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.
30 using System.Globalization;
32 namespace System.Security.Permissions {
35 public sealed class DataProtectionPermission : CodeAccessPermission, IUnrestrictedPermission {
37 private const int version = 1;
39 private DataProtectionPermissionFlags _flags;
42 public DataProtectionPermission (PermissionState state)
44 if (PermissionHelper.CheckPermissionState (state, true) == PermissionState.Unrestricted)
45 _flags = DataProtectionPermissionFlags.AllFlags;
48 public DataProtectionPermission (DataProtectionPermissionFlags flags)
50 // reuse validation by the Flags property
55 public DataProtectionPermissionFlags Flags {
56 get { return _flags; }
58 if ((value & ~DataProtectionPermissionFlags.AllFlags) != 0) {
59 string msg = String.Format (Locale.GetText ("Invalid enum {0}"), value);
60 throw new ArgumentException (msg, "DataProtectionPermissionFlags");
66 public bool IsUnrestricted ()
68 return (_flags == DataProtectionPermissionFlags.AllFlags);
71 public override IPermission Copy ()
73 return new DataProtectionPermission (_flags);
76 public override IPermission Intersect (IPermission target)
78 DataProtectionPermission dp = Cast (target);
82 if (this.IsUnrestricted () && dp.IsUnrestricted ())
83 return new DataProtectionPermission (PermissionState.Unrestricted);
84 if (this.IsUnrestricted ())
86 if (dp.IsUnrestricted ())
88 return new DataProtectionPermission (_flags & dp._flags);
91 public override IPermission Union (IPermission target)
93 DataProtectionPermission dp = Cast (target);
97 if (this.IsUnrestricted () || dp.IsUnrestricted ())
98 return new SecurityPermission (PermissionState.Unrestricted);
100 return new DataProtectionPermission (_flags | dp._flags);
103 public override bool IsSubsetOf (IPermission target)
105 DataProtectionPermission dp = Cast (target);
107 return (_flags == DataProtectionPermissionFlags.NoFlags);
109 if (dp.IsUnrestricted ())
111 if (this.IsUnrestricted ())
114 return ((_flags & ~dp._flags) == 0);
117 public override void FromXml (SecurityElement e)
119 // General validation in CodeAccessPermission
120 PermissionHelper.CheckSecurityElement (e, "e", version, version);
121 // Note: we do not (yet) care about the return value
122 // as we only accept version 1 (min/max values)
124 _flags = (DataProtectionPermissionFlags) Enum.Parse (
125 typeof (DataProtectionPermissionFlags), e.Attribute ("Flags"));
128 public override SecurityElement ToXml ()
130 SecurityElement e = PermissionHelper.Element (typeof (DataProtectionPermission), version);
131 e.AddAttribute ("Flags", _flags.ToString ());
137 private DataProtectionPermission Cast (IPermission target)
142 DataProtectionPermission dp = (target as DataProtectionPermission);
144 PermissionHelper.ThrowInvalidPermission (target, typeof (DataProtectionPermission));