ST_Envelope.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.io.BytesWritable;


import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.SpatialReference;
import com.esri.core.geometry.ogc.OGCGeometry;

@Description(
	name = "ST_Envelope",
	value = "_FUNC_(ST_Geometry) - the envelope of the ST_Geometry",
	extended = "Example:\n" + 
	"SELECT _FUNC_(ST_LineString(0,0, 2,2)) from src LIMIT 1;  -- POLYGON ((0 0, 2 0, 2 2, 0 2, 0 0))\n" + 
	"SELECT _FUNC_(ST_Polygon(2,0, 2,3, 3,0)) from src LIMIT 1;  -- POLYGON ((2 0, 3 0, 3 3, 2 3, 2 0))\n"  +
	"OGC Compliance Notes : \n" +
	" In the case of a point or a vertical or horizontal line," +
	" ST_Envelope may either apply a tolerance or return an empty envelope."
	)
//@HivePdkUnitTests(
//	cases = {
//		@HivePdkUnitTest(
//			query = "select ST_EnvIntersects(ST_LineString(0,0, 1,1), ST_LineString(1,3, 2,2)) from onerow",
//			result = "false"
//			),
//		@HivePdkUnitTest(
//			query = "select ST_EnvIntersects(ST_LineString(0,0, 2,2), ST_LineString(1,0, 3,2)) from onerow",
//			result = "true"
//			),
//		@HivePdkUnitTest(
//			query = "select ST_EnvIntersects(null, ST_LineString(0,0, 1,1)) from onerow",
//			result = "null"
//			)
//	}
//)

public class ST_Envelope extends ST_GeometryProcessing {
	static final Log LOG = LogFactory.getLog(ST_Envelope.class.getName());

	public BytesWritable evaluate(BytesWritable geometryref)
	{
		if (geometryref == null || geometryref.getLength() == 0) {
			LogUtils.Log_ArgumentsNull(LOG);
			return null;
		}

		OGCGeometry ogcGeometry = GeometryUtils.geometryFromEsriShape(geometryref);
		if (ogcGeometry == null){
			LogUtils.Log_ArgumentsNull(LOG);
			return null;
		}

		int wkid = GeometryUtils.getWKID(geometryref);
		SpatialReference spatialReference = null;
		if (wkid != GeometryUtils.WKID_UNKNOWN) {
			spatialReference = SpatialReference.create(wkid);
		}
		Envelope envBound = new Envelope();
		ogcGeometry.getEsriGeometry().queryEnvelope(envBound);
		return GeometryUtils.geometryToEsriShapeBytesWritable(OGCGeometry.createFromEsriGeometry(envBound,
																  spatialReference));
	}

}