[jira] [Created] (LUCENE-5804) Add makeShapeValueSource to SpatialStrategy

["David Smiley (JIRA)" <ji...@apache.org>]

David Smiley created LUCENE-5804:
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             Summary: Add makeShapeValueSource to SpatialStrategy
                 Key: LUCENE-5804
                 URL: https://issues.apache.org/jira/browse/LUCENE-5804
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/spatial
            Reporter: David Smiley


The notion of a ValueSource that yields a Shape from FunctionValues.objectVal(docId) was introduced with SerializedDVStrategy, and I rather like it.  I think the base SpatialStrategy abstraction should be amended with it.  In addition, a marker class "ShapeValueSource" that simply extends ValueSource would clarify when/where these special value sources are used with a bit of type safety.
{code:java}
  /**
   * Provides access to a Shape per document via ValueSource in which
   * {@link org.apache.lucene.queries.function.FunctionValues#objectVal(int)} returns a {@link
   * Shape}.
   */
  public ShapeValueSource makeShapeValueSource() {
    throw new UnsupportedOperationException();
  }

  //(use existing javadocs)
  public ValueSource makeDistanceValueSource(Point queryPoint, double multiplier) {
    
    return new DistanceToShapeValueSource(makeShapeValueSource(), queryPoint, multiplier, ctx);
  }
{code}

SerializedDVStrategy & BBoxStrategy would use this; PointVectorStrategy could be modified to.



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