using System;
using System.Collections.Generic;
using ln.objects.catalog;

namespace ln.types.odb.ng.index
{
    public abstract class Index
    {
        public string IndexName { get; protected set; }
		public Path IndexPath { get; protected set; }

		protected Index()
        {
        }
        protected Index(Path indexPath)
            :this()
        {
			IndexPath = indexPath;
			IndexName = IndexPath.Complete;
        }

		public virtual void Replace(Guid documentID, ODBEntity value) {
			Remove(documentID);
			Add(documentID, value);
		}
		public abstract void Add(Guid documentID, ODBEntity value);
		public abstract void Remove(Guid documentID);

        public abstract IEnumerable<Guid> GetDocumentIDs(Predicate<ODBEntity> predicate);

		public abstract bool LoadIndex(string basePath, long lastCloseTimestamp);
		public abstract bool SaveIndex(string basePath, long lastCloseTimestamp);
	}
}