ZoneMembershipCondition.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Policy / ZoneMembershipCondition.cs / 1305376 / ZoneMembershipCondition.cs
                        
                        
                            using System.Diagnostics.Contracts; 
// ==++==
//
//   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, IReportMatchMembershipCondition 
    { 
        //------------------------------------------------------
        // 
        // 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" ) ); 
            }
            Contract.EndContractBlock(); 
        }

        //-----------------------------------------------------
        // 
        // IMEMBERSHIPCONDITION IMPLEMENTATION
        // 
        //----------------------------------------------------- 

        public bool Check( Evidence evidence ) 
        {
            object usedEvidence = null;
            return (this as IReportMatchMembershipCondition).Check(evidence, out usedEvidence);
        } 

        bool IReportMatchMembershipCondition.Check(Evidence evidence, out object usedEvidence) 
        { 
            usedEvidence = null;
 
            if (evidence == null)
                return false;

            Zone zone = evidence.GetHostEvidence(); 
            if (zone != null)
            { 
                if (m_zone == SecurityZone.NoZone && m_element != null) 
                {
                    ParseZone(); 
                }

                if (zone.SecurityZone == m_zone)
                { 
                    usedEvidence = 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.
            Contract.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" ) );
            } 
            Contract.EndContractBlock();
 
            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] ); 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
using System.Diagnostics.Contracts; 
// ==++==
//
//   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, IReportMatchMembershipCondition 
    { 
        //------------------------------------------------------
        // 
        // 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" ) ); 
            }
            Contract.EndContractBlock(); 
        }

        //-----------------------------------------------------
        // 
        // IMEMBERSHIPCONDITION IMPLEMENTATION
        // 
        //----------------------------------------------------- 

        public bool Check( Evidence evidence ) 
        {
            object usedEvidence = null;
            return (this as IReportMatchMembershipCondition).Check(evidence, out usedEvidence);
        } 

        bool IReportMatchMembershipCondition.Check(Evidence evidence, out object usedEvidence) 
        { 
            usedEvidence = null;
 
            if (evidence == null)
                return false;

            Zone zone = evidence.GetHostEvidence(); 
            if (zone != null)
            { 
                if (m_zone == SecurityZone.NoZone && m_element != null) 
                {
                    ParseZone(); 
                }

                if (zone.SecurityZone == m_zone)
                { 
                    usedEvidence = 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.
            Contract.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" ) );
            } 
            Contract.EndContractBlock();
 
            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] ); 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ZoneMembershipCondition.cs source code in C# .NET

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