ST_GeomCollection.java

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.hive.ql.exec.UDFArgumentException;
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.SpatialReference;
import com.esri.core.geometry.ogc.OGCGeometry;

@Description(
	name = "ST_GeomCollection",
	value = "_FUNC_(wkt) - construct a multi-part ST_Geometry from OGC well-known text",
	extended = "Example:\n" + 
	"  > SELECT _FUNC_('multipoint ((1 0), (2 3))') FROM src LIMIT 1;  -- constructs ST_MultiPoint\n" +
	"OGC Compliance Notes : \n" +
	" ST_GeomCollection on Hive does not support collections - only multi-part geometries.\n" +
	"ST_GeomCollection('POINT(1 1), LINESTRING(2 0,3 0)') -- not supported\n"
	)

//@HivePdkUnitTests(
//	cases = {
//		@HivePdkUnitTest(
//			query = "select ST_Equals(ST_GeomCollection('MULTIPOINT ((10 40), (40 30))'), ST_GeomFromText('MULTIPOINT ((10 40), (40 30))')) from onerow",
//			result = "true"
//			),
//		@HivePdkUnitTest(
//			query = "select ST_Equals(ST_GeomCollection('multilinestring ((2 4, 10 10), (20 20, 7 8))'), ST_GeomFromText('multilinestring ((2 4, 10 10), (20 20, 7 8))')) from onerow",
//			result = "true"
//			),
//		@HivePdkUnitTest(
//			query = "select ST_Equals(ST_GeomCollection('multipolygon (((3 3, 4 6, 5 3, 3 3)),((8 24, 9 25, 1 28, 8 24)))'), ST_GeomFromText('multipolygon (((3 3, 4 6, 5 3, 3 3)),((8 24, 9 25, 1 28, 8 24)))')) from onerow",
//			result = "true"
//			)
//		}
//	)

public class ST_GeomCollection extends ST_Geometry {

	static final Log LOG = LogFactory.getLog(ST_GeomCollection.class.getName());

	public BytesWritable evaluate(Text wkt) throws UDFArgumentException {
		return evaluate(wkt, 0);
	}

	public BytesWritable evaluate(Text wkwrap, int wkid) throws UDFArgumentException {

		String wkt = wkwrap.toString();

		try {
			Geometry geomObj = GeometryEngine.geometryFromWkt(wkt,
															  0,
															  Geometry.Type.Unknown);
			SpatialReference spatialReference = null;  // Idea: OGCGeometry.setSpatialReference after .fromText
			if (wkid != GeometryUtils.WKID_UNKNOWN) {
				spatialReference = SpatialReference.create(wkid);
			}
			OGCGeometry ogcObj = OGCGeometry.createFromEsriGeometry(geomObj, spatialReference);
			return GeometryUtils.geometryToEsriShapeBytesWritable(ogcObj);
		} catch (Exception e) {  // IllegalArgumentException, GeometryException
			LogUtils.Log_InvalidText(LOG, wkt);
			return null;
		}
	}

}