/// <summary>
/// Gets a list of <see cref="CelestialObject"/> for a <see cref="CelestialObjectType.Planet"/>
/// </summary>
/// <param name="solarSystemObject">Parse a <see cref="CelestialObject"/> of type <see cref="CelestialObjectType.Planet"/></param>
/// <param name="includeMinorMoons">If true <see cref="CelestialObjectType.MinorMoon"/> are included.</param>
/// <returns></returns>
/// <exception cref="ArgumentException">If <see cref="solarSystemObject"/> is not of type <see cref="CelestialObjectType.Planet"/>.</exception>
private static IEnumerable <CelestialObject> GetMoons(this CelestialObject solarSystemObject, bool includeMinorMoons)
{
if (solarSystemObject.GetSolarSystemObjectType() != CelestialObjectType.Planet)
{
throw new ArgumentException($"{solarSystemObject} is not of type {CelestialObjectType.Planet}.", nameof(solarSystemObject));
}
var solarSolarSystemObjectTypes = new List <CelestialObjectType> {
CelestialObjectType.MajorMoon
};
if (includeMinorMoons)
{
solarSolarSystemObjectTypes.Add(CelestialObjectType.MinorMoon);
}
bool Expression(CelestialObject x) =>
x > solarSystemObject &&
x < solarSystemObject + (int)CelestialObjectType.Planet &&
x.GetSolarSystemObjectType().In(solarSolarSystemObjectTypes.ToArray());
return(EnumHelper.GetValues((Func <CelestialObject, bool>)Expression));
}
