public object ComputeFieldValue(Sitecore.ContentSearch.IIndexable indexable)
{
var indexableItem = indexable as SitecoreIndexableItem;
if (indexableItem == null)
return null;
var item = (Sitecore.Data.Items.Item)indexableItem;
if (item == null)
return null;
var latLon = item[SourceFieldName];
if (latLon == "" || latLon == "NULL")
return null;
// Convert from georss point to normal X, Y format
latLon = latLon.Replace(" ", ", ");
var spatialContext = SpatialContext.GEO;
var geohashTree = new GeohashPrefixTree(spatialContext, 10);
var strategy = new RecursivePrefixTreeStrategy(geohashTree, FieldName);
var shape = spatialContext.ReadShape(latLon);
var grid = strategy.GetGrid();
int levelForDistance = grid.GetLevelForDistance(strategy.DistErrPct);
IList<Node> list = grid.GetNodes(shape, levelForDistance, true);
return list.Select(node => node.GetTokenString());
}
public void CreateSpatialFilterAndWeight(PointRadiusCriterion geoFilter, Filter currentFilter, Weight currentWeight)
{
var spatialContext = SpatialContext.GEO;
var geohashTree = new GeohashPrefixTree(spatialContext, 10);
var strategy = new RecursivePrefixTreeStrategy(geohashTree, geoFilter.FieldName);
var point = spatialContext.MakePoint(geoFilter.Longitude, geoFilter.Latitude);
var spatialArgs = new SpatialArgs(SpatialOperation.Intersects, spatialContext.MakeCircle(point,
DistanceUtils.Dist2Degrees(geoFilter.RadiusKm, DistanceUtils.EARTH_MEAN_RADIUS_KM)));
var circle = spatialContext.MakeCircle(point,
DistanceUtils.Dist2Degrees(geoFilter.RadiusKm, DistanceUtils.EARTH_MEAN_RADIUS_KM));
var circleCells = strategy.GetGrid().GetWorldNode().GetSubCells(circle);
var luceneFilters = new List<Filter>();
if (currentFilter != null)
luceneFilters.Add(currentFilter);
var tempSpatial = strategy.MakeFilter(spatialArgs);
luceneFilters.Add(tempSpatial);
if (geoFilter.Sort != PointRadiusCriterion.SortOption.None)
{
var valueSource = strategy.MakeDistanceValueSource(point);
var funcQ = new FunctionQuery(valueSource);
// this is a bit odd... but boosting the score negatively orders results
if (geoFilter.Sort == PointRadiusCriterion.SortOption.Ascending)
{
funcQ.Boost = -1;
}
spatialWeight = funcQ.CreateWeight(this);
spatialWeight.GetSumOfSquaredWeights();
luceneFilters.Add(new QueryWrapperFilter(currentWeight.Query));
}
spatialFilter = new ChainedFilter(luceneFilters.ToArray(), 1);
}
public IEnumerable<Param> ParamsProvider()
{
var ctorArgs = new List<Param>();
SpatialContext ctx = SpatialContext.GEO;
SpatialPrefixTree grid = new GeohashPrefixTree(ctx, 12);
SpatialStrategy strategy = new RecursivePrefixTreeStrategy(grid, "recursive_geohash");
ctorArgs.Add(new Param(strategy));
grid = new QuadPrefixTree(ctx, 25);
strategy = new RecursivePrefixTreeStrategy(grid, "recursive_quad");
ctorArgs.Add(new Param(strategy));
grid = new GeohashPrefixTree(ctx, 12);
strategy = new TermQueryPrefixTreeStrategy(grid, "termquery_geohash");
ctorArgs.Add(new Param(strategy));
strategy = new PointVectorStrategy(ctx, "pointvector");
ctorArgs.Add(new Param(strategy));
return ctorArgs;
}
//@ParametersFactory
public static IList<Object[]> Parameters()
{
List<Object[]> ctorArgs = new List<object[]>();
SpatialContext ctx = SpatialContext.GEO;
SpatialPrefixTree grid;
SpatialStrategy strategy;
grid = new QuadPrefixTree(ctx, 25);
strategy = new RecursivePrefixTreeStrategy(grid, "recursive_quad");
ctorArgs.Add(new Object[] { new Param(strategy) });
grid = new GeohashPrefixTree(ctx, 12);
strategy = new TermQueryPrefixTreeStrategy(grid, "termquery_geohash");
ctorArgs.Add(new Object[] { new Param(strategy) });
strategy = new PointVectorStrategy(ctx, "pointvector");
ctorArgs.Add(new Object[] { new Param(strategy) });
strategy = new SerializedDVStrategy(ctx, "serialized");
ctorArgs.Add(new Object[] { new Param(strategy) });
return ctorArgs;
}
