using System;

namespace Caliburn.Events
{
    public class GenericEventHandler<T, K, U, V> : IEventHandler
    {
        private Action<object[]> _action;

        #region IEventHandler Members

        public void SetAction(Action<object[]> action)
        {
            _action = action;
        }

        public void Execute(params object[] invokeArgs)
        {
            if(_action != null)
                _action(invokeArgs);
            else throw new CaliburnException("The invoker does not have a valid Action.");
        }

        #endregion

        public void Invoke()
        {
            Execute();
        }

        public void Invoke(T argT)
        {
            Execute(argT);
        }

        public void Invoke(T argT, K argK)
        {
            Execute(argT, argK);
        }

        public void Invoke(T argT, K argK, U argU)
        {
            Execute(argT, argK, argU);
        }

        public void Invoke(T argT, K argK, U argU, V argV)
        {
            Execute(argT, argK, argU, argV);
        }
    }
}