Examples with ReciprocalFloatFunction org.apache.lucene.queries.function.valuesource.ReciprocalFloatFunction used on opensource projects

Example 1 with ReciprocalFloatFunction

use of org.apache.lucene.queries.function.valuesource.ReciprocalFloatFunction in project lucene-solr by apache.

the class TestValueSources method testReciprocal.

public void testReciprocal() throws Exception {
    ValueSource vs = new ReciprocalFloatFunction(new ConstValueSource(2f), 3, 1, 4);
    assertHits(new FunctionQuery(vs), new float[] { 0.1f, 0.1f });
    assertAllExist(vs);
    vs = new ReciprocalFloatFunction(BOGUS_FLOAT_VS, 3, 1, 4);
    assertNoneExist(vs);
}

Example 2 with ReciprocalFloatFunction

use of org.apache.lucene.queries.function.valuesource.ReciprocalFloatFunction in project lucene-solr by apache.

the class SpatialStrategy method makeRecipDistanceValueSource.

/**
   * Returns a ValueSource with values ranging from 1 to 0, depending inversely
   * on the distance from {@link #makeDistanceValueSource(org.locationtech.spatial4j.shape.Point,double)}.
   * The formula is {@code c/(d + c)} where 'd' is the distance and 'c' is
   * one tenth the distance to the farthest edge from the center. Thus the
   * scores will be 1 for indexed points at the center of the query shape and as
   * low as ~0.1 at its furthest edges.
   */
public final ValueSource makeRecipDistanceValueSource(Shape queryShape) {
    Rectangle bbox = queryShape.getBoundingBox();
    double diagonalDist = ctx.getDistCalc().distance(ctx.makePoint(bbox.getMinX(), bbox.getMinY()), bbox.getMaxX(), bbox.getMaxY());
    double distToEdge = diagonalDist * 0.5;
    //one tenth
    float c = (float) distToEdge * 0.1f;
    return new ReciprocalFloatFunction(makeDistanceValueSource(queryShape.getCenter(), 1.0), 1f, c, c);
}