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 org.apache.hive.pdk.HivePdkUnitTest;
import org.apache.hive.pdk.HivePdkUnitTests;
import com.esri.core.geometry.ogc.OGCGeometry;
@Description(name = "ST_Length",
value = "_FUNC_(line) - returns the length of line",
extended = "Example:\n"
+ " SELECT _FUNC_(ST_Line(0.0,0.0, 3.0,4.0)) FROM src LIMIT 1; -- 5.0"
)
@HivePdkUnitTests(
cases = {
@HivePdkUnitTest(
query = "select ST_Length(ST_SetSRID(ST_LineString(0.0,0.0, 3.0,4.0), 0)) from onerow",
result = "5.0"
),
@HivePdkUnitTest(
query = "select ST_Length(ST_SetSRID(ST_MultiLineString(array(1,1, 1,2), array(10,10, 20,10)), 0)) from onerow",
result = "11"
),
@HivePdkUnitTest(
query = "select ST_Length(null) from onerow",
result = "null"
)
}
)
public class ST_Length extends ST_GeometryAccessor {
public static final DoubleWritable resultDouble = new DoubleWritable();
static final Log LOG = LogFactory.getLog(ST_Length.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){
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
resultDouble.set(ogcGeometry.getEsriGeometry().calculateLength2D());
return resultDouble;
}
}