#region  --------------- Copyright Dresser Wayne Pignone -------------
/*
 * $Log: /Wrk/WayneLibraries/Wrk/StateEngine/Description/EventDescriptionAttribute.cs $
 * 
 * 2     08-02-26 14:13 Mattias.larsson
 * Not "sealed" anymore.
 */
#endregion

using System;
namespace Wayne.Lib.StateEngine
{
    /// <summary>
    /// Describe the event / transition relationship for a state class.
    /// </summary>
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
    public class EventDescriptionAttribute : EnterDescriptionAttribute
    {
        #region Fields

        object eventType;

        #endregion

        #region Construction

        /// <summary>
        /// Describe an unconditional event / transition relationship for a state class.
        /// </summary>
        /// <param name="eventType">Event type object</param>
        /// <param name="transitionType">Transition that is performed.</param>
        public EventDescriptionAttribute(object eventType, object transitionType)
            : this(eventType, "", transitionType)
        {
            this.eventType = eventType;
        }
        /// <summary>
        /// Describe the event / transition relationship for a state class.
        /// </summary>
        /// <param name="eventType">Event type object</param>
        /// <param name="conditionText">A descriptive text for the condition.</param>
        /// <param name="transitionType">Transition that is performed.</param>
        public EventDescriptionAttribute(object eventType, string conditionText, object transitionType)
            : base(conditionText, transitionType)
        {
            this.eventType = eventType;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Event type object.
        /// </summary>
        public object EventType
        {
            get { return eventType; }
        }

        #endregion

        #region IComparable Members

        /// <summary>
        /// Compares this attribute with another one.
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public override int CompareTo(object obj)
        {
            int result = 0;
            EventDescriptionAttribute compareEventDescriptionAttribute = obj as EventDescriptionAttribute;
            if (compareEventDescriptionAttribute != null)
            {
                if ((EventType != null) && (compareEventDescriptionAttribute.EventType != null))
                {
                    //result = EventType.GetType().FullName.CompareTo(compareEventDescriptionAttribute.EventType.GetType().FullName);
                    //if (result == 0)
                    {
                        result = EventType.ToString().CompareTo(compareEventDescriptionAttribute.EventType.ToString());
                        if (result == 0)
                            result = base.CompareTo(obj);
                    }
                }
                else if (EventType != null)
                    result = 1;
                else if (compareEventDescriptionAttribute.EventType != null)
                    result = -1;
            }
            else
            {
                EnterDescriptionAttribute compareEnterDescriptionAttribute = obj as EnterDescriptionAttribute;
                if (compareEnterDescriptionAttribute != null)
                {
                    // An EnterDescriptionAttribute should come before an EventDescriptionAttribute.
                    return 1;
                }
            }
            return result;
        }

        #endregion
    }
}