using System;

namespace Domain
{
	/// <summary>
	/// This represents the domain entity system-identifier.
	/// </summary>
	public sealed class SystemIdentifier
	{
		#region member data

		/// <summary>
		/// this is the system identifier
		/// </summary>
		private Int64 sid;

		#endregion member data

		#region constructors

		/// <summary>
		/// initialize with defaults
		/// </summary>
		public SystemIdentifier()
		{
		}

		/// <summary>
		/// initialize with specified identifier
		/// </summary>
		/// <param name="sid">system identifier</param>
		public SystemIdentifier(Int16 sid)
		{
			this.sid = sid;
		}

		/// <summary>
		/// initialize with specified identifier
		/// </summary>
		/// <param name="sid">system identifier</param>
		public SystemIdentifier(Int32 sid)
		{
			this.sid = sid;
		}

		/// <summary>
		/// initialize with specified identifier
		/// </summary>
		/// <param name="sid">system identifier</param>
		public SystemIdentifier(Int64 sid)
		{
			this.sid = sid;
		}

		/// <summary>
		/// initialize with specified identifier
		/// </summary>
		/// <param name="sid">system identifier</param>
		public SystemIdentifier(Decimal sid)
		{
			this.sid = Convert.ToInt64(sid);
		}

		/// <summary>
		/// initialize with specified identifier
		/// </summary>
		/// <param name="sid">system identifier</param>
		public SystemIdentifier(String sid)
		{
			this.sid = Convert.ToInt64(sid);
		}

		#endregion constructors

		#region member functions

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator short(SystemIdentifier sid) 
		{
			return Convert.ToInt16(sid.sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator SystemIdentifier(short sid)
		{
			return new SystemIdentifier(sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator int(SystemIdentifier sid) 
		{
			return Convert.ToInt32(sid.sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator SystemIdentifier(int sid)
		{
			return new SystemIdentifier(sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator long(SystemIdentifier sid) 
		{
			return sid.sid;
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator SystemIdentifier(long sid)
		{
			return new SystemIdentifier(sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator decimal(SystemIdentifier sid) 
		{
			return Convert.ToDecimal(sid.sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator SystemIdentifier(decimal sid)
		{
			return new SystemIdentifier(sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator string(SystemIdentifier sid) 
		{
			return Convert.ToString(sid.sid);
		}

		/// <summary>
		/// this implicitly casts SystemIdentifier
		/// </summary>
		/// <param name="sid">SystemIdentifier</param>
		/// <returns>casted sid</returns>
		public static implicit operator SystemIdentifier(string sid)
		{
			return new SystemIdentifier(sid);
		}

		/// <summary>
		/// Returns a <see cref="System.String"/> that represents the current
		/// <see cref="System.Object"/>.
		/// </summary>
		/// <returns>A <see cref="System.String"/> that represents the current
		/// <see cref="System.Object"/>.</returns>
		public override string ToString()
		{
			return Convert.ToString(this.sid);
		}

		#endregion member functions
	}
}