Class PrefixTreeFacetCounter
PrefixTreeStrategy.
NOTE: If for a given document and a given field using RecursivePrefixTreeStrategy multiple values are indexed (i.e.
multi-valued) and at least one of them is a non-point, then there is a possibility of
double-counting the document in the facet results. Since each shape is independently turned into
grid cells at a resolution chosen by the shape's size, it's possible they will be indexed at
different resolutions. This means the document could be present in BOTH the postings for a cell
in both its prefix and leaf variants. To avoid this, use a single valued field with a ShapeCollection (or WKT equivalent). Or calculate a suitable
level/distErr to index both and call PrefixTreeStrategy.createIndexableFields(org.locationtech.spatial4j.shape.Shape, int) with the same value for all shapes for a given document/field.
- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic classA callback/visitor of facet counts. -
Method Summary
Modifier and TypeMethodDescriptionstatic voidcompute(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 voidcompute(PrefixTreeStrategy strategy, LeafReaderContext context, Bits acceptDocs, org.locationtech.spatial4j.shape.Shape queryShape, int facetLevel, PrefixTreeFacetCounter.FacetVisitor facetVisitor) Lower-level per-leaf segment method.
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Method Details
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compute
public static void compute(PrefixTreeStrategy strategy, IndexReaderContext context, Bits topAcceptDocs, org.locationtech.spatial4j.shape.Shape queryShape, int facetLevel, PrefixTreeFacetCounter.FacetVisitor facetVisitor) throws IOException Computes facets using a callback/visitor style design, allowing flexibility for the caller to determine what to do with each underlying count.- Parameters:
strategy- the prefix tree strategy (contains the field reference, grid, max levels)context- the IndexReader's contexttopAcceptDocs- a Bits to limit counted docs. If null, live docs are counted.queryShape- the shape to limit the range of facet counts tofacetLevel- the maximum depth (detail) of faceted cellsfacetVisitor- the visitor/callback to receive the counts- Throws:
IOException
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compute
public static void compute(PrefixTreeStrategy strategy, LeafReaderContext context, Bits acceptDocs, org.locationtech.spatial4j.shape.Shape queryShape, int facetLevel, PrefixTreeFacetCounter.FacetVisitor facetVisitor) throws IOException Lower-level per-leaf segment method.- Throws:
IOException
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