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//
// System.Security.Permissions.HostProtectionPermission.cs
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Globalization;
namespace System.Security.Permissions {
[Serializable]
internal sealed class HostProtectionPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
private const int version = 1;
private HostProtectionResource _resources;
// constructors
public HostProtectionPermission (PermissionState state)
{
if (CheckPermissionState (state, true) == PermissionState.Unrestricted)
_resources = HostProtectionResource.All;
else
_resources = HostProtectionResource.None;
}
public HostProtectionPermission (HostProtectionResource resources)
{
// reuse validation by the Flags property
Resources = _resources;
}
public HostProtectionResource Resources {
get { return _resources; }
set {
if (!Enum.IsDefined (typeof (HostProtectionResource), value)) {
string msg = String.Format (Locale.GetText ("Invalid enum {0}"), value);
throw new ArgumentException (msg, "HostProtectionResource");
}
_resources = value;
}
}
public override IPermission Copy ()
{
return new HostProtectionPermission (_resources);
}
public override IPermission Intersect (IPermission target)
{
HostProtectionPermission hpp = Cast (target);
if (hpp == null)
return null;
if (this.IsUnrestricted () && hpp.IsUnrestricted ())
return new HostProtectionPermission (PermissionState.Unrestricted);
if (this.IsUnrestricted ())
return hpp.Copy ();
if (hpp.IsUnrestricted ())
return this.Copy ();
return new HostProtectionPermission (_resources & hpp._resources);
}
public override IPermission Union (IPermission target)
{
HostProtectionPermission hpp = Cast (target);
if (hpp == null)
return this.Copy ();
if (this.IsUnrestricted () || hpp.IsUnrestricted ())
return new HostProtectionPermission (PermissionState.Unrestricted);
return new HostProtectionPermission (_resources | hpp._resources);
}
public override bool IsSubsetOf (IPermission target)
{
HostProtectionPermission hpp = Cast (target);
if (hpp == null)
return (_resources == HostProtectionResource.None);
if (hpp.IsUnrestricted ())
return true;
if (this.IsUnrestricted ())
return false;
return ((_resources & ~hpp._resources) == 0);
}
public override void FromXml (SecurityElement e)
{
// General validation in CodeAccessPermission
CheckSecurityElement (e, "e", version, version);
// Note: we do not (yet) care about the return value
// as we only accept version 1 (min/max values)
_resources = (HostProtectionResource) Enum.Parse (
typeof (HostProtectionResource), e.Attribute ("Resources"));
}
public override SecurityElement ToXml ()
{
SecurityElement e = Element (version);
e.AddAttribute ("Resources", _resources.ToString ());
return e;
}
// IUnrestrictedPermission
public bool IsUnrestricted ()
{
return (_resources == HostProtectionResource.All);
}
// IBuiltInPermission
int IBuiltInPermission.GetTokenIndex ()
{
return (int) BuiltInToken.HostProtection;
}
// helpers
private HostProtectionPermission Cast (IPermission target)
{
if (target == null)
return null;
HostProtectionPermission hpp = (target as HostProtectionPermission);
if (hpp == null) {
ThrowInvalidPermission (target, typeof (HostProtectionPermission));
}
return hpp;
}
}
}
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