2 // System.Security.Permissions.DataProtectionPermission class
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Globalization;
33 namespace System.Security.Permissions {
36 public sealed class DataProtectionPermission : CodeAccessPermission, IUnrestrictedPermission {
38 private const int version = 1;
40 private DataProtectionPermissionFlags _flags;
43 public DataProtectionPermission (PermissionState state)
45 if (PermissionHelper.CheckPermissionState (state, true) == PermissionState.Unrestricted)
46 _flags = DataProtectionPermissionFlags.AllFlags;
48 _flags = DataProtectionPermissionFlags.NoFlags;
51 public DataProtectionPermission (DataProtectionPermissionFlags flags)
53 // reuse validation by the Flags property
58 public DataProtectionPermissionFlags Flags {
59 get { return _flags; }
61 if (!Enum.IsDefined (typeof (DataProtectionPermissionFlags), value)) {
62 string msg = String.Format (Locale.GetText ("Invalid enum {0}"), value);
63 throw new ArgumentException (msg, "DataProtectionPermissionFlags");
69 public bool IsUnrestricted ()
71 return (_flags == DataProtectionPermissionFlags.AllFlags);
74 public override IPermission Copy ()
76 return new DataProtectionPermission (_flags);
79 public override IPermission Intersect (IPermission target)
81 DataProtectionPermission dp = Cast (target);
85 if (this.IsUnrestricted () && dp.IsUnrestricted ())
86 return new DataProtectionPermission (PermissionState.Unrestricted);
87 if (this.IsUnrestricted ())
89 if (dp.IsUnrestricted ())
91 return new DataProtectionPermission (_flags & dp._flags);
94 public override IPermission Union (IPermission target)
96 DataProtectionPermission dp = Cast (target);
100 if (this.IsUnrestricted () || dp.IsUnrestricted ())
101 return new SecurityPermission (PermissionState.Unrestricted);
103 return new DataProtectionPermission (_flags | dp._flags);
106 public override bool IsSubsetOf (IPermission target)
108 DataProtectionPermission dp = Cast (target);
110 return (_flags == DataProtectionPermissionFlags.NoFlags);
112 if (dp.IsUnrestricted ())
114 if (this.IsUnrestricted ())
117 return ((_flags & ~dp._flags) == 0);
120 public override void FromXml (SecurityElement e)
122 // General validation in CodeAccessPermission
123 PermissionHelper.CheckSecurityElement (e, "e", version, version);
124 // Note: we do not (yet) care about the return value
125 // as we only accept version 1 (min/max values)
127 _flags = (DataProtectionPermissionFlags) Enum.Parse (
128 typeof (DataProtectionPermissionFlags), e.Attribute ("Flags"));
131 public override SecurityElement ToXml ()
133 SecurityElement e = PermissionHelper.Element (typeof (DataProtectionPermission), version);
134 e.AddAttribute ("Flags", _flags.ToString ());
140 private DataProtectionPermission Cast (IPermission target)
145 DataProtectionPermission dp = (target as DataProtectionPermission);
147 PermissionHelper.ThrowInvalidPermission (target, typeof (DataProtectionPermission));