#region Copyright And Revision History

/*---------------------------------------------------------------------------

	SubArray.cs
	Copyright © 2002 Bill Menees.  All rights reserved.
	Bill@Menees.com

	Who		When		What
	-------	----------	-----------------------------------------------------
	BMenees	10.20.2002	Created.

-----------------------------------------------------------------------------*/

#endregion

using System;
using System.Text;
using System.Diagnostics;

namespace Menees.DiffUtils
{
	/// <summary>
	/// Allows 1..M access for a selected portion of an int array.
	/// </summary>
	internal sealed class SubArray<T> where T : IComparable<T>
	{
		private T[] m_arData;
		private int m_iOffset; //Stores the 0-based offset into m_arData where this subarray should start
		private int m_iLength; //Stores the length of this subarray

		public SubArray(T[] arData)
		{
			m_arData = arData;
			m_iOffset = 0;
			m_iLength = m_arData.Length;
		}

		public SubArray(SubArray<T> arData, int iOffset, int iLength)
		{
			m_arData = arData.m_arData;
			//Subtract 1 here because iOffset will be 1-based
			m_iOffset = arData.m_iOffset + iOffset - 1;
			m_iLength = iLength;
		}

		public int Length
		{
			get
			{
				return m_iLength;
			}
		}

		public T this[int iIndex]
		{
			get
			{
				//Subtract 1 because iIndex will be 1-based.
				return m_arData[m_iOffset + iIndex - 1];
			}
		}

		public int Offset
		{
			get
			{
				//Return the 0-based offset into the main int array
				return m_iOffset;
			}
		}

		public override string ToString()
		{
			int iLength = Length;
			StringBuilder B = new StringBuilder(3*iLength);
			for(int i = 0; i < iLength; i++)
			{
				B.AppendFormat("{0} ", m_arData[m_iOffset + i]);
			}

			return B.ToString();
		}
	}
}