package com.esri.hadoop.hive;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;
import com.esri.core.geometry.Geometry;
import com.esri.core.geometry.GeometryEngine;
import com.esri.core.geometry.ogc.OGCGeometry;
@Description(
name = "ST_AsJSON",
value = "_FUNC_(ST_Geometry) - return JSON representation of ST_Geometry\n",
extended = "Example:\n" +
" SELECT _FUNC_(ST_Point(1.0, 2.0)) from onerow; -- {\"x\":1.0,\"y\":2.0}\n" +
" SELECT _FUNC_(ST_SetSRID(ST_Point(1, 1), 4326)) from onerow; -- {\"x\":1.0,\"y\":1.0,\"spatialReference\":{\"wkid\":4326}}")
//@HivePdkUnitTests(
// cases = {
// @HivePdkUnitTest(
// query = "select ST_AsJSON(ST_Point(1, 2)), ST_AsJSON(ST_SetSRID(ST_Point(1, 1), 4326)) from onerow",
// result = "{\"x\":1.0,\"y\":2.0} {\"x\":1.0,\"y\":1.0,\"spatialReference\":{\"wkid\":4326}}"
// ),
// @HivePdkUnitTest(
// query = "SELECT ST_AsJSON(ST_MultiLineString(array(1, 1, 2, 2, 3, 3), array(10, 10, 11, 11, 12, 12))) from onerow",
// result = "{\"paths\":[[[1.0,1.0],[2.0,2.0],[3.0,3.0]],[[10.0,10.0],[11.0,11.0],[12.0,12.0]]]}"
// ),
// @HivePdkUnitTest(
// query = "SELECT ST_AsJSON(ST_Polygon(1, 1, 1, 4, 4, 4, 4, 1)), ST_AsJSON(ST_Polygon(1, 1)) from onerow",
// result = "{\"rings\":[[[1.0,1.0],[1.0,4.0],[4.0,4.0],[4.0,1.0],[1.0,1.0]]]} NULL"
// )
// }
// )
public class ST_AsJson extends ST_Geometry {
static final Log LOG = LogFactory.getLog(ST_AsJson.class.getName());
public Text evaluate(BytesWritable geomref){
if (geomref == null || geomref.getLength() == 0){
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
OGCGeometry ogcGeometry = GeometryUtils.geometryFromEsriShape(geomref);
if (ogcGeometry == null){
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
Geometry esriGeom = ogcGeometry.getEsriGeometry();
int wkid = GeometryUtils.getWKID(geomref);
return new Text(GeometryEngine.geometryToJson(wkid, esriGeom));
}
}
