--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Mapping/MapIndex.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,99 @@
+using System;
+using System.Linq;
+using BLToolkit.Common;
+using BLToolkit.Properties;
+
+namespace BLToolkit.Mapping
+{
+	public class MapIndex
+	{
+		public MapIndex(string[] names)
+		{
+			if (null == names)
+				throw new ArgumentNullException("names");
+
+			if (names.Length == 0)
+				throw new ArgumentException(Resources.MapIndex_EmptyNames, "names");
+
+			Fields = NameOrIndexParameter.FromStringArray(names);
+		}
+
+		public MapIndex(int[] indices)
+		{
+			if (null == indices)
+				throw new ArgumentNullException("indices");
+
+			if (indices.Length == 0)
+				throw new ArgumentException(Resources.MapIndex_EmptyIndices, "indices");
+
+			Fields = NameOrIndexParameter.FromIndexArray(indices);
+		}
+		
+		public MapIndex(params NameOrIndexParameter[] fields)
+		{
+			if (null == fields)
+				throw new ArgumentNullException("fields");
+
+			if (fields.Length == 0)
+				throw new ArgumentException(Resources.MapIndex_EmptyFields, "fields");
+			
+			Fields = fields;
+		}
+
+		public NameOrIndexParameter[] Fields { get; private set; }
+
+		private string _id;
+		public  string  ID
+		{
+			get { return _id ?? (_id = string.Join(".", Fields.Select(_ => _.ToString()).ToArray())); }
+		}
+
+		[CLSCompliant(false)]
+		public object GetValue(IMapDataSource source, object obj, int index)
+		{
+			if (source == null)
+				throw new ArgumentNullException("source");
+
+			var value = Fields[index].ByName?
+				source.GetValue(obj, Fields[index].Name):
+				source.GetValue(obj, Fields[index].Index);
+
+			if (value == null)
+			{
+				var objectMapper = source as ObjectMapper;
+
+				if (objectMapper != null)
+				{
+					var mm = Fields[index].ByName?
+						objectMapper[Fields[index].Name]: objectMapper[Fields[index].Index];
+
+					if (mm == null)
+						throw new MappingException(string.Format(Resources.MapIndex_BadField,
+							objectMapper.TypeAccessor.OriginalType.Name, Fields[index]));
+				}
+			}
+
+			return value;
+		}
+
+		[CLSCompliant(false)]
+		public object GetValueOrIndex(IMapDataSource source, object obj)
+		{
+			return Fields.Length == 1?
+				GetValue(source, obj, 0):
+				GetIndexValue(source, obj);
+		}
+
+		[CLSCompliant(false)]
+		public CompoundValue GetIndexValue(IMapDataSource source, object obj)
+		{
+			var values = new object[Fields.Length];
+
+			for (var i = 0; i < values.Length; i++)
+				values[i] = GetValue(source, obj, i);
+
+			return new CompoundValue(values);
+		}
+	}
+}
+