package com.esri.hadoop.hive;
import java.nio.ByteBuffer;
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.hive.pdk.HivePdkUnitTest;
import org.apache.hive.pdk.HivePdkUnitTests;
import com.esri.core.geometry.SpatialReference;
import com.esri.core.geometry.ogc.OGCGeometry;
@Description(
name = "ST_LineFromWKB",
value = "_FUNC_(wkb) - construct an ST_LineString from OGC well-known binary",
extended = "Example:\n"
+ " SELECT _FUNC_(ST_AsBinary(ST_GeomFromText('linestring (1 0, 2 3)'))) FROM src LIMIT 1; -- constructs ST_Linestring\n"
)
@HivePdkUnitTests(
cases = {
@HivePdkUnitTest(
query = "select ST_GeometryType(ST_LineFromWKB(ST_AsBinary(ST_GeomFromText('linestring (10 10, 20 20)')))) from onerow",
result = "ST_LINESTRING"
),
@HivePdkUnitTest(
query = "select ST_Equals(ST_LineFromWKB(ST_AsBinary(ST_GeomFromText('linestring (10 10, 20 20)'))), ST_GeomFromText('linestring (10 10, 20 20)')) from onerow",
result = "true"
)
}
)
public class ST_LineFromWKB extends ST_Geometry {
static final Log LOG = LogFactory.getLog(ST_LineFromWKB.class.getName());
public BytesWritable evaluate(BytesWritable wkb) throws UDFArgumentException {
return evaluate(wkb, 0);
}
public BytesWritable evaluate(BytesWritable wkb, int wkid) throws UDFArgumentException {
try {
SpatialReference spatialReference = null;
if (wkid != GeometryUtils.WKID_UNKNOWN) {
spatialReference = SpatialReference.create(wkid);
}
byte [] byteArr = wkb.getBytes();
ByteBuffer byteBuf = ByteBuffer.allocate(byteArr.length);
byteBuf.put(byteArr);
OGCGeometry ogcObj = OGCGeometry.fromBinary(byteBuf);
ogcObj.setSpatialReference(spatialReference);
if (ogcObj.geometryType().equals("LineString")) {
return GeometryUtils.geometryToEsriShapeBytesWritable(ogcObj);
} else {
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_LINESTRING, GeometryUtils.OGCType.UNKNOWN);
return null;
}
} catch (Exception e) { // IllegalArgumentException, GeometryException
LOG.error(e.getMessage());
return null;
}
}
}