/// <summary>
/// Filter out any points outside of the queried area from the input list.
/// </summary>
/// <param name="list">List of items return by Amazon DynamoDB. It may contains points outside of the actual area queried.</param>
/// <param name="geoQueryRequest">List of items within the queried area.</param>
/// <returns></returns>
private IEnumerable <IDictionary <string, AttributeValue> > Filter(IEnumerable <IDictionary <string, AttributeValue> > list,
GeoQueryRequest geoQueryRequest)
{
var result = new List <IDictionary <String, AttributeValue> >();
S2LatLngRect?latLngRect = null;
S2LatLng? centerLatLng = null;
double radiusInMeter = 0;
if (geoQueryRequest is QueryRectangleRequest)
{
latLngRect = S2Util.GetBoundingLatLngRect(geoQueryRequest);
}
foreach (var item in list)
{
var geoJson = item[_config.GeoJsonAttributeName].S;
var geoPoint = GeoJsonMapper.GeoPointFromString(geoJson);
var latLng = S2LatLng.FromDegrees(geoPoint.lat, geoPoint.lng);
if (latLngRect != null && latLngRect.Value.Contains(latLng))
{
result.Add(item);
}
else if (centerLatLng != null && radiusInMeter > 0 &&
centerLatLng.Value.GetEarthDistance(latLng) <= radiusInMeter)
{
result.Add(item);
}
}
return(result);
}
public async Task <PutPointResult> PutPointAsync(PutPointRequest putPointRequest, CancellationToken cancellationToken = default(CancellationToken))
{
if (putPointRequest == null)
{
throw new ArgumentNullException("putPointRequest");
}
var geohash = S2Manager.GenerateGeohash(putPointRequest.FromGeoPoint);
var rangeHash = S2Manager.GenerateGeohash(putPointRequest.ToGeoPoint);
var hashKey = S2Manager.GenerateHashKey(geohash, _config.HashKeyLength);
var geoJson = GeoJsonMapper.StringFromGeoObject(putPointRequest.FromGeoPoint);
var putItemRequest = putPointRequest.PutItemRequest;
putItemRequest.TableName = _config.TableName;
var hashKeyValue = new AttributeValue
{
N = hashKey.ToString(CultureInfo.InvariantCulture)
};
putItemRequest.Item[_config.HashKeyAttributeName] = hashKeyValue;
putItemRequest.Item[_config.RangeKeyAttributeName] = new AttributeValue
{
S = rangeHash.ToString(CultureInfo.InvariantCulture)
};
var geohashValue = new AttributeValue
{
N = geohash.ToString(CultureInfo.InvariantCulture)
};
putItemRequest.Item[_config.GeohashAttributeName] = geohashValue;
var geoJsonValue = new AttributeValue
{
S = geoJson
};
putItemRequest.Item[_config.GeoJsonAttributeName] = geoJsonValue;
PutItemResponse putItemResult = await _config.DynamoDBClient.PutItemAsync(putItemRequest, cancellationToken).ConfigureAwait(false);
var putPointResult = new PutPointResult(putItemResult);
return(putPointResult);
}
