/*
    Uiml.Net: a .Net UIML renderer (http://research.edm.uhasselt.be/kris/research/uiml.net)

	 Copyright (C) 2003  Kris Luyten (kris.luyten@uhasselt.be)
	                     Expertise Centre for Digital Media (http://edm.uhasselt.be)
								Hasselt University

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public License
	as published by the Free Software Foundation; either version 2.1
	of	the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

namespace Uiml{

	using System.Xml;

	///<summary>
	/// Holds 4 common attributes of UIML tags: id, source, how and export
	///</summary>
	public abstract class UimlAttributes{

		protected string m_identifier;
		protected string m_source;
		protected string m_how;
		protected string m_export;

		public enum HOW_VALS { Union,  Cascade,  Replace };
		public const string REPLACE = "replace";
		public const string CASCADE = "cascade";
		public const string UNION   = "union";
		
		public enum EXPORT_VALS { Hidden, Optional, Required };
		public const string HIDDEN = "hidden";
		public const string OPTIONAL = "optional";
		public const string REQUIRED = "required";

		protected void ReadAttributes(XmlNode n)
		{
			XmlAttributeCollection attr = n.Attributes;
			if(attr.GetNamedItem(HOW) != null)
				 How = attr.GetNamedItem(HOW).Value;
			if(attr.GetNamedItem(EXPORT) != null)
				 Export = attr.GetNamedItem(EXPORT).Value;
			if(attr.GetNamedItem(SOURCE) != null)
				 Source = attr.GetNamedItem(SOURCE).Value;
			if(attr.GetNamedItem(ID) != null)
				 Identifier = attr.GetNamedItem(ID).Value;
		}

		public string Identifier
		{
			get { return m_identifier;}
			set { m_identifier = value; }
		}

		public string Source
		{
			get { return m_source;}
			set { m_source = value; }
		}

		public bool SourceAvailable
		{
			get { return (m_source != null); }
		}

		public string How
		{
			get { return m_how;}
			set { m_how = value; }
		}

		public string Export
		{
			get { return m_export;}
			set { m_export = value; }
		}

		public const string ID           = "id";
		public const string SOURCE			= "source";
		public const string HOW				= "how";
		public const string EXPORT			= "export";

	}
}