using System;
namespace hwo.bitworks
{
	public class ShiftLeft : MultipleBitsSource
	{
		int n;

		public ShiftLeft(LogicBase[] sources,int n)
			:base(sources)
		{
			this.n = n;
		}

		public override bool bitValue(int bit)
		{
			if (bit < this.n){
				return false;
			} else if (bit < getBits()){
				return sources[bit - this.n].value();
			}
			throw new IndexOutOfRangeException(String.Format("ShiftLeft supplies {0} bits, but bit #{1} requested",getBits(),bit));
		}

		public override identity.BitIdentity getBitIdentity(int bit)
		{
			if (bit < this.n){
				return Constants.ZERO.identity();
			} else if (bit < getBits()){
				return sources[bit - this.n].identity();
			}
			throw new IndexOutOfRangeException(String.Format("ShiftLeft supplies {0} bits, but bit #{1} requested",getBits(),bit));
		}

	}
}