using System.Collections.Generic;
using System.Linq;

namespace TINK.Model.Connector.Filter
{
	public static class GroupFilterFactory
	{
		/// <summary>
		/// Creates filter object.
		/// </summary>
		/// <param name="group">if value consists
		/// - list of strings entries are used to filter (intersect) with or if value is
		/// - null or an empty list null filter is applied, i.e. filtering is off.</param>
		/// <returns>Filtering object.</returns>
		/// <remarks>
		/// Tread group values of null and empty lists as marker to turn filtering off to handle COPRI responses maximal flexible.
		/// </remarks>
		public static IGroupFilter Create(IEnumerable<string> group)
		{
			return group != null && group.Count() > 0
				? (IGroupFilter)new IntersectGroupFilter(group) :
				new NullGroupFilter();
		}
	}
}