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;
// DoubleWritable - must use hive-serde2; the other one produces struct {value:d.d}
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import com.esri.core.geometry.ogc.OGCGeometry;
import com.esri.core.geometry.ogc.OGCPoint;
@Description(
name = "ST_M",
value = "_FUNC_(geometry) - return true if the geometry object is three-dimensional",
extended = "Example:\n"
+ " > SELECT _FUNC_(ST_PointM(3., 4., 2)) FROM src LIMIT 1; -- 2\n"
)
//@HivePdkUnitTests(
// cases = {
// @HivePdkUnitTest(
// query = "select ST_M(ST_Point('point m(0. 3. 1)')) from onerow",
// result = "1.0"
// ),
// @HivePdkUnitTest(
// query = "select ST_M(ST_Point('pointzm (0. 3. 1. 2.)')) from onerow",
// result = "2.0"
// ),
// @HivePdkUnitTest(
// query = "select ST_M(ST_Point(0., 3.)) from onerow",
// result = "null"
// ),
// @HivePdkUnitTest(
// query = "select ST_M(null) from onerow",
// result = "null"
// )
// }
//)
public class ST_M extends ST_GeometryAccessor {
final DoubleWritable resultDouble = new DoubleWritable();
static final Log LOG = LogFactory.getLog(ST_M.class.getName());
public DoubleWritable evaluate(BytesWritable geomref) {
if (geomref == null || geomref.getLength() == 0) {
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
OGCGeometry ogcGeometry = GeometryUtils.geometryFromEsriShape(geomref);
if (ogcGeometry == null){
return null;
}
if (!ogcGeometry.isMeasured()) {
LogUtils.Log_NotMeasured(LOG);
return null;
}
switch(GeometryUtils.getType(geomref)) {
case ST_POINT:
OGCPoint pt = (OGCPoint)ogcGeometry;
resultDouble.set(pt.M());
return resultDouble;
default:
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_POINT, GeometryUtils.getType(geomref));
return null;
}
}
}