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.ogc.OGCGeometry;
@Description(
name = "ST_AsGeoJSON",
value = "_FUNC_(geometry) - return GeoJSON representation of geometry\n",
extended = "Example:\n" +
" SELECT _FUNC_(ST_Point(1.0, 2.0)) from onerow; -- {\"type\":\"Point\", \"coordinates\":[1.0, 2.0]}\n" +
"Note : \n" +
" ST_AsGeoJSON outputs the _geometry_ contents but not _crs_.\n" +
" ST_AsGeoJSON requires geometry-api-java version 1.1 or later.\n"
)
//@HivePdkUnitTests(
// cases = {
// @HivePdkUnitTest(
// query = "select ST_AsGeoJSON(ST_point(1, 2))) from onerow",
// result = "{\"type\":\"Point\", \"coordinates\":[1.0, 2.0]}"
// ),
// @HivePdkUnitTest(
// query = "SELECT ST_AsGeoJSON(ST_MultiLineString(array(1, 1, 2, 2, 3, 3), array(7,7, 8,8, 9,9))) from onerow",
// result = "{\"type\":\"MultiLineString\",\"coordinates\":[[[1.0,1.0],[2.0,2.0],[3.0,3.0]],[[7.0,7.0],[8.0,8.0],[9.0,9.0]]]}"
// ),
// @HivePdkUnitTest(
// query = "SELECT ST_AsGeoJSON(ST_Polygon(1, 1, 1, 4, 4, 4, 4, 1)) from onerow",
// result = "{\"type\":\"Polygon\",\"coordinates\":[[[1.0,1.0],[1.0,4.0],[4.0,4.0],[4.0,1.0],[1.0,1.0]]]}"
// )
// }
// )
public class ST_AsGeoJson extends ST_Geometry {
final Text resultText = new Text();
static final Log LOG = LogFactory.getLog(ST_AsGeoJson.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;
}
try {
String outJson = ogcGeometry.asGeoJson();
resultText.set(outJson);
return resultText;
} catch (Exception e) {
LogUtils.Log_InternalError(LOG, "ST_AsGeoJSON: " + e);
return null;
}
}
}