public IEnumerable <IFieldable> SpatialGenerate(string fieldName, string shapeWKT,
SpatialSearchStrategy spatialSearchStrategy = SpatialSearchStrategy.GeohashPrefixTree,
int maxTreeLevel = 0, double distanceErrorPct = 0.025)
{
if (string.IsNullOrEmpty(shapeWKT))
{
return(Enumerable.Empty <IFieldable>());
}
if (maxTreeLevel == 0)
{
switch (spatialSearchStrategy)
{
case SpatialSearchStrategy.GeohashPrefixTree:
maxTreeLevel = 9; // about 2 meters, should be good enough (see: http://unterbahn.com/2009/11/metric-dimensions-of-geohash-partitions-at-the-equator/)
break;
case SpatialSearchStrategy.QuadPrefixTree:
maxTreeLevel = 25; // about 1 meter, should be good enough
break;
default:
throw new ArgumentOutOfRangeException("spatialSearchStrategy");
}
}
var strategy = SpatialStrategies.GetOrAdd(fieldName, s => SpatialIndex.CreateStrategy(fieldName, spatialSearchStrategy, maxTreeLevel));
var shape = SpatialIndex.ReadShape(shapeWKT);
return(strategy.CreateIndexableFields(shape)
.Concat(new[] { new Field(Constants.SpatialShapeFieldName, SpatialIndex.WriteShape(shape), Field.Store.YES, Field.Index.NO), }));
}
public SpatialStrategy GetStrategyForField(string fieldName)
{
return(SpatialStrategies.GetOrAdd(fieldName, s =>
{
if (SpatialStrategies.Count > 1024)
{
throw new InvalidOperationException("The number of spatial fields in an index is limited ot 1,024");
}
return SpatialIndex.CreateStrategy(fieldName, SpatialSearchStrategy.GeohashPrefixTree, GeohashPrefixTree.GetMaxLevelsPossible());
}));
}
public IEnumerable <IFieldable> SpatialGenerate(string fieldName, double?lat, double?lng)
{
var strategy = SpatialStrategies.GetOrAdd(fieldName, s => SpatialIndex.CreateStrategy(fieldName, SpatialSearchStrategy.GeohashPrefixTree,
GeohashPrefixTree.GetMaxLevelsPossible()));
// ReSharper disable CSharpWarnings::CS0612
Shape shape = SpatialIndex.Context.MakePoint(lng ?? 0, lat ?? 0);
return(strategy.CreateIndexableFields(shape)
.Concat(new[] { new Field(Constants.SpatialShapeFieldName, SpatialIndex.ShapeReadWriter.WriteShape(shape), Field.Store.YES, Field.Index.NO), }));
// ReSharper restore CSharpWarnings::CS0612
}
public IEnumerable <IFieldable> SpatialGenerate(string fieldName, string shapeWKT,
SpatialSearchStrategy spatialSearchStrategy = SpatialSearchStrategy.GeohashPrefixTree,
int maxTreeLevel = 0, double distanceErrorPct = 0.025)
{
if (maxTreeLevel == 0)
{
maxTreeLevel = GeohashPrefixTree.GetMaxLevelsPossible();
}
var strategy = SpatialStrategies.GetOrAdd(fieldName, s => SpatialIndex.CreateStrategy(fieldName, spatialSearchStrategy, maxTreeLevel));
var shape = SpatialIndex.ShapeReadWriter.ReadShape(shapeWKT);
return(strategy.CreateIndexableFields(shape)
.Concat(new[] { new Field(Constants.SpatialShapeFieldName, SpatialIndex.ShapeReadWriter.WriteShape(shape), Field.Store.YES, Field.Index.NO), }));
}
