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.hive.pdk.HivePdkUnitTest;
import org.apache.hive.pdk.HivePdkUnitTests;
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));
}
}