using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Serialization;

namespace CommandDemo
{
    [Serializable()]
    public class Command : IDisposable, ISerializable
    {
        #region Public Delegates
		public delegate void CommandCallback(object[] args); 
	    #endregion

        #region Private Fields
        private bool _disposed;
        private CommandCallback _callback;
        private object[] _arguments; 
	    #endregion

        #region Public Fields
        public CommandCallback Callback
        {
            get { return this._callback; }
            set { this._callback = value; }
        }

        public object[] Arguments
        {
            get { return this._arguments; }
            set { this._arguments = value; }
        } 
	    #endregion

        #region Constructors
        public Command()
        {
            this._disposed = false;
            this._callback = null;
            this._arguments = null;
        }

        public Command(CommandCallback callback)
        {
            this._disposed = false;
            this._callback = callback;
            this._arguments = null;
        }

        public Command(CommandCallback callback, object[] args)
        {
            this._disposed = false;
            this._callback = callback;
            this._arguments = args;
        }        
	    #endregion

        #region Disposing Methods
        ~Command()
        {
            this.Dispose();
        }

        public void Dispose()
        {
            if (!this._disposed)
            {
                if (this._callback != null)
                {
                    this._callback = null;
                }
                if (this._arguments != null)
                {
                    this._arguments = null;
                }
                this._disposed = true;
                GC.SuppressFinalize(this);
            }
        } 
        #endregion

        #region Serialization Methods
        public Command(SerializationInfo info, StreamingContext context)
        {
            this._callback = (CommandCallback)info.GetValue("Callback", typeof(CommandCallback));
            this._arguments = (object[])info.GetValue("Arguments", typeof(object[]));
        }

        public void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue("Callback", this._callback);
            info.AddValue("Arguments", this._arguments);
        }
        #endregion

        #region Public Methods
        public void Execute()
        {
            if (this._callback != null)
            {
                this._callback(this._arguments);
            }
        }

        public void Execute(object[] args)
        {
            this._arguments = args;
            this.Execute();
        }
        #endregion
    }
}