using System;
using System.Collections.Generic;
using System.Text;

namespace Wayne.Lib.StateEngine.Generic
{
    /// <summary>
    /// Generic pseudo state class that has a main object of a generic type.
    /// </summary>
    /// <typeparam name="TMain">Specifies the type of the main object.</typeparam>
    /// <typeparam name="TData">Specifies the type of state data the state uses.</typeparam>
    public abstract class PseudoState<TMain, TData> : PseudoState<TMain> where TData : StateData
    {
        #region Fields

        private IStateWithData dataCompositeState;

        #endregion

        #region Properties

        /// <summary>
        /// Gets the state data for this state.
        /// </summary>
        protected TData Data
        {
            get
            {
                if (dataCompositeState == null)
                {
                    dataCompositeState = StateData.GetParentCompositeStateWithStateData<TData>(this);
                }
                return dataCompositeState.StateData as TData;
            }
        }

        #endregion
    }
}