package com.esri.hadoop.hive;
import java.util.List;
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.hive.ql.exec.UDFArgumentLengthException;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;
import org.apache.hive.pdk.HivePdkUnitTest;
import org.apache.hive.pdk.HivePdkUnitTests;
import com.esri.core.geometry.Polyline;
import com.esri.core.geometry.ogc.OGCGeometry;
@Description(
name = "ST_MultiLineString",
value = "_FUNC_(array(x1, y1, x2, y2, ... ), array(x1, y1, x2, y2, ... ), ... ) - constructor for 2D multi line string\n"
+ "_FUNC_('multilinestring( ... )') - constructor for 2D multi line string",
extended = "Example:\n" +
" SELECT _FUNC_(array(1, 1, 2, 2), array(10, 10, 20, 20)) from src LIMIT 1;\n" +
" SELECT _FUNC_('multilinestring ((1 1, 2 2), (10 10, 20 20))', 0) from src LIMIT 1;")
@HivePdkUnitTests(
cases = {
@HivePdkUnitTest(
query = "select st_asjson(ST_MultiLineString(1, 1, 2, 2, 3, 3)) from onerow",
result = "{\"points\":[[1.0,1.0],[2.0,2.0],[3.0,3.0]]}"
),
@HivePdkUnitTest(
query = "select ST_Equals(ST_MultiLinestring('multilinestring ((2 4, 10 10), (20 20, 7 8))'), ST_GeomFromText('multilinestring ((2 4, 10 10), (20 20, 7 8))')) from onerow",
result = "true"
)
}
)
public class ST_MultiLineString extends ST_Geometry {
static final Log LOG = LogFactory.getLog(ST_MultiLineString.class.getName());
// Number-pairs constructor
public BytesWritable evaluate(List<DoubleWritable> ... multipaths) throws UDFArgumentLengthException{
if (multipaths == null || multipaths.length == 0) {
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
try {
Polyline mPolyline = new Polyline();
int arg_idx=0;
for (List<DoubleWritable> multipath : multipaths)
{
if (multipath.size() %2 != 0){
LogUtils.Log_VariableArgumentLengthXY(LOG, arg_idx);
return null;
}
mPolyline.startPath(multipath.get(0).get(), multipath.get(1).get());
for (int i=2;i<multipath.size();i+=2){
mPolyline.lineTo(multipath.get(i).get(), multipath.get(i+1).get());
}
arg_idx++;
}
return GeometryUtils.geometryToEsriShapeBytesWritable(OGCGeometry.createFromEsriGeometry(mPolyline, null, true));
} catch (Exception e) {
LogUtils.Log_InternalError(LOG, "ST_MultiLineString: " + e);
return null;
}
}
// WKT constructor - can use SetSRID on constructed multi-linestring
public BytesWritable evaluate(Text wkwrap) throws UDFArgumentException {
String wkt = wkwrap.toString();
try {
OGCGeometry ogcObj = OGCGeometry.fromText(wkt);
ogcObj.setSpatialReference(null);
if (ogcObj.geometryType().equals("MultiLineString")) {
return GeometryUtils.geometryToEsriShapeBytesWritable(ogcObj);
} else {
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_MULTILINESTRING, GeometryUtils.OGCType.UNKNOWN);
return null;
}
} catch (Exception e) { // IllegalArgumentException, GeometryException
LogUtils.Log_InvalidText(LOG, wkt);
return null;
}
}
}