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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