# Uses of Class
org.apache.lucene.spatial.prefix.PrefixTreeStrategy

Packages that use PrefixTreeStrategy
Package
Description
org.apache.lucene.spatial.prefix
Prefix Tree Strategy.

## Uses of PrefixTreeStrategy in org.apache.lucene.spatial.prefix

Subclasses of PrefixTreeStrategy in org.apache.lucene.spatial.prefix
Modifier and Type
Class
Description
`class`
`NumberRangePrefixTreeStrategy`
A PrefixTree based on Number/Date ranges.
`class`
`RecursivePrefixTreeStrategy`
A `PrefixTreeStrategy` which uses `AbstractVisitingPrefixTreeQuery`.
`class`
`TermQueryPrefixTreeStrategy`
A basic implementation of `PrefixTreeStrategy` using a large `TermInSetQuery` of all the cells from `SpatialPrefixTree.getTreeCellIterator(org.locationtech.spatial4j.shape.Shape, int)`.
Methods in org.apache.lucene.spatial.prefix with parameters of type PrefixTreeStrategy
Modifier and Type
Method
Description
`static HeatmapFacetCounter.Heatmap`
HeatmapFacetCounter.`calcFacets(PrefixTreeStrategy strategy, IndexReaderContext context, Bits topAcceptDocs, org.locationtech.spatial4j.shape.Shape inputShape, int facetLevel, int maxCells)`
Calculates spatial 2D facets (aggregated counts) in a grid, sometimes called a heatmap.
`static void`
PrefixTreeFacetCounter.`compute(PrefixTreeStrategy strategy, IndexReaderContext context, Bits topAcceptDocs, org.locationtech.spatial4j.shape.Shape queryShape, int facetLevel, PrefixTreeFacetCounter.FacetVisitor facetVisitor)`
Computes facets using a callback/visitor style design, allowing flexibility for the caller to determine what to do with each underlying count.
`static void`
PrefixTreeFacetCounter.`compute(PrefixTreeStrategy strategy, LeafReaderContext context, Bits acceptDocs, org.locationtech.spatial4j.shape.Shape queryShape, int facetLevel, PrefixTreeFacetCounter.FacetVisitor facetVisitor)`
Lower-level per-leaf segment method.