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//
// System.Security.Policy.PolicyStatement.cs
//
// Authors:
// Dan Lewis (dihlewis@yahoo.co.uk)
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2002
// Copyright (C) 2004-2005 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.Runtime.InteropServices;
using System.Security.Permissions;
namespace System.Security.Policy {
[Serializable]
[ComVisible (true)]
public sealed class PolicyStatement : ISecurityEncodable, ISecurityPolicyEncodable {
private PermissionSet perms;
private PolicyStatementAttribute attrs;
public PolicyStatement (PermissionSet permSet) :
this (permSet, PolicyStatementAttribute.Nothing)
{
}
public PolicyStatement (PermissionSet permSet, PolicyStatementAttribute attributes)
{
if (permSet != null) {
this.perms = permSet.Copy ();
this.perms.SetReadOnly (true);
}
this.attrs = attributes;
}
public PermissionSet PermissionSet {
get {
if (perms == null) {
perms = new PermissionSet (PermissionState.None);
perms.SetReadOnly (true);
}
return perms;
}
set { perms = value; }
}
public PolicyStatementAttribute Attributes {
get { return attrs; }
set {
// note: yes it's a flag but all possible values have a corresponding name
switch (value) {
case PolicyStatementAttribute.Nothing:
case PolicyStatementAttribute.Exclusive:
case PolicyStatementAttribute.LevelFinal:
case PolicyStatementAttribute.All:
attrs = value;
break;
default:
string msg = Locale.GetText ("Invalid value for {0}.");
throw new ArgumentException (String.Format (msg, "PolicyStatementAttribute"));
}
}
}
public string AttributeString {
get {
switch (attrs) {
case PolicyStatementAttribute.Exclusive:
return "Exclusive";
case PolicyStatementAttribute.LevelFinal:
return "LevelFinal";
case PolicyStatementAttribute.All:
return "Exclusive LevelFinal";
default:
return String.Empty;
}
}
}
public PolicyStatement Copy ()
{
return new PolicyStatement (perms, attrs);
}
// ISecurityEncodable
public void FromXml (SecurityElement et)
{
FromXml (et, null);
}
public void FromXml (SecurityElement et, PolicyLevel level)
{
if (et == null)
throw new ArgumentNullException ("et");
if (et.Tag != "PolicyStatement")
throw new ArgumentException (Locale.GetText ("Invalid tag."));
string attributes = et.Attribute ("Attributes");
if (attributes != null) {
attrs = (PolicyStatementAttribute) Enum.Parse (
typeof (PolicyStatementAttribute), attributes);
}
SecurityElement permissions = et.SearchForChildByTag ("PermissionSet");
PermissionSet.FromXml (permissions);
}
public SecurityElement ToXml ()
{
return ToXml (null);
}
public SecurityElement ToXml (PolicyLevel level)
{
SecurityElement element = new SecurityElement ("PolicyStatement");
element.AddAttribute ("version", "1");
if (attrs != PolicyStatementAttribute.Nothing)
element.AddAttribute ("Attributes", attrs.ToString ());
element.AddChild (PermissionSet.ToXml ());
return element;
}
[ComVisible (false)]
public override bool Equals (object obj)
{
if (obj == null)
return false;
PolicyStatement ps = (obj as PolicyStatement);
if (ps == null)
return false;
return (PermissionSet.Equals (obj) && (attrs == ps.attrs));
}
[ComVisible (false)]
public override int GetHashCode ()
{
// return same hash code if two PolicyStatement are equals
return (PermissionSet.GetHashCode () ^ (int) attrs);
}
internal static PolicyStatement Empty ()
{
return new PolicyStatement (new PermissionSet (PermissionState.None));
}
}
}
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