//Copyright (C) 2007 Matthew Johnson

//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 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 General Public License for more details.

//You should have received a copy of the GNU General Public License along
//with this program; if not, write to the Free Software Foundation, Inc.,
//51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
using System;
namespace SVM
{
    /// <summary>
    /// Encapsulates a node in a Problem vector, with an index and a value (for more efficient representation
    /// of sparse data.
    /// </summary>
	[Serializable]
	public class Node
	{
        private int _index;
        private double _value;

        /// <summary>
        /// Default Constructor.
        /// </summary>
        public Node()
        {
        }
        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="index">The index of the value.</param>
        /// <param name="value">The value to store.</param>
        public Node(int index, double value)
        {
            _index = index;
            _value = value;
        }

        /// <summary>
        /// Index of this Node.
        /// </summary>
        public int Index
        {
            get
            {
                return _index;
            }
            set
            {
                _index = value;
            }
        }
        /// <summary>
        /// Value at Index.
        /// </summary>
        public double Value
        {
            get
            {
                return _value;
            }
            set
            {
                _value = value;
            }
        }

        /// <summary>
        /// String representation of this Node as {index}:{value}.
        /// </summary>
        /// <returns>{index}:{value}</returns>
        public override string ToString()
        {
            return string.Format("{0}:{1}", _index, _value);
        }
	}
}