storepermission.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 / fx / src / security / system / security / permissions / storepermission.cs / 1 / storepermission.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

// 
//  StorePermission.cs 
//
 
namespace System.Security.Permissions {
    using System.Globalization;

    [Serializable()] 
    public sealed class StorePermission : CodeAccessPermission, IUnrestrictedPermission {
        private StorePermissionFlags m_flags; 
 
        public StorePermission (PermissionState state) {
            if (state == PermissionState.Unrestricted) 
                m_flags = StorePermissionFlags.AllFlags;
            else if (state == PermissionState.None)
                m_flags = StorePermissionFlags.NoFlags;
            else 
                throw new ArgumentException(SR.GetString(SR.Argument_InvalidPermissionState));
        } 
 
        public StorePermission (StorePermissionFlags flag) {
            VerifyFlags(flag); 
            m_flags = flag;
        }

        public StorePermissionFlags Flags { 
            set {
                VerifyFlags(value); 
                m_flags = value; 
            }
            get { 
                return m_flags;
            }
        }
 
        //
        // IUnrestrictedPermission implementation 
        // 

        public bool IsUnrestricted ()  { 
            return m_flags == StorePermissionFlags.AllFlags;
        }

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

            try {
                StorePermission operand = (StorePermission) target; 
                StorePermissionFlags flag_union = m_flags | operand.m_flags;
                if (flag_union == StorePermissionFlags.NoFlags) 
                    return null; 
                else
                    return new StorePermission(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 == StorePermissionFlags.NoFlags; 

            try {
                StorePermission operand = (StorePermission) target;
                StorePermissionFlags sourceFlag = this.m_flags; 
                StorePermissionFlags 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 {
                StorePermission operand = (StorePermission) target; 
                StorePermissionFlags flag_intersect = operand.m_flags & this.m_flags;
                if (flag_intersect == StorePermissionFlags.NoFlags)
                    return null;
                else 
                    return new StorePermission(flag_intersect);
            } 
            catch (InvalidCastException) { 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Argument_WrongType), this.GetType().FullName));
            } 
        }

        public override IPermission Copy () {
            if (this.Flags == StorePermissionFlags.NoFlags) 
                return null;
            return new StorePermission((StorePermissionFlags)m_flags); 
        } 

        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 = StorePermissionFlags.AllFlags; 
                return;
            } 
 
            m_flags = StorePermissionFlags.NoFlags;
            String strFlags = securityElement.Attribute("Flags"); 
            if (strFlags != null) {
                StorePermissionFlags flags = (StorePermissionFlags) Enum.Parse(typeof(StorePermissionFlags), strFlags);
                VerifyFlags(flags);
                m_flags = flags; 
            }
        } 
 
        internal static void VerifyFlags (StorePermissionFlags flags) {
            if ((flags & ~StorePermissionFlags.AllFlags) != 0) 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.Arg_EnumIllegalVal), (int)flags));
        }
    }
}

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