// ==++==
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
// <OWNER>Microsoft</OWNER>
// 
 
//
//  Site.cs
//
//  Site is an IIdentity representing internet sites.
//
 
using System;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Security.Permissions;
using System.Security.Util;
 
namespace System.Security.Policy
{
    [Serializable]
    [System.Runtime.InteropServices.ComVisible(true)]
    public sealed class Site : EvidenceBase, IIdentityPermissionFactory
    {
        private SiteString m_name;
 
        public Site(String name)
        {
            if (name == null)
                throw new ArgumentNullException("name");
            Contract.EndContractBlock();
 
            m_name = new SiteString( name );
        }
 
        private Site(SiteString name)
        {
            Contract.Assert(name != null);
            m_name = name;
        }
 
        public static Site CreateFromUrl( String url )
        {
            return new Site(ParseSiteFromUrl(url));
        }
 
        private static SiteString ParseSiteFromUrl( String name )
        {
            URLString urlString = new URLString( name );
 
            if (String.Compare( urlString.Scheme, "file", StringComparison.OrdinalIgnoreCase) == 0)
                throw new ArgumentException( Environment.GetResourceString( "Argument_InvalidSite" ) );
 
            return new SiteString( new URLString( name ).Host );
        }
 
        public String Name
        {
            get { return m_name.ToString(); }
        }
 
        internal SiteString GetSiteString()
        {
            return m_name;
        }
 
        public IPermission CreateIdentityPermission( Evidence evidence )
        {
            return new SiteIdentityPermission( Name );
        }
 
        public override bool Equals(Object o)
        {
            Site other = o as Site;
            if (other == null)
            {
                return false;
            }
 
            return String.Equals(Name, other.Name, StringComparison.OrdinalIgnoreCase);
        }
 
        public override int GetHashCode()
        {
            return Name.GetHashCode();
        }
 
        public override EvidenceBase Clone()
        {
            return new Site(m_name);
        }
 
        public Object Copy()
        {
            return Clone();
        }
 
#if FEATURE_CAS_POLICY
        internal SecurityElement ToXml()
        {
            SecurityElement elem = new SecurityElement( "System.Security.Policy.Site" );
            // If you hit this assert then most likely you are trying to change the name of this class. 
            // This is ok as long as you change the hard coded string above and change the assert below.
            Contract.Assert( this.GetType().FullName.Equals( "System.Security.Policy.Site" ), "Class name changed!" );
 
            elem.AddAttribute( "version", "1" );
            
            if(m_name != null)
                elem.AddChild( new SecurityElement( "Name", m_name.ToString() ) );
                
            return elem;
        }
#endif // FEATURE_CAS_POLICY
 
#if FEATURE_CAS_POLICY
        public override String ToString()
        {
            return ToXml().ToString();
        }
#endif // FEATURE_CAS_POLICY
 
        // INormalizeForIsolatedStorage is not implemented for startup perf
        // equivalent to INormalizeForIsolatedStorage.Normalize()
        internal Object Normalize()
        {
            return m_name.ToString().ToUpper(CultureInfo.InvariantCulture);
        }
    }
}