FsmBuilderException.cs

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using System;

namespace StateMachine
{
    public class FsmBuilderException : Exception
    {
        private FsmBuilderException(string message) : base(message)
        {
        }

        public static FsmBuilderException StateCanOnlyBeAddedOnce<TS, TT>(
            State<TS, TT> state)
            => new FsmBuilderException($"A state [{state.Identifier}] has already been added. You can only one add" +
                                       " a state with a unique identifier once.");

        public static FsmBuilderException TargetStateCannotBeNull()
            => new FsmBuilderException("The target of a transition cannot be null.");

        public static FsmBuilderException TransitionCannotBeNull()
            => new FsmBuilderException("The transition cannot be null.");

        public static FsmBuilderException StateCannotBeNull() => new FsmBuilderException("The state cannot be null.");

        public static FsmBuilderException StartStateCannotBeNull()
            => new FsmBuilderException("The start state cannot be null.");

        public static FsmBuilderException ModelCannotBeNull() => new FsmBuilderException("The model cannot be null.");

        public static FsmBuilderException TriggerAlreadyDeclared<TT>(TT trigger)
            => new FsmBuilderException($"The transition already contains the trigger [{trigger}]");

        public static FsmBuilderException HandlerCannotBeNull()
            => new FsmBuilderException("The handler you want to add cannot be null.");
    }
}