ZoneMembershipCondition.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / ZoneMembershipCondition.cs / 1 / ZoneMembershipCondition.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//  ZoneMembershipCondition.cs
// 
//  Implementation of membership condition for zones 
//
 
namespace System.Security.Policy {

 	using System;
	using SecurityManager = System.Security.SecurityManager; 
	using PermissionSet = System.Security.PermissionSet;
	using SecurityElement = System.Security.SecurityElement; 
 	using System.Collections; 
	using System.Globalization;
 
    [Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
    sealed public class ZoneMembershipCondition : IMembershipCondition, IConstantMembershipCondition
    { 
        //------------------------------------------------------
        // 
        // PRIVATE CONSTANTS 
        //
        //----------------------------------------------------- 

        private static readonly String[] s_names =
            {"MyComputer", "Intranet", "Trusted", "Internet", "Untrusted"};
 
        //-----------------------------------------------------
        // 
        // PRIVATE STATE DATA 
        //
        //----------------------------------------------------- 

        private SecurityZone m_zone;
        private SecurityElement m_element;
 
        //------------------------------------------------------
        // 
        // PUBLIC CONSTRUCTORS 
        //
        //----------------------------------------------------- 

        internal ZoneMembershipCondition()
        {
            m_zone = SecurityZone.NoZone; 
        }
 
        public ZoneMembershipCondition( SecurityZone zone ) 
        {
            VerifyZone( zone ); 

            this.SecurityZone = zone;
        }
 

        //------------------------------------------------------ 
        // 
        // PUBLIC ACCESSOR METHODS
        // 
        //------------------------------------------------------

        public SecurityZone SecurityZone
        { 
            set
            { 
                VerifyZone( value ); 

                m_zone = value; 
            }

            get
            { 
                if (m_zone == SecurityZone.NoZone && m_element != null)
                    ParseZone(); 
 
                return m_zone;
            } 
        }

        //-----------------------------------------------------
        // 
        // PRIVATE AND PROTECTED HELPERS FOR ACCESSORS AND CONSTRUCTORS
        // 
        //------------------------------------------------------ 

        private static void VerifyZone( SecurityZone zone ) 
        {
            if (zone < SecurityZone.MyComputer || zone > SecurityZone.Untrusted)
            {
                throw new ArgumentException( Environment.GetResourceString( "Argument_IllegalZone" ) ); 
            }
        } 
 
        //-----------------------------------------------------
        // 
        // IMEMBERSHIPCONDITION IMPLEMENTATION
        //
        //-----------------------------------------------------
 
        public bool Check( Evidence evidence )
        { 
            if (evidence == null) 
                return false;
 
            IEnumerator enumerator = evidence.GetHostEnumerator();
            while (enumerator.MoveNext())
            {
                Object obj = enumerator.Current; 

                if (obj is Zone) 
                { 
                    if (m_zone == SecurityZone.NoZone && m_element != null)
                        ParseZone(); 

                    if (((Zone)obj).SecurityZone == m_zone)
                    {
                        return true; 
                    }
                } 
            } 
            return false;
        } 

        public IMembershipCondition Copy()
        {
            if (m_zone == SecurityZone.NoZone && m_element != null) 
                ParseZone();
 
            return new ZoneMembershipCondition( m_zone ); 
        }
 
        public SecurityElement ToXml()
        {
            return ToXml( null );
        } 

        public void FromXml( SecurityElement e ) 
        { 
            FromXml( e, null );
        } 

        public SecurityElement ToXml( PolicyLevel level )
        {
            if (m_zone == SecurityZone.NoZone && m_element != null) 
                ParseZone();
 
            SecurityElement root = new SecurityElement( "IMembershipCondition" ); 
            System.Security.Util.XMLUtil.AddClassAttribute( root, this.GetType(), "System.Security.Policy.ZoneMembershipCondition" );
            // 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.
            BCLDebug.Assert( this.GetType().FullName.Equals( "System.Security.Policy.ZoneMembershipCondition" ), "Class name changed!" );

            root.AddAttribute( "version", "1" ); 

            if (m_zone != SecurityZone.NoZone) 
                root.AddAttribute( "Zone", Enum.GetName( typeof( SecurityZone ), m_zone ) ); 

            return root; 
        }

        public void FromXml( SecurityElement e, PolicyLevel level )
        { 
            if (e == null)
                throw new ArgumentNullException("e"); 
 
            if (!e.Tag.Equals( "IMembershipCondition" ))
            { 
                throw new ArgumentException( Environment.GetResourceString( "Argument_MembershipConditionElement" ) );
            }

            lock (this) 
            {
                m_zone = SecurityZone.NoZone; 
                m_element = e; 
            }
        } 

        private void ParseZone()
        {
            lock (this) 
            {
                if (m_element == null) 
                    return; 

                String eZone = m_element.Attribute( "Zone" ); 

                m_zone = SecurityZone.NoZone;
                if (eZone != null)
                { 
                    m_zone = (SecurityZone)Enum.Parse( typeof( SecurityZone ), eZone );
                } 
                else 
                {
                    throw new ArgumentException( Environment.GetResourceString( "Argument_ZoneCannotBeNull" ) ); 
                }
                VerifyZone(m_zone);

                m_element = null; 
            }
        } 
 
        public override bool Equals( Object o )
        { 
            ZoneMembershipCondition that = (o as ZoneMembershipCondition);

            if (that != null)
            { 
                if (this.m_zone == SecurityZone.NoZone && this.m_element != null)
                    this.ParseZone(); 
                if (that.m_zone == SecurityZone.NoZone && that.m_element != null) 
                    that.ParseZone();
 
                if(this.m_zone == that.m_zone)
                {
                    return true;
                } 
            }
            return false; 
        } 

        public override int GetHashCode() 
        {
            if (this.m_zone == SecurityZone.NoZone && this.m_element != null)
                this.ParseZone();
 
            return (int)m_zone;
        } 
 
        public override String ToString()
        { 
            if (m_zone == SecurityZone.NoZone && m_element != null)
                ParseZone();

            return String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "Zone_ToString" ), s_names[(int)m_zone] ); 
        }
    } 
}

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