Strabon

changeset 1413:97064bbd8442

buffer in meters in SELECT clauses containing only constants is not supported yet (TODO), but we log a corresponding message and we do the computation in degrees :)
author Babis Nikolaou <charnik@di.uoa.gr>
date Mon Sep 22 13:34:35 2014 +0300 (2014-09-22)
parents 8dc244d8f18a
children eb28e195755a
files generaldb/src/main/java/org/openrdf/sail/generaldb/evaluation/GeneralDBEvaluation.java
line diff
     1.1 --- a/generaldb/src/main/java/org/openrdf/sail/generaldb/evaluation/GeneralDBEvaluation.java	Mon Sep 22 13:12:18 2014 +0300
     1.2 +++ b/generaldb/src/main/java/org/openrdf/sail/generaldb/evaluation/GeneralDBEvaluation.java	Mon Sep 22 13:34:35 2014 +0300
     1.3 @@ -56,6 +56,7 @@
     1.4  import org.openrdf.query.algebra.evaluation.function.spatial.geosparql.property.GeoSparqlGetSRIDFunc;
     1.5  import org.openrdf.query.algebra.evaluation.function.spatial.postgis.construct.Centroid;
     1.6  import org.openrdf.query.algebra.evaluation.function.spatial.stsparql.construct.BoundaryFunc;
     1.7 +import org.openrdf.query.algebra.evaluation.function.spatial.stsparql.construct.BufferFunc;
     1.8  import org.openrdf.query.algebra.evaluation.function.spatial.stsparql.metric.AreaFunc;
     1.9  import org.openrdf.query.algebra.evaluation.function.spatial.stsparql.metric.DistanceFunc;
    1.10  import org.openrdf.query.algebra.evaluation.function.spatial.stsparql.property.AsGMLFunc;
    1.11 @@ -136,6 +137,7 @@
    1.12  import com.vividsolutions.jts.io.ParseException;
    1.13  
    1.14  import eu.earthobservatory.constants.GeoConstants;
    1.15 +import eu.earthobservatory.constants.OGCConstants;
    1.16  
    1.17  /**
    1.18   * Extends the default strategy by accepting {@link GeneralDBSelectQuery} and evaluating
    1.19 @@ -298,15 +300,23 @@
    1.20  		// evaluated second argument of function (if any)
    1.21  		Value rightResult = null;
    1.22  
    1.23 +		// evaluated third argument of function (if any)
    1.24 +		Value thirdResult = null;
    1.25 +				
    1.26  		// evaluate first argument
    1.27  		leftResult = evaluate(left, bindings);
    1.28  		
    1.29 -		// function call with 2 arguments, evaluate the second one now
    1.30 +		// function call with 2 or more arguments, evaluate the second one now
    1.31  		// see distance function as example
    1.32 -		if ( fc.getArgs().size() == 2 )
    1.33 +		if ( fc.getArgs().size() > 2 )
    1.34  		{
    1.35  			ValueExpr right = fc.getArgs().get(1);
    1.36  			rightResult = evaluate(right, bindings);
    1.37 +			
    1.38 +			if (fc.getArgs().size() == 3) {
    1.39 +				ValueExpr third = fc.getArgs().get(2);
    1.40 +				thirdResult = evaluate(third, bindings);
    1.41 +			}
    1.42  		}
    1.43  
    1.44  		// having evaluated the arguments of the function, evaluate the function
    1.45 @@ -343,7 +353,7 @@
    1.46  			// SPATIAL CONSTRUCT FUNCTIONS
    1.47  			//
    1.48  			else if (function instanceof SpatialConstructFunc) {
    1.49 -				return spatialConstructPicker(function, leftResult, rightResult);
    1.50 +				return spatialConstructPicker(function, leftResult, rightResult, thirdResult);
    1.51  			}
    1.52  			
    1.53  			//
    1.54 @@ -487,7 +497,7 @@
    1.55  		}
    1.56  	}
    1.57  
    1.58 -	public StrabonPolyhedron spatialConstructPicker(Function function, Value left, Value right) throws Exception
    1.59 +	public StrabonPolyhedron spatialConstructPicker(Function function, Value left, Value right, Value thirdResult) throws Exception
    1.60  	{
    1.61  		StrabonPolyhedron leftArg = getValueAsStrabonPolyhedron(left);
    1.62  		if(function.getURI().equals(GeoConstants.stSPARQLunion))
    1.63 @@ -495,19 +505,24 @@
    1.64  			StrabonPolyhedron rightArg = ((GeneralDBPolyhedron) right).getPolyhedron();
    1.65  			return StrabonPolyhedron.union(leftArg, rightArg);
    1.66  		}
    1.67 -		else if(function.getURI().equals(GeoConstants.stSPARQLbuffer))
    1.68 -		{
    1.69 +		else if (function instanceof BufferFunc) {
    1.70 +			// TODO implement computation of the buffer in meters
    1.71 +			// you'll get the type (degrees/meter) from the thirdResult, which
    1.72 +			// would be a URI.
    1.73 +			if (OGCConstants.OGCmetre.equals(thirdResult.stringValue())) {
    1.74 +				logger.info("[GeneraDBEvaluation] Computation of {} will be done in degrees.", function.getURI());
    1.75 +			}
    1.76 +			
    1.77  			if(right instanceof LiteralImpl)
    1.78  			{
    1.79  				LiteralImpl radius = (LiteralImpl) right;
    1.80 -				return StrabonPolyhedron.buffer(leftArg,radius.doubleValue());
    1.81 +				return StrabonPolyhedron.buffer(leftArg, radius.doubleValue());
    1.82  			}
    1.83 -			else if(right instanceof RdbmsLiteral)
    1.84 +			else if (right instanceof RdbmsLiteral)
    1.85  			{
    1.86  				RdbmsLiteral radius = (RdbmsLiteral) right;
    1.87 -				return StrabonPolyhedron.buffer(leftArg,radius.doubleValue());
    1.88 +				return StrabonPolyhedron.buffer(leftArg, radius.doubleValue());
    1.89  			}
    1.90 -
    1.91  		}
    1.92  		else if(function.getURI().equals(GeoConstants.stSPARQLtransform))
    1.93  		{
    1.94 @@ -537,6 +552,7 @@
    1.95  		else if(function instanceof BoundaryFunc)
    1.96  		{
    1.97  			return StrabonPolyhedron.boundary(leftArg);
    1.98 +			
    1.99  		}
   1.100  		else if(function.getURI().equals(GeoConstants.stSPARQLintersection))
   1.101  		{
   1.102 @@ -556,7 +572,7 @@
   1.103  		} else if (function instanceof Centroid) {
   1.104  			return leftArg.getCentroid();
   1.105  			
   1.106 -		} //else if (function instanceof MakeLine) {
   1.107 +		} //else if (function instanceof MakeLine) { // TODO add
   1.108  		//	return null;
   1.109  		//}
   1.110