ST_EnvIntersects.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.BooleanWritable;
import org.apache.hadoop.io.BytesWritable;


import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.Geometry;

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

@Description(
	name = "ST_EnvIntersects",
	value = "_FUNC_(ST_Geometry1, ST_Geometry2) - return true if the envelopes of ST_Geometry1 and ST_Geometry2 intersect",
	extended = "Example:\n" + 
	"SELECT _FUNC_(ST_LineString(0,0, 1,1), ST_LineString(1,3, 2,2)) from src LIMIT 1;  -- return false\n" + 
	"SELECT _FUNC_(ST_LineString(0,0, 2,2), ST_LineString(1,0, 3,2)) from src LIMIT 1;  -- return true\n"	
	)
//@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_EnvIntersects extends ST_Geometry {

	final BooleanWritable resultBoolean = new BooleanWritable();
	static final Log LOG = LogFactory.getLog(ST_EnvIntersects.class.getName());

	public BooleanWritable evaluate(BytesWritable geometryref1, BytesWritable geometryref2)
	{
		if (geometryref1 == null || geometryref2 == null ||
		    geometryref1.getLength() == 0 || geometryref2.getLength() == 0) {
			LogUtils.Log_ArgumentsNull(LOG);
			return null;
		}
		if (!GeometryUtils.compareSpatialReferences(geometryref1, geometryref2)) {
			LogUtils.Log_SRIDMismatch(LOG, geometryref1, geometryref2);
			return null;
		}

		OGCGeometry ogcGeom1 = GeometryUtils.geometryFromEsriShape(geometryref1);
		OGCGeometry ogcGeom2 = GeometryUtils.geometryFromEsriShape(geometryref2);
		if (ogcGeom1 == null || ogcGeom2 == null){
			LogUtils.Log_ArgumentsNull(LOG);
			return null;
		}

		Geometry geometry1 = ogcGeom1.getEsriGeometry();
		Geometry geometry2 = ogcGeom2.getEsriGeometry();
		Envelope env1 = new Envelope(), env2 = new Envelope();
		geometry1.queryEnvelope(env1);
		geometry2.queryEnvelope(env2);

		resultBoolean.set(env1.isIntersecting(env2));
		return resultBoolean;
	}

}