Hi Craig,
As always thanks for your nice reply.
I understood the problem but not the solution yet. The fact is I have
points, lines, and polygons as geometries.
Four main queries which I have are as follows:
1- given coordinates of an arbitrary point (i.e., not a node in the graph)
find the polygon node which enclose it
2- given a point node find all other nodes which are withing distance r of
it.
3- given a point node find all k nearest neighbors point node of it
4- given two polygon determines if they intersect and perhaps find the size
of intersection
I defined my layer as follows (I tried with WKB too):
EditableLayer runningLayer = (EditableLayer)
graphDBSpatial.getOrCreateLayer(layerName,
WKTGeometryEncoder.class,
EditableLayerImpl.class,
"x:y:z");
Then I create my nodes as follows:
// point node
Point p = runningLayer.getGeometryFactory().createPoint(coord);
SpatialDatabaseRecord v = runningLayer.add(p);
// edge node
LineString lineString =
runningLayer.getGeometryFactory().createLineString(coord);
SpatialDatabaseRecord e = runningLayer.add(lineString);
// polygon node
Polygon poly =
runningLayer.getGeometryFactory().createPolygon(coordinates);
SpatialDatabaseRecord tc = runningLayer.add(poly);
Based on what you said I should have a separate layer for point, right? If
the answer is yes, then while querying I should load two layers
based on which of the queries above is requested (WKT layer for queries 1
and 4 and Point layer for 2 and 3), is that correct ?
Cheers,
Alireza
On Monday, August 10, 2015 at 11:09:21 AM UTC+2, Craig Taverner wrote:
>
> Hi Alireza,
>
> I wrote some test code using your layer creation and neighbour search code
> that you pasted, and it works fine. So what I think has happened is that
> you have somehow added nodes with a different layer config to the same
> index that you are now using for WKB. Perhaps the nodes used to be points
> in a simple point layer, and now you changed to a WKB layer, it is no
> longer compatible.
>
> I can make a few suggestions:
>
> - Make sure your nodes were added using the layer.add(Geometry)
> method. If you used layer.add(Node) then it is your responsibility to make
> sure the node conforms to the same layer config that you are planning to
> use. For example, do not add a simple point node (with lat/lon attributes)
> to a WKT layer, or you are likely to create this kind of issue.
> - Since you are working with points, can I suggest you not use the WKB
> layer config, but rather use the SimplePointLayer, as created by
> SpatialGraphDatabase.createSimplePointLayer(name)
> or SpatialGraphDatabase.createSimplePointLayer(name,xProp,yProp)
>
> Regards, Craig
>
> On Sun, Aug 9, 2015 at 12:02 AM, Alireza Rezaei Mahdiraji <
> [email protected] <javascript:>> wrote:
>
>>
>> Let me ask you a design kind of question: the nodes in my graph could
>> have various geometry: point, line, or polygon.
>> I used the following layer definition (but I am not sure that is the best
>> way to do it)"
>>
>> EditableLayer runningLayer = (EditableLayer)
>> graphDBSpatial.getOrCreateLayer(layerName,
>> WKBGeometryEncoder.class,
>> EditableLayerImpl.class,
>> geomEncoderConfig);
>>
>> I appreciate if you comment on this.
>>
>> Alireza
>>
>>
>> On Saturday, August 8, 2015 at 11:48:24 PM UTC+2, Michael Hunger wrote:
>>>
>>> It seems you created the layer with a WKB (well known binary)
>>> representation config
>>>
>>> but now your location properties are not decodable as WKB because they
>>> are double's ?
>>>
>>> Michael
>>>
>>> Perhaps you can share a test that reproduces the issue?
>>>
>>> Am 08.08.2015 um 23:26 schrieb Alireza Rezaei Mahdiraji <
>>> [email protected]>:
>>>
>>>
>>> Here are the stacks for the two cases (very similar):
>>>
>>> Exception in thread "main" java.lang.ClassCastException:
>>> java.lang.Double cannot be cast to [B
>>> at
>>> org.neo4j.gis.spatial.WKBGeometryEncoder.decodeGeometry(WKBGeometryEncoder.java:41)
>>> at
>>> org.neo4j.gis.spatial.filter.SearchIntersectWindow.onEnvelopeIntersection(SearchIntersectWindow.java:48)
>>> at
>>> org.neo4j.gis.spatial.rtree.filter.AbstractSearchEnvelopeIntersection.geometryMatches(AbstractSearchEnvelopeIntersection.java:45)
