not creating nodes density table if was imported from db dump

CHANGELOG.md

+Upcoming version:
+-----------------
+  - not creating nodes density table if was imported from db dump (Nikolaus Krismer)
+
 Version v0.6.0:
 ---------------
   - gradle update (to version 2.11) (Nikolaus Krismer)

bootstrap/importData.sh

@@ -160,10 +160,16 @@ function fn_import_dataset_postgis() {
 	fi
 
 	if $AVAILABLE_POSTGIS && $AVAILABLE_ISOCHRONE_TOOLS; then
-		${EXEC_JAVA} -cp "${DEPLOY_DIR}/isochrone-tools.jar" "at.uibk.dbis.isochrone.generator.density.DensityGenerator" -t "${CITY}" -d "${DENSITY}" >> "$WORKING_DIR/create_datamodel_${CITY}_${SRID}.log" 2>&1
-		if [ $? -ne 0 ]; then
-			fn_echo "An error occurred while creating the node_density table for '${CITY}' using isochrone-tools. The process will exit now with status $?" "ERROR"
-			exit $?
+		local exists_density=$(PGPASSWORD="$PG_DB_PASSWORD" ${EXEC_PSQL} -qAt -U "$PG_DB_USER" -h localhost -d isochrone -c "SELECT EXISTS (SELECT * FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid=C.relnamespace) WHERE nspname = 'public' AND relname='${CITY}_nodes_density')")
+		if [ "$exists_density" == "t" ]; then
+			fn_echo " - nodes_density exists... not re-creating table"
+		else
+			fn_echo "  - nodes_densities does not exist... creating table"
+			${EXEC_JAVA} -cp "${DEPLOY_DIR}/isochrone-tools.jar" "at.uibk.dbis.isochrone.generator.density.DensityGenerator" -t "${CITY}" -d "${DENSITY}" >> "$WORKING_DIR/create_datamodel_${CITY}_${SRID}.log" 2>&1
+			if [ $? -ne 0 ]; then
+				fn_echo "An error occurred while creating the node_density table for '${CITY}' using isochrone-tools. The process will exit now with status $?" "ERROR"
+				exit $?
+			fi
 		fi
 	fi