethodName() in CommonListing
Wrong indicator method name
isReusable: true for ISeries models
Multiple isReusable: true results per indicator

Testing

tests/Library/Indicators/{folder}/{Indicator}/{Indicator}CatalogTests.cs:

[TestClass]
public class EmaCatalogTests : TestBase
{
    [TestMethod]
    public void EmaSeriesListing()
    {
        var listing = Ema.SeriesListing;
        listing.Name.Should().Be("Exponential Moving Average");
        listing.Style.Should().Be(Style.Series);
        listing.MethodName.Should().Be("ToEma");
    }
}