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From "David Smiley (JIRA)" <>
Subject [jira] [Commented] (LUCENE-4167) Remove the use of SpatialOperation
Date Wed, 27 Jun 2012 20:30:43 GMT


David Smiley commented on LUCENE-4167:

bq. I don't see the need to differentiate BBoxIntersects and Intersects. If the user wants
to find those Documents related to the bounding box of a Shape, then they can call shape.getBoundingBox()
and pass that into the Strategy. The Strategys shouldn't have to worry about the Shape (although
TwoDoubles does but that needs to be re-thought separately). The Strategys should just take
the Shape given and roll with it. Is that what you're suggesting?

The stategy shouldn't care about the bbox concept, I agree. I think the bbox capability should
be decoupled from SpatialOperation.  It's not a simple matter of the client calling queryShape.getBoundingBox()
since the expression of the query shape from client to server is a string.  So instead of
"BBoxIntersects(Circle(3,5 d=10))" I propose supporting "INTERSECTS(BBOX(Circle(3,5 d=10)))".
 The actual set of operations I want to support are [E]CQL spatial predicates:
but that perhaps deserves its own issue.
> Remove the use of SpatialOperation
> ----------------------------------
>                 Key: LUCENE-4167
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: modules/spatial
>            Reporter: Chris Male
> Looking at the code in TwoDoublesStrategy I noticed SpatialOperations.BBoxWithin vs isWithin
which confused me.  Looking over the other Strategys I see that really only isWithin and Intersects
is supported.  Only TwoDoublesStrategy supports IsDisjointTo.  The remainder of SpatialOperations
are not supported.
> I don't think we should use SpatialOperation as this stage since it is not clear what
Operations are supported by what Strategys, many Operations are not supported, and the code
for handling the Operations is usually the same.  We can spin off the code for TwoDoublesStrategy's
IsDisjointTo support into a different Strategy.

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