dataprotectionpermission.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Security / System / Security / permissions / dataprotectionpermission.cs / 1305376 / dataprotectionpermission.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
//  DataProtectionPermission.cs 
//

namespace System.Security.Permissions {
    using System.Globalization; 

    [Serializable()] 
    public sealed class DataProtectionPermission : CodeAccessPermission, IUnrestrictedPermission { 
        private DataProtectionPermissionFlags m_flags;
 
        public DataProtectionPermission (PermissionState state) {
            if (state == PermissionState.Unrestricted)
                m_flags = DataProtectionPermissionFlags.AllFlags;
            else if (state == PermissionState.None) 
                m_flags = DataProtectionPermissionFlags.NoFlags;
            else 
                throw new ArgumentException(SecurityResources.GetResourceString("Argument_InvalidPermissionState")); 
        }
 
        public DataProtectionPermission (DataProtectionPermissionFlags flag) {
            this.Flags = flag;
        }
 
        public DataProtectionPermissionFlags Flags {
            set { 
                VerifyFlags(value); 
                m_flags = value;
            } 
            get {
                return m_flags;
            }
        } 

        // 
        // IUnrestrictedPermission implementation 
        //
 
        public bool IsUnrestricted ()  {
            return m_flags == DataProtectionPermissionFlags.AllFlags;
        }
 
        //
        // IPermission implementation 
        // 

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

            try { 
                DataProtectionPermission operand = (DataProtectionPermission) target;
                DataProtectionPermissionFlags flag_union = m_flags | operand.m_flags; 
                if (flag_union == DataProtectionPermissionFlags.NoFlags) 
                    return null;
                else 
                    return new DataProtectionPermission(flag_union);
            }
            catch (InvalidCastException) {
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SecurityResources.GetResourceString("Argument_WrongType"), this.GetType().FullName)); 
            }
        } 
 
        public override bool IsSubsetOf (IPermission target) {
            if (target == null) 
                return m_flags == DataProtectionPermissionFlags.NoFlags;

            try {
                DataProtectionPermission operand = (DataProtectionPermission) target; 
                DataProtectionPermissionFlags sourceFlag = this.m_flags;
                DataProtectionPermissionFlags targetFlag = operand.m_flags; 
                return ((sourceFlag & targetFlag) == sourceFlag); 
            }
            catch (InvalidCastException) { 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SecurityResources.GetResourceString("Argument_WrongType"), this.GetType().FullName));
            }
        }
 
        public override IPermission Intersect (IPermission target) {
            if (target == null) 
                return null; 

            try { 
                DataProtectionPermission operand = (DataProtectionPermission) target;
                DataProtectionPermissionFlags flag_intersect = operand.m_flags & this.m_flags;
                if (flag_intersect == DataProtectionPermissionFlags.NoFlags)
                    return null; 
                else
                    return new DataProtectionPermission(flag_intersect); 
            } 
            catch (InvalidCastException) {
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SecurityResources.GetResourceString("Argument_WrongType"), this.GetType().FullName)); 
            }
        }

        public override IPermission Copy () { 
            if (this.Flags == DataProtectionPermissionFlags.NoFlags)
                return null; 
            return new DataProtectionPermission(m_flags); 
        }
 
        //
        // FromXml/ToXml
        //
 
        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(SecurityResources.GetResourceString("Argument_InvalidClassAttribute"), "securityElement"); 

            string unrestricted = securityElement.Attribute("Unrestricted"); 
            if (unrestricted != null && String.Compare(unrestricted, "true", StringComparison.OrdinalIgnoreCase) == 0) { 
                m_flags = DataProtectionPermissionFlags.AllFlags;
                return; 
            }

            m_flags = DataProtectionPermissionFlags.NoFlags;
            string strFlags = securityElement.Attribute("Flags"); 
            if (strFlags != null) {
                DataProtectionPermissionFlags flags = (DataProtectionPermissionFlags) Enum.Parse(typeof(DataProtectionPermissionFlags), strFlags); 
                VerifyFlags(flags); 
                m_flags = flags;
            } 
        }

        internal static void VerifyFlags (DataProtectionPermissionFlags flags) {
            if ((flags & ~DataProtectionPermissionFlags.AllFlags) != 0) 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SecurityResources.GetResourceString("Arg_EnumIllegalVal"), (int)flags));
        } 
    } 
}

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

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