internal BotState Build()
{
// WARNING: taming of reflection dragons ahead
var botState = default(BotState);
if (_botStateFactory == null)
{
if (_storage == null)
{
throw new InvalidOperationException($"No {nameof(IStorage)} implementation has been specified. Either specify one using {nameof(UseStorage)}, or supply a custom {nameof(BotState)} factory with {nameof(UseBotStateFactory)}.");
}
botState = (BotState)Activator.CreateInstance(typeof(TBotState), _storage);
}
else
{
botState = _botStateFactory.Invoke();
if (botState == default(BotState))
{
throw new InvalidOperationException($"The specified bot state factory returned a null {nameof(BotState)} instance.");
}
}
// TODO: should be an overload of CreateProperty that takes Type!
var createPropertyGenericMethodInfo = typeof(BotState).GetMethod("CreateProperty").GetGenericMethodDefinition();
var statePropertyAccessorGenericInterface = typeof(IStatePropertyAccessor <>);
var services = _botStateConfigurationBuilder.Services;
foreach (var entry in _properties)
{
var createPropertyMethodInfo = createPropertyGenericMethodInfo.MakeGenericMethod(entry.Value);
var propertyAccessor = createPropertyMethodInfo.Invoke(botState, new[] { entry.Key });
services.AddSingleton(statePropertyAccessorGenericInterface.MakeGenericType(entry.Value), propertyAccessor);
}
_botStateConfigurationBuilder.UseBotState(botState);
return(botState);
}
private static BotStateConfigurationBuilder UseBotState <TBotState>(BotStateConfigurationBuilder builder, Action <BotStateBuilder <TBotState> > configure)
where TBotState : BotState
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
if (configure == null)
{
throw new ArgumentNullException(nameof(configure));
}
var stateBuilder = new BotStateBuilder <TBotState>(builder);
configure(stateBuilder);
var botState = stateBuilder.Build();
return(builder.UseBotState(botState));
}