typedescriptorpermission.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / security / system / security / permissions / typedescriptorpermission.cs / 1305376 / typedescriptorpermission.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// TypeDescriptorPermission.cs
// 
// wilcob 
//
 
namespace System.Security.Permissions
{
    using System;
    using System.IO; 
    using System.Text;
    using System.Runtime.InteropServices; 
    using System.Runtime.Remoting; 
    using System.Security;
    using System.Reflection; 
    using System.Globalization;
    using System.Diagnostics.Contracts;

    [Flags] 
    [Serializable]
    public enum TypeDescriptorPermissionFlags 
    { 
        NoFlags = 0,
        RestrictedRegistrationAccess = 1 
    }

    [Serializable]
    sealed public class TypeDescriptorPermission 
           : CodeAccessPermission, IUnrestrictedPermission
    { 
        private TypeDescriptorPermissionFlags m_flags; 

        public TypeDescriptorPermission(PermissionState state) 
        {
            if (state == PermissionState.Unrestricted)
            {
                SetUnrestricted(true); 
            }
            else if (state == PermissionState.None) 
            { 
                SetUnrestricted(false);
            } 
            else
            {
                throw new ArgumentException(SR.GetString(SR.Argument_InvalidPermissionState));
            } 
        }
 
        public TypeDescriptorPermission(TypeDescriptorPermissionFlags flag) 
        {
            VerifyAccess(flag); 

            SetUnrestricted(false);
            m_flags = flag;
        } 

        private void SetUnrestricted(bool unrestricted) 
        { 
            if (unrestricted)
            { 
                m_flags = TypeDescriptorPermissionFlags.RestrictedRegistrationAccess;
            }
            else
            { 
                Reset();
            } 
        } 

        private void Reset() 
        {
            m_flags = TypeDescriptorPermissionFlags.NoFlags;
        }
 

        public TypeDescriptorPermissionFlags Flags 
        { 
            set
            { 
                VerifyAccess(value);
                m_flags = value;
            }
 
            get
            { 
                return m_flags; 
            }
        } 


        //
        // CodeAccessPermission implementation 
        //
 
        public bool IsUnrestricted() 
        {
            return m_flags == TypeDescriptorPermissionFlags.RestrictedRegistrationAccess; 
        }

        //
        // IPermission implementation 
        //
 
        public override IPermission Union(IPermission target) 
        {
            if (target == null) 
                return this.Copy();

            try
            { 
                TypeDescriptorPermission operand = (TypeDescriptorPermission)target;
                TypeDescriptorPermissionFlags flag_union = m_flags | operand.m_flags; 
                if (flag_union == TypeDescriptorPermissionFlags.NoFlags) 
                    return null;
                else 
                    return new TypeDescriptorPermission(flag_union);
            }
            catch (InvalidCastException)
            { 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Argument_WrongType), this.GetType().FullName));
            } 
        } 

        public override bool IsSubsetOf(IPermission target) 
        {
            if (target == null)
                return m_flags == TypeDescriptorPermissionFlags.NoFlags;
 
            try
            { 
                TypeDescriptorPermission operand = (TypeDescriptorPermission)target; 
                TypeDescriptorPermissionFlags sourceFlag = this.m_flags;
                TypeDescriptorPermissionFlags targetFlag = operand.m_flags; 
                return ((sourceFlag & targetFlag) == sourceFlag);
            }
            catch (InvalidCastException)
            { 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Argument_WrongType), this.GetType().FullName));
            } 
        } 

        public override IPermission Intersect(IPermission target) 
        {
            if (target == null)
                return null;
 
            try
            { 
                TypeDescriptorPermission operand = (TypeDescriptorPermission)target; 
                TypeDescriptorPermissionFlags flag_intersect = operand.m_flags & this.m_flags;
                if (flag_intersect == TypeDescriptorPermissionFlags.NoFlags) 
                    return null;
                else
                    return new TypeDescriptorPermission(flag_intersect);
            } 
            catch (InvalidCastException)
            { 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Argument_WrongType), this.GetType().FullName)); 
            }
        } 

        public override IPermission Copy()
        {
            return new TypeDescriptorPermission((TypeDescriptorPermissionFlags)m_flags); 
        }
 
        private void VerifyAccess(TypeDescriptorPermissionFlags type) 
        {
            if ((type & ~TypeDescriptorPermissionFlags.RestrictedRegistrationAccess) != 0) 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Arg_EnumIllegalVal), (int)type));
            Contract.EndContractBlock();
        }
 
        public override SecurityElement ToXml()
        { 
            SecurityElement securityElement = new SecurityElement("IPermission"); 
            securityElement.AddAttribute("class", this.GetType().FullName + ", " + this.GetType().Module.Assembly.FullName.Replace('\"', '\''));
            securityElement.AddAttribute("version", "1"); 
            if (!IsUnrestricted())
                securityElement.AddAttribute("Flags", m_flags.ToString());
            else
                securityElement.AddAttribute("Unrestricted", "true"); 

            return securityElement; 
        } 

        public override void FromXml(SecurityElement securityElement) 
        {
            if (securityElement == null)
                throw new ArgumentNullException("securityElement");
 
            string className = securityElement.Attribute("class");
            if (className == null || className.IndexOf(this.GetType().FullName, StringComparison.Ordinal) == -1) 
                throw new ArgumentException(SR.GetString(SR.Argument_InvalidClassAttribute), "securityElement"); 

            string unrestricted = securityElement.Attribute("Unrestricted"); 
            if (unrestricted != null && String.Compare(unrestricted, "true", StringComparison.OrdinalIgnoreCase) == 0)
            {
                m_flags = TypeDescriptorPermissionFlags.RestrictedRegistrationAccess;
                return; 
            }
 
            m_flags = TypeDescriptorPermissionFlags.NoFlags; 
            String strFlags = securityElement.Attribute("Flags");
            if (strFlags != null) 
            {
                TypeDescriptorPermissionFlags flags = (TypeDescriptorPermissionFlags)Enum.Parse(typeof(TypeDescriptorPermissionFlags), strFlags);
                VerifyFlags(flags);
                m_flags = flags; 
            }
        } 
 
        internal static void VerifyFlags(TypeDescriptorPermissionFlags flags)
        { 
            if ((flags & ~TypeDescriptorPermissionFlags.RestrictedRegistrationAccess) != 0)
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Arg_EnumIllegalVal), (int)flags));
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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typedescriptorpermission.cs source code in C# .NET

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