SiteMembershipCondition.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 / SiteMembershipCondition.cs / 1 / SiteMembershipCondition.cs
                        

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

 	using System;
	using SecurityManager = System.Security.SecurityManager; 
	using SiteString = System.Security.Util.SiteString;
	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 SiteMembershipCondition : IMembershipCondition, IConstantMembershipCondition 
    {
 
        //------------------------------------------------------ 
        //
        // PRIVATE STATE DATA 
        //
        //-----------------------------------------------------

        private SiteString m_site; 
        private SecurityElement m_element;
 
        //----------------------------------------------------- 
        //
        // PUBLIC CONSTRUCTORS 
        //
        //-----------------------------------------------------

        internal SiteMembershipCondition() 
        {
            m_site = null; 
        } 

        public SiteMembershipCondition( String site ) 
        {
            if (site == null)
                throw new ArgumentNullException( "site" );
 
            m_site = new SiteString( site );
        } 
 
        //------------------------------------------------------
        // 
        // PUBLIC ACCESSOR METHODS
        //
        //-----------------------------------------------------
 

        public String Site 
        { 
            set
            { 
                if (value == null)
                    throw new ArgumentNullException( "value" );

                m_site = new SiteString( value ); 
            }
 
            get 
            {
                if (m_site == null && m_element != null) 
                    ParseSite();

                if (m_site != null)
                    return m_site.ToString(); 
                else
                    return ""; 
            } 
        }
 
        //------------------------------------------------------
        //
        // 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 Site) 
                {
                    if (m_site == null && m_element != null) 
                        ParseSite();

                    if (((Site)obj).GetSiteString().IsSubsetOf( this.m_site ))
                    { 
                        return true;
                    } 
                } 
            }
            return false; 
        }

        public IMembershipCondition Copy()
        { 
            if (m_site == null && m_element != null)
                ParseSite(); 
 
            return new SiteMembershipCondition( m_site.ToString() );
        } 


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

        public SecurityElement ToXml( PolicyLevel level ) 
        {
            if (m_site == null && m_element != null) 
                ParseSite(); 

            SecurityElement root = new SecurityElement( "IMembershipCondition" ); 
            System.Security.Util.XMLUtil.AddClassAttribute( root, this.GetType(), "System.Security.Policy.SiteMembershipCondition" );
            // 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.SiteMembershipCondition" ), "Class name changed!" ); 

            root.AddAttribute( "version", "1" ); 
 
            if (m_site != null)
                root.AddAttribute( "Site", m_site.ToString() ); 

            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_site = null;
                m_element = e; 
            }
        }

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

                String elSite = m_element.Attribute( "Site" );
                if (elSite == null)
                    throw new ArgumentException( Environment.GetResourceString( "Argument_SiteCannotBeNull" ) ); 
                else
                    m_site = new SiteString( elSite ); 
                m_element = null; 
            }
        } 

        public override bool Equals( Object o )
        {
            SiteMembershipCondition that = (o as SiteMembershipCondition); 

            if (that != null) 
            { 
                if (this.m_site == null && this.m_element != null)
                    this.ParseSite(); 
                if (that.m_site == null && that.m_element != null)
                    that.ParseSite();

                if( Equals (this.m_site, that.m_site )) 
                {
                    return true; 
                } 
            }
            return false; 
        }

        public override int GetHashCode()
        { 
            if (m_site == null && m_element != null)
                ParseSite(); 
 
            if (m_site != null)
            { 
                return m_site.GetHashCode();
            }
            else
            { 
                return typeof( SiteMembershipCondition ).GetHashCode();
            } 
        } 

        public override String ToString() 
        {
            if (m_site == null && m_element != null)
                ParseSite();
 
            if (m_site != null)
                return String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "Site_ToStringArg" ), m_site ); 
            else 
                return Environment.GetResourceString( "Site_ToString" );
        } 
    }
}

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