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.IntWritable;
import com.esri.core.geometry.ogc.OGCGeometry;
import com.esri.core.geometry.ogc.OGCMultiPoint;
import com.esri.core.geometry.ogc.OGCMultiLineString;
import com.esri.core.geometry.ogc.OGCMultiPolygon;
@Description(
name = "ST_NumGeometries",
value = "_FUNC_(ST_GeometryCollection) - return the number of geometries in the geometry collection",
extended = "Example:\n"
+ " SELECT _FUNC_(ST_GeomFromText('multipoint ((10 40), (40 30), (20 20), (30 10))')) FROM src LIMIT 1; -- 4\n"
+ " SELECT _FUNC_(ST_GeomFromText('multilinestring ((2 4, 10 10), (20 20, 7 8))')) FROM src LIMIT 1; -- 2\n"
)
public class ST_NumGeometries extends ST_GeometryAccessor {
public static final IntWritable resultInt = new IntWritable();
static final Log LOG = LogFactory.getLog(ST_NumGeometries.class.getName());
public IntWritable 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 {
GeometryUtils.OGCType ogcType = GeometryUtils.getType(geomref);
switch(ogcType) {
case ST_POINT:
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_MULTIPOINT, ogcType);
return null;
case ST_LINESTRING:
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_MULTILINESTRING, ogcType);
return null;
case ST_POLYGON:
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_MULTIPOLYGON, ogcType);
return null;
case ST_MULTIPOINT:
resultInt.set(((OGCMultiPoint)ogcGeometry).numGeometries());
break;
case ST_MULTILINESTRING:
resultInt.set(((OGCMultiLineString)ogcGeometry).numGeometries());
break;
case ST_MULTIPOLYGON:
resultInt.set(((OGCMultiPolygon)ogcGeometry).numGeometries());
break;
}
} catch (ClassCastException cce) { // single vs Multi geometry type
resultInt.set(1);
} catch (Exception e) {
LogUtils.Log_InternalError(LOG, "ST_NumGeometries: " + e);
return null;
}
return resultInt;
}
}