public ProbabilityObjectCollection(IEnumerable <IProbabilityObject> items)
{
if (items == null)
{
throw new ArgumentNullException(nameof(items));
}
ProbabilityCollection = new ProbabilityCollection <T>(
items.Select(i => new KeyValuePair <T, decimal?>((T)i, i?.Probability)));
}
public ProbabilityObjectCollection(ProbabilityObjectWrapper <T>[] items)
{
if (items == null)
{
throw new ArgumentNullException(nameof(items));
}
ProbabilityCollection = new ProbabilityCollection <T>(
items.Select(i => new KeyValuePair <T, decimal?>(i.Value, i.Probability)));
}
// just wrapper for WeightedRandom method with ProbabilityCollection
public static T ProbabilityRandom <T>(this Randomizer randomizer, ProbabilityCollection <T> probabilities)
{
// need null checks??
if (!probabilities.HasDefinedProbabilities)
{
return(randomizer.ListItem(probabilities.AsList.ToList()));
}
var itemsWithProbs = probabilities.GetItemsWithProbabilities(true).ToArray();
var items = itemsWithProbs.Select(i => i.Key).ToArray();
var weights = itemsWithProbs.Select(i => (float)i.Value).ToArray();
return(randomizer.WeightedRandom(items, weights));
}
public static T ProbabilityRandomIfAny <T>(this Randomizer randomizer, ProbabilityCollection <T> probabilities)
{
if (probabilities.IsNullOrEmpty())
{
return(default);
