1.1 --- a/generaldb/src/main/java/org/openrdf/sail/generaldb/evaluation/GeneralDBEvaluation.java	Mon Apr 15 18:39:56 2013 +0300
     1.2 +++ b/generaldb/src/main/java/org/openrdf/sail/generaldb/evaluation/GeneralDBEvaluation.java	Fri Apr 26 19:48:06 2013 +0300
     1.3 @@ -92,6 +92,7 @@
     1.4  import org.openrdf.sail.generaldb.algebra.GeneralDBSqlSpatialProperty;
     1.5  import org.openrdf.sail.generaldb.algebra.GeneralDBURIColumn;
     1.6  import org.openrdf.sail.generaldb.algebra.base.GeneralDBSqlExpr;
     1.7 +import org.openrdf.sail.generaldb.exceptions.UnsupportedExtensionFunctionException;
     1.8  import org.openrdf.sail.generaldb.model.GeneralDBPolyhedron;
     1.9  import org.openrdf.sail.generaldb.schema.IdSequence;
    1.10  import org.openrdf.sail.generaldb.util.StSPARQLValueComparator;
    1.11 @@ -246,8 +247,7 @@
    1.12  		Function function = FunctionRegistry.getInstance().get(fc.getURI());
    1.13  		
    1.14  		if (function == null) {
    1.15 -			logger.warn("[Strabon.evaluation(FunctionCall)] Extension function <{}> is not supported.", fc.getURI());
    1.16 -			return null;
    1.17 +			throw new UnsupportedExtensionFunctionException("Extension function " + fc.getURI()+ " is not supported.");
    1.18  		}
    1.19  		
    1.20  		// get the first argument of the function call

     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/generaldb/src/main/java/org/openrdf/sail/generaldb/exceptions/UnsupportedExtensionFunctionException.java	Fri Apr 26 19:48:06 2013 +0300
     2.3 @@ -0,0 +1,30 @@
     2.4 +/**
     2.5 + * This Source Code Form is subject to the terms of the Mozilla Public
     2.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     2.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     2.8 + * 
     2.9 + * Copyright (C) 2013, Pyravlos Team
    2.10 + * 
    2.11 + * http://www.strabon.di.uoa.gr/
    2.12 + */
    2.13 +package org.openrdf.sail.generaldb.exceptions;
    2.14 +
    2.15 +import org.openrdf.query.QueryEvaluationException;
    2.16 +
    2.17 +/**
    2.18 + * This exception is raised when a SPARQL query contains an
    2.19 + * extension function that is not supported by Strabon. 
    2.20 + * 
    2.21 + * @author Charalampos Nikolaou <charnik@di.uoa.gr>
    2.22 + */
    2.23 +public class UnsupportedExtensionFunctionException extends QueryEvaluationException {
    2.24 +	private static final long serialVersionUID = -5926890463141193859L;
    2.25 +
    2.26 +	public UnsupportedExtensionFunctionException() {
    2.27 +		super();
    2.28 +	}
    2.29 +	
    2.30 +	public UnsupportedExtensionFunctionException(String msg) {
    2.31 +		super(msg);
    2.32 +	}
    2.33 +}

     3.1 --- a/runtime/src/main/java/eu/earthobservatory/runtime/monetdb/QueryOp.java	Mon Apr 15 18:39:56 2013 +0300
     3.2 +++ b/runtime/src/main/java/eu/earthobservatory/runtime/monetdb/QueryOp.java	Fri Apr 26 19:48:06 2013 +0300
     3.3 @@ -11,6 +11,7 @@
     3.4  
     3.5  import eu.earthobservatory.utils.Format;
     3.6  
     3.7 +import org.openrdf.sail.generaldb.exceptions.UnsupportedExtensionFunctionException;
     3.8  import org.slf4j.Logger;
     3.9  import org.slf4j.LoggerFactory;
    3.10  
    3.11 @@ -54,6 +55,9 @@
    3.12  			strabon = new Strabon(db, user, passwd, port, host, forceDelete);
    3.13  			strabon.query(queryString, Format.fromString(resultsFormat), strabon.getSailRepoConnection(), System.out);
    3.14  			
    3.15 +		} catch (UnsupportedExtensionFunctionException e) {
    3.16 +			logger.error("[Strabon.QueryOp] {}", e.getMessage());
    3.17 +			
    3.18  		} catch (Exception e) {
    3.19  			logger.error("[Strabon.QueryOp] Error during execution of SPARQL query.", e);
    3.20  			

     4.1 --- a/runtime/src/main/java/eu/earthobservatory/runtime/postgis/QueryOp.java	Mon Apr 15 18:39:56 2013 +0300
     4.2 +++ b/runtime/src/main/java/eu/earthobservatory/runtime/postgis/QueryOp.java	Fri Apr 26 19:48:06 2013 +0300
     4.3 @@ -11,6 +11,7 @@
     4.4  
     4.5  import eu.earthobservatory.utils.Format;
     4.6  
     4.7 +import org.openrdf.sail.generaldb.exceptions.UnsupportedExtensionFunctionException;
     4.8  import org.slf4j.Logger;
     4.9  import org.slf4j.LoggerFactory;
    4.10  
    4.11 @@ -54,6 +55,9 @@
    4.12  			strabon = new Strabon(db, user, passwd, port, host, forceDelete);
    4.13  			strabon.query(queryString, Format.fromString(resultsFormat), strabon.getSailRepoConnection(), System.out);
    4.14  			
    4.15 +		} catch (UnsupportedExtensionFunctionException e) {
    4.16 +			logger.error("[Strabon.QueryOp] {}", e.getMessage());
    4.17 +			
    4.18  		} catch (Exception e) {
    4.19  			logger.error("[Strabon.QueryOp] Error during execution of SPARQL query.", e);
    4.20