using System;

using System.Text;

using System.Collections.ObjectModel;

namespace Aga.Controls.Tree

{

	public class TreePath

	{

		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]

		public static readonly TreePath Empty = new TreePath();

		private object[] _path;

		public object[] FullPath

		{

			get { return _path; }

		}

		public object LastNode

		{

			get

			{

				if (_path.Length > 0)

					return _path[_path.Length - 1];

				else

					return null;

			}

		}

		public object FirstNode

		{

			get

			{

				if (_path.Length > 0)

					return _path[0];

				else

					return null;

			}

		}

		public TreePath()

		{

			_path = new object[0];

		}

		public TreePath(object node)

		{

			_path = new object[] { node };

		}

		public TreePath(object[] path)

		{

			_path = path;

		}

		public TreePath(TreePath parent, object node)

		{

			_path = new object[parent.FullPath.Length + 1];

			for (int i = 0; i < _path.Length - 1; i++)

				_path[i] = parent.FullPath[i];

			_path[_path.Length - 1] = node;

		}

		public bool IsEmpty()

		{

			return (_path.Length == 0);

		}

	}

}