/// <summary>
/// Gets the states.
/// </summary>
/// <param name="configuration">The configuration.</param>
/// <returns></returns>
/// <exception cref="Exception">
/// Type '" + item.StateBehaviorClass + "' not found.
/// or
/// Type '" + item.StateBehaviorClass + "' is not IStateBehavior<" + typeof(FlowState).Name + ">.
/// </exception>
private static List <FlowState> GetStates(LuisConfiguration configuration)
{
int i = 1;
var states = new List <FlowState>();
foreach (var item in configuration.LuisFlowStates)
{
var state = new FlowState
{
Id = i++,
Name = item.Name,
IsInitialState = item.IsInitialState
};
if (item.StateBehaviorClass != null)
{
Type type = Type.GetType(item.StateBehaviorClass);
if (type == null)
{
throw new Exception("Type '" + item.StateBehaviorClass + "' not found.");
}
var isImplementing = type.GetInterfaces().Contains(typeof(IStateBehavior));
if (!isImplementing)
{
throw new Exception("Type '" + item.StateBehaviorClass + "' is not IStateBehavior.");
}
state.BehaviorType = type;
}
states.Add(state);
}
return(states);
}
/// <summary>
/// Converts the specified configuration.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="configuration">The configuration.</param>
/// <returns></returns>
public static LuisFlowConfiguration <FlowState> Convert(LuisConfiguration configuration)
{
LuisFlowConfiguration <FlowState> config = new LuisFlowConfiguration <FlowState>();
config.States = GetStates(configuration);
var count = config.States.Count(x => x.IsInitialState);
if (count == 0)
{
throw new Exception("An initial state is required.");
}
else if (count > 1)
{
throw new Exception("Only one initial state is needed.");
}
config.Transitions = GetTransitions(config.States, configuration);
return(config);
}
/// <summary>
/// Gets the transitions.
/// </summary>
/// <param name="flowStates">The flow states.</param>
/// <param name="configuration">The configuration.</param>
/// <returns></returns>
/// <exception cref="Exception">
/// </exception>
private static List <StateTransition <FlowState, string, LanguageUnderstandingResult> > GetTransitions(IEnumerable <FlowState> flowStates, LuisConfiguration configuration)
{
var transitions = new List <StateTransition <FlowState, string, LanguageUnderstandingResult> >();
foreach (var luisFlowStateTransition in configuration.LuisFlowStateTransitions)
{
CognitiveServices.LanguageUnderstanding.Conditions.IConditionOperator <LanguageUnderstandingResult> op = null;
if (luisFlowStateTransition.Condition != null)
{
var inputAndOperator = luisFlowStateTransition.Condition.AndOperator;
if (inputAndOperator != null)
{
op = ProcessAndOperator(inputAndOperator);
}
var inputOrOperator = luisFlowStateTransition.Condition.OrOperator;
if (inputOrOperator != null)
{
op = ProcessOrOperator(inputOrOperator);
}
var entityEquals = luisFlowStateTransition.Condition.IsEntityEquals;
if (entityEquals != null)
{
op = ProcessIsEntityEqualsOperator(entityEquals);
}
}
var currentState = flowStates.FirstOrDefault(x => x.Name == luisFlowStateTransition.CurrentState.Name);
if (currentState == null)
{
throw new Exception($"Current state '{luisFlowStateTransition.CurrentState}' is not defined among the states.");
}
var nextState = flowStates.FirstOrDefault(x => x.Name == luisFlowStateTransition.NextState.Name);
if (nextState == null)
{
throw new Exception($"Next state '{luisFlowStateTransition.CurrentState}' is not defined among the states.");
}
var transition = new LuisFlowStateTransition <FlowState>(currentState, nextState, luisFlowStateTransition.Intent, luisFlowStateTransition.IsFinalState, op);
transitions.Add(transition);
}
return(transitions);
}
