// ==++==
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
// <OWNER>Microsoft</OWNER>
// 
 
using System;
using System.Security.Policy; // defines Url class
using System.Globalization;
using System.Diagnostics.Contracts;
 
namespace System.Security.Principal
{
[System.Runtime.InteropServices.ComVisible(false)]
    public abstract class IdentityReference
    {
        internal IdentityReference()
        {
            // exists to prevent creation user-derived classes (for now)
        }
        
//      public abstract string Scheme { get; }
 
        public abstract string Value { get; }
 
//      public virtual Url Url
//      {
//          get { return new Url(""); } // 
 
 
        public abstract bool IsValidTargetType( Type targetType );
 
        public abstract IdentityReference Translate( Type targetType );
 
        public override abstract bool Equals( object o );
 
        public override abstract int GetHashCode();
 
        public override abstract string ToString();
 
        public static bool operator==( IdentityReference left, IdentityReference right )
        {
            object l = left;
            object r = right;
 
            if ( l == null && r == null )
            {
                return true;
            }
            else if ( l == null || r == null )
            {
                return false;
            }
            else
            {
                return left.Equals( right );
            }
        }
 
        public static bool operator!=( IdentityReference left, IdentityReference right )
        {
            return !( left == right ); // invoke operator==
        }
    }
}