/// <summary>
        /// Method is looking for an existing parcel boundary point with the same coordinates as point parameter
        /// </summary>
        /// <param name="existingBuildingBPsList">list of existing ParcelBoundaryPoint objects from DB</param>
        /// <param name="existingBuildingBPs">hashmap of existing ParcelBoundaryPoint objects from DB - hash points for quicker search</param>
        /// <param name="point">Point to find</param>
        /// <param name="pointId">point counter for new points</param>
        /// <param name="currentLine">ParcelBoundaryLine object which contains this point</param>
        /// <param name="cadastreZoneId">Cadastre Zone ID</param>
        /// <returns>BuildingBoundaryPointId or -1 in case of an error</returns>
        private long CheckIfBoundaryPointExists(List<PBoundaryPoint> existingParcelBPsList, Dictionary<int, List<PBoundaryPoint>> existingParcelBPs, IPoint point, long pointId, PBoundaryLine currentLine, long cadastreZoneId)
        {
            int pointHash = point.GetHashCode();
            // try to find point by hash
            List<PBoundaryPoint> pointsFoundList = existingParcelBPs.ContainsKey(pointHash) ? existingParcelBPs[pointHash] : null;
            PBoundaryPoint currentPoint = null;
            // if found more than one, do spatial filtering in found list
            if (pointsFoundList != null && pointsFoundList.Count > 1)
            {
                pointsFoundList = pointsFoundList.Where(b => b.geometry.EqualsTopologically(point)).ToList();
            }
            // will this ever return something???
            /*else if (pointsFoundList == null || pointsFoundList.Count == 0)
            {
                pointsFoundList = existingParcelBPsList.Where(b => b.geometry.EqualsTopologically(point)).ToList();
            }*/

            // if point not found by hash or founded point is not topologically identical to searched point, create a new one
            if (pointsFoundList == null || pointsFoundList.Count == 0 || !pointsFoundList[0].geometry.EqualsTopologically(point))
            {
                /*if (pointsFoundList != null && pointsFoundList.Count > 0  && !pointsFoundList[0].geometry.EqualsTopologically(point))
                {
                    Debug.WriteLine(point.AsText());
                    Debug.WriteLine(pointsFoundList[0].geometry.AsText());
                }*/
                // point doesn't exist, create a new one
                IGeometry newPoint = (IGeometry)point.Clone();
                currentPoint = new PBoundaryPoint()
                {
                    parcelBoundaryPointId = pointId,
                    geometry = newPoint,
                    geometryArray = SqlGeometry.STGeomFromText(new System.Data.SqlTypes.SqlChars(newPoint.AsText()), srid).STAsBinary().Value,
                    hash = newPoint.GetHashCode(),
                    cadastreZoneId = cadastreZoneId,
                    modified = true
                };
                existingParcelBPsList.Add(currentPoint);

                // new hash, create a new list with this point
                if (pointsFoundList == null || pointsFoundList.Count == 0)
                {
                    List<PBoundaryPoint> list = new List<PBoundaryPoint>();
                    list.Add(currentPoint);
                    existingParcelBPs.Add(currentPoint.hash, list);
                }
                // existing hash, add point to list with this hash
                else
                {
                    existingParcelBPs[currentPoint.hash].Add(currentPoint);
                }
            }
            // single point has been found and it's topologically identical to searched point
            else
            {
                currentPoint = pointsFoundList[0];
                pointId = currentPoint.parcelBoundaryPointId;
            }

            /*if (pointsFoundList == null || pointsFoundList.Count == 0)
            {
                // point doesn't exist, create a new one
                IGeometry newPoint = (IGeometry)point.Clone();
                currentPoint = new PBoundaryPoint()
                {
                    parcelBoundaryPointId = pointId,
                    geometry = newPoint,
                    geometryArray = SqlGeometry.STGeomFromText(new System.Data.SqlTypes.SqlChars(newPoint.AsText()), srid).STAsBinary().Value,
                    hash = newPoint.GetHashCode(),
                    cadastreZoneId = cadastreZoneId,
                    modified = true
                };
                existingParcelBPsList.Add(currentPoint);
                List<PBoundaryPoint> list = new List<PBoundaryPoint>();
                list.Add(currentPoint);
                existingParcelBPs.Add(currentPoint.hash, list);
            }
            else
            {
                currentPoint = pointsFoundList[0];
                pointId = currentPoint.parcelBoundaryPointId;
            }*/

            // update parcelBoundaryPoint references
            if (currentLine != null)
            {
                if (currentLine.firstBoundaryPointId == null && (currentLine.secondBoundaryPointId == null || currentLine.secondBoundaryPointId != pointId))
                {
                    currentLine.firstBoundaryPointId = pointId;
                    currentLine.modified = true;
                }
                else if (currentLine.secondBoundaryPointId == null && (currentLine.firstBoundaryPointId == null || currentLine.firstBoundaryPointId != pointId))
                {
                    currentLine.secondBoundaryPointId = pointId;
                    currentLine.modified = true;
                }
                else if (currentLine.firstBoundaryPointId != pointId && currentLine.secondBoundaryPointId != pointId)
                {
                    log.Warn("BoundaryLine has both parcelBoundaryPointIds already assigned. ParcelBoundaryLineId=" + currentLine.parcelBoundaryLineId + ", " + currentLine.geometry.ToString());
                    return -1;
                }
            }
            return pointId;
        }