public bool TryGetHandler(Type inputType, out ResponseTypeHandler <TContext, TRequest, TResponse> handler)
{
lock (this) {
if (Distances.TryGetValue(inputType, out var dict) == true)
{
var handleAsType = dict.OrderByDescending(pair => pair.Value).Select(pair => pair.Key);
if (handleAsType == null || handleAsType.Any() == false)
{
throw new UnhandledResponseTypeException(inputType);
}
if (Collection.TryGetValue(handleAsType.First(), out handler) == false)
{
throw new UnhandledResponseTypeException(inputType);
}
return(true);
}
else
{
dict = new Dictionary <Type, int>();
Distances.Add(inputType, dict);
Tuple <int, Type> closest = null;
foreach (var targetType in Collection.Keys)
{
var dist = inputType.DistanceToType(targetType);
if (dist >= 0)
{
dict.Add(targetType, dist);
if (closest == null || closest.Item1 > dist)
{
closest = Tuple.Create(dist, targetType);
}
}
}
if (closest != null)
{
handler = Collection[closest.Item2];
return(true);
}
handler = null;
return(false);
}
}
}
public void Add(Type type, ResponseTypeHandler <TContext, TRequest, TResponse> handler)
{
lock (this) {
Collection[type] = handler;
foreach (var pair in Distances)
{
if (pair.Value.ContainsKey(type) == false)
{
var dist = pair.Key.DistanceToType(type);
if (dist >= 0)
{
pair.Value.Add(type, dist);
}
}
}
}
}
