//
// System.Security.Policy.MembershipConditionHelper.cs
//
// Authors:
//	Ajay kumar Dwivedi (adwiv@yahoo.com)
//	Jackson Harper (jackson@ximian.com)
//	Sebastien Pouliot  <sebastien@ximian.com>
//
// (C) 2002 Jackson Harper, All rights reserved
// 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.
//

namespace System.Security.Policy {

	internal sealed class MembershipConditionHelper {

		private static readonly string XmlTag = "IMembershipCondition";


		internal static int CheckSecurityElement (SecurityElement se, string parameterName, int minimumVersion, int maximumVersion) 
		{
			if (se == null)
				throw new ArgumentNullException (parameterName);

			// Tag is case-sensitive
			if (se.Tag != XmlTag) {
				string msg = String.Format (Locale.GetText ("Invalid tag {0}, expected {1}."), se.Tag, XmlTag);
				throw new ArgumentException (msg, parameterName);
			}

			// Note: we do not care about the class attribute at 
			// this stage (in fact we don't even if the class 
			// attribute is present or not). Anyway the object has
			// already be created, with success, if we're loading it

			// we assume minimum version if no version number is supplied
			int version = minimumVersion;
			string v = se.Attribute ("version");
			if (v != null) {
				try {
					version = Int32.Parse (v);
				}
				catch (Exception e) {
					string msg = Locale.GetText ("Couldn't parse version from '{0}'.");
					msg = String.Format (msg, v);
					throw new ArgumentException (msg, parameterName, e);
				}
			}

/*			if ((version < minimumVersion) || (version > maximumVersion)) {
				string msg = Locale.GetText ("Unknown version '{0}', expected versions between ['{1}','{2}'].");
				msg = String.Format (msg, version, minimumVersion, maximumVersion);
				throw new ArgumentException (msg, parameterName);
			}*/
			return version;
		}

		// snippet moved from FileIOPermission (nickd) to be reused in all derived classes
		internal static SecurityElement Element (Type type, int version) 
		{
			SecurityElement se = new SecurityElement (XmlTag);
			se.AddAttribute ("class", type.FullName + ", " + type.Assembly.ToString ().Replace ('\"', '\''));
			se.AddAttribute ("version", version.ToString ());
			return se;
		}
	}
}