# Package org.apache.lucene.spatial.prefix

Prefix Tree Strategy.

See: Description

- Class Summary
  Class | Description
  --- | ---
  AbstractPrefixTreeQuery | Base class for Lucene Queries on SpatialPrefixTree fields.
  AbstractVisitingPrefixTreeQuery | Traverses a `SpatialPrefixTree` indexed field, using the template and visitor design patterns for subclasses to guide the traversal and collect matching documents.
  AbstractVisitingPrefixTreeQuery.VNode | A visitor node/cell found via the query shape for `AbstractVisitingPrefixTreeQuery.VisitorTemplate`.
  BytesRefIteratorTokenStream | A TokenStream used internally by `PrefixTreeStrategy`.
  CellToBytesRefIterator | A reset'able `BytesRefIterator` wrapper around an `Iterator` of `Cell`s.
  ContainsPrefixTreeQuery | Finds docs where its indexed shape `CONTAINS` the query shape.
  HeatmapFacetCounter | Computes spatial facets in two dimensions as a grid of numbers.
  HeatmapFacetCounter.Heatmap | Response structure
  IntersectsPrefixTreeQuery | A Query matching documents that have an `SpatialRelation.INTERSECTS` (i.e.
  NumberRangePrefixTreeStrategy | A PrefixTree based on Number/Date ranges.
  NumberRangePrefixTreeStrategy.Facets | Facet response information
  NumberRangePrefixTreeStrategy.Facets.FacetParentVal | Holds a block of detailLevel counts aggregated to their parent level.
  PointPrefixTreeFieldCacheProvider | Implementation of `ShapeFieldCacheProvider` designed for `PrefixTreeStrategy`s that index points (AND ONLY POINTS!).
  PrefixTreeFacetCounter | Computes facets on cells for `PrefixTreeStrategy`.
  PrefixTreeFacetCounter.FacetVisitor | A callback/visitor of facet counts.
  PrefixTreeStrategy | An abstract SpatialStrategy based on `SpatialPrefixTree`.
  RecursivePrefixTreeStrategy | A `PrefixTreeStrategy` which uses `AbstractVisitingPrefixTreeQuery`.
  TermQueryPrefixTreeStrategy | A basic implementation of `PrefixTreeStrategy` using a large `TermInSetQuery` of all the cells from `SpatialPrefixTree.getTreeCellIterator(org.locationtech.spatial4j.shape.Shape, int)`.
  WithinPrefixTreeQuery | Finds docs where its indexed shape is `WITHIN` the query shape.

## Package org.apache.lucene.spatial.prefix Description

Prefix Tree Strategy.

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