ST_Relate.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.ogc.OGCGeometry;

@Description(
	name = "ST_Relate",
	value = "_FUNC_(ST_Geometry1, ST_Geometry2) - return true if ST_Geometry1 has the specified DE-9IM relationship with ST_Geometry2",
	extended = "Example:\n" + 
	"  SELECT _FUNC_(st_polygon(2,0, 2,1, 3,1), ST_Polygon(1,1, 1,4, 4,4, 4,1), '****T****') from src LIMIT 1;  -- true\n" + 
	"  SELECT _FUNC_(st_polygon(2,0, 2,1, 3,1), ST_Polygon(1,1, 1,4, 4,4, 4,1), 'T********') from src LIMIT 1;  -- false\n" +
	"  SELECT _FUNC_(st_linestring(0,0, 3,3), ST_linestring(1,1, 4,4), 'T********') from src LIMIT 1;  -- true\n" + 
	"  SELECT _FUNC_(st_linestring(0,0, 3,3), ST_linestring(1,1, 4,4), '****T****') from src LIMIT 1;  -- false\n"
	)

public class ST_Relate extends ST_Geometry {

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

	public BooleanWritable evaluate(BytesWritable geometryref1, BytesWritable geometryref2, String relation)
	{
		if (geometryref1 == null || geometryref2 == null || relation == 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;
		}

		try {
			resultBoolean.set(ogcGeom1.relate(ogcGeom2, relation));
			return resultBoolean;
		} catch (Exception e) {
		    LogUtils.Log_InternalError(LOG, "ST_Relate: " + e);
		    return null;
		}
	}

}