Example usage for org.apache.lucene.spatial SpatialStrategy makeRecipDistanceValueSource

Introduction

In this page you can find the example usage for org.apache.lucene.spatial SpatialStrategy makeRecipDistanceValueSource.

Prototype

public final DoubleValuesSource makeRecipDistanceValueSource(Shape queryShape) 

Source Link

Document

Returns a ValueSource with values ranging from 1 to 0, depending inversely on the distance from #makeDistanceValueSource(org.locationtech.spatial4j.shape.Point,double) .

Usage

From source file:org.eclipse.rdf4j.sail.lucene.LuceneIndex.java

License:Open Source License

@Override
protected Iterable<? extends DocumentDistance> geoQuery(final URI geoProperty, Point p, final URI units,
        double distance, String distanceVar, Var contextVar) throws MalformedQueryException, IOException {
    double degs = GeoUnits.toDegrees(distance, units);
    final String geoField = SearchFields.getPropertyField(geoProperty);
    SpatialStrategy strategy = getSpatialStrategyMapper().apply(geoField);
    final Shape boundingCircle = strategy.getSpatialContext().makeCircle(p, degs);
    Query q = strategy.makeQuery(new SpatialArgs(SpatialOperation.Intersects, boundingCircle));
    if (contextVar != null) {
        q = addContextTerm(q, (Resource) contextVar.getValue());
    }/*from  w  w w.ja va  2  s  .  c  o  m*/

    TopDocs docs = search(
            new CustomScoreQuery(q, new FunctionQuery(strategy.makeRecipDistanceValueSource(boundingCircle))));
    final boolean requireContext = (contextVar != null && !contextVar.hasValue());
    return Iterables.transform(Arrays.asList(docs.scoreDocs), new Function<ScoreDoc, DocumentDistance>() {

        @Override
        public DocumentDistance apply(ScoreDoc doc) {
            return new LuceneDocumentDistance(doc, geoField, units, boundingCircle.getCenter(), requireContext,
                    LuceneIndex.this);
        }
    });
}

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