>>> at
>>> org.neo4j.gis.spatial.rtree.RTreeIndex$SearchEvaluator.checkPosition(RTreeIndex.java:286)
>>> at
>>> org.neo4j.gis.spatial.rtree.RTreeIndex$SearchEvaluator.isStopNode(RTreeIndex.java:299)
>>> at
>>> org.neo4j.kernel.impl.traversal.OldTraverserWrapper$Pruner.evaluate(OldTraverserWrapper.java:260)
>>> at
>>> org.neo4j.graphdb.traversal.Evaluator$AsPathEvaluator.evaluate(Evaluator.java:69)
>>> at
>>> org.neo4j.kernel.impl.traversal.MultiEvaluator.evaluate(MultiEvaluator.java:62)
>>> at
>>> org.neo4j.kernel.impl.traversal.MonoDirectionalTraverserIterator.evaluate(MonoDirectionalTraverserIterator.java:61)
>>> at
>>> org.neo4j.kernel.impl.traversal.TraversalBranchImpl.evaluate(TraversalBranchImpl.java:125)
>>> at
>>> org.neo4j.kernel.impl.traversal.TraversalBranchImpl.initialize(TraversalBranchImpl.java:130)
>>> at
>>> org.neo4j.kernel.impl.traversal.TraversalBranchImpl.next(TraversalBranchImpl.java:151)
>>> at
>>> org.neo4j.kernel.impl.traversal.TraversalBranchWithState.next(TraversalBranchWithState.java:32)
>>> at
>>> org.neo4j.kernel.impl.traversal.StartNodeTraversalBranch.next(StartNodeTraversalBranch.java:50)
>>> at
>>> org.neo4j.graphdb.traversal.PreorderDepthFirstSelector.next(PreorderDepthFirstSelector.java:49)
>>> at
>>> org.neo4j.kernel.impl.traversal.MonoDirectionalTraverserIterator.fetchNextOrNull(MonoDirectionalTraverserIterator.java:70)
>>> at
>>> org.neo4j.kernel.impl.traversal.MonoDirectionalTraverserIterator.fetchNextOrNull(MonoDirectionalTraverserIterator.java:36)
>>> at
>>> org.neo4j.helpers.collection.PrefetchingIterator.peek(PrefetchingIterator.java:60)
>>> at
>>> org.neo4j.helpers.collection.PrefetchingIterator.hasNext(PrefetchingIterator.java:46)
>>> at
>>> org.neo4j.helpers.collection.PrefetchingIterator.next(PrefetchingIterator.java:75)
>>> at
>>> org.neo4j.kernel.impl.traversal.OldTraverserWrapper$TraverserImpl.next(OldTraverserWrapper.java:86)
>>> at
>>> org.neo4j.kernel.impl.traversal.OldTraverserWrapper$TraverserImpl.next(OldTraverserWrapper.java:47)
>>> at
>>> org.neo4j.gis.spatial.filter.SearchRecords.next(SearchRecords.java:53)
>>> at
>>> org.neo4j.gis.spatial.filter.SearchRecords.next(SearchRecords.java:29)
>>> at
>>> org.neo4j.gis.spatial.pipes.GeoPipeline$1.next(GeoPipeline.java:134)
>>> at
>>> org.neo4j.gis.spatial.pipes.GeoPipeline$1.next(GeoPipeline.java:126)
>>> at
>>> org.neo4j.gis.spatial.pipes.impl.LastElementIterator.next(LastElementIterator.java:19)
>>> at
>>> org.neo4j.gis.spatial.pipes.impl.IdentityPipe.processNextStart(IdentityPipe.java:18)
>>> at
>>> org.neo4j.gis.spatial.pipes.impl.AbstractPipe.next(AbstractPipe.java:72)
>>> at
>>> org.neo4j.gis.spatial.pipes.AbstractGeoPipe.processNextStart(AbstractGeoPipe.java:49)
>>> at
>>> org.neo4j.gis.spatial.pipes.AbstractGeoPipe.processNextStart(AbstractGeoPipe.java:31)
>>> at
>>> org.neo4j.gis.spatial.pipes.impl.AbstractPipe.next(AbstractPipe.java:72)
>>> at org.neo4j.gis.spatial.pipes.impl.Pipeline.next(Pipeline.java:113)
>>> at
>>> org.neo4j.gis.spatial.pipes.GeoPipeline.toNodeList(GeoPipeline.java:1015)
>>>
>>>
>>> Exception in thread "main" java.lang.ClassCastException:
>>> java.lang.Double cannot be cast to [B
>>> at
>>> org.neo4j.gis.spatial.WKBGeometryEncoder.decodeGeometry(WKBGeometryEncoder.java:41)
>>> at
>>> org.neo4j.gis.spatial.filter.SearchIntersectWindow.onEnvelopeIntersection(SearchIntersectWindow.java:48)
>>> at
>>> org.neo4j.gis.spatial.rtree.filter.AbstractSearchEnvelopeIntersection.geometryMatches(AbstractSearchEnvelopeIntersection.java:45)
>>> at
>>> org.neo4j.gis.spatial.rtree.RTreeIndex$SearchEvaluator.checkPosition(RTreeIndex.java:286)
>>> at
>>> org.neo4j.gis.spatial.rtree.RTreeIndex$SearchEvaluator.isStopNode(RTreeIndex.java:299)
>>> at
>>> org.neo4j.kernel.impl.traversal.OldTraverserWrapper$Pruner.evaluate(OldTraverserWrapper.java:260)
>>> at
>>> org.neo4j.graphdb.traversal.Evaluator$AsPathEvaluator.evaluate(Evaluator.java:69)
>>> at
>>> org.neo4j.kernel.impl.traversal.MultiEvaluator.evaluate(MultiEvaluator.java:62)
>>> at
>>> org.neo4j.kernel.impl.traversal.MonoDirectionalTraverserIterator.evaluate(MonoDirectionalTraverserIterator.ja
>>>
>>> ...
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