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 org.apache.hive.pdk.HivePdkUnitTest;
import org.apache.hive.pdk.HivePdkUnitTests;
import com.esri.core.geometry.ogc.OGCGeometry;
import com.esri.core.geometry.ogc.OGCLineString;
@Description(
name = "ST_Ring",
value = "_FUNC_(ST_LineString) - return true if the linestring is closed & simple",
extended = "Example:\n"
+ " SELECT _FUNC_(ST_LineString(0.,0., 3.,4., 0.,4., 0.,0.)) FROM src LIMIT 1; -- true\n"
+ " SELECT _FUNC_(ST_LineString(0.,0., 1.,1., 1.,2., 2.,1., 1.,1., 0.,0.)) FROM src LIMIT 1; -- false\n"
+ " SELECT _FUNC_(ST_LineString(0.,0., 3.,4.)) FROM src LIMIT 1; -- false\n"
)
@HivePdkUnitTests(
cases = {
@HivePdkUnitTest(
query = "select ST_IsRing(ST_LineString(0.,0., 3.,4., 0.,4., 0.,0.)) from onerow",
result = "true"
),
@HivePdkUnitTest(
query = "select ST_IsRing(ST_LineString(0.,0., 3.,4.)) from onerow",
result = "false"
),
@HivePdkUnitTest(
query = "select ST_IsRing(ST_LineString(0.,0., 1.,1., 1.,2., 2.,1., 1.,1., 0.,0.)) from onerow",
result = "false"
),
@HivePdkUnitTest(
query = "select ST_IsRing(null) from onerow",
result = "null"
)
}
)
public class ST_IsRing extends ST_GeometryAccessor {
public static final BooleanWritable resultBoolean = new BooleanWritable();
static final Log LOG = LogFactory.getLog(ST_IsRing.class.getName());
public BooleanWritable evaluate(BytesWritable geomref) {
if (geomref == null || geomref.getLength() == 0) {
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
OGCGeometry ogcGeometry = GeometryUtils.geometryFromEsriShape(geomref);
if (ogcGeometry == null){
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
try {
switch(GeometryUtils.getType(geomref)) {
case ST_LINESTRING:
OGCLineString lns = (OGCLineString)ogcGeometry;
resultBoolean.set(lns.isClosed() && lns.isSimple());
return resultBoolean;
default: // ST_IsRing gives ERROR on Point, Polygon, or MultiLineString - on Postgres
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_LINESTRING, GeometryUtils.getType(geomref));
return null;
}
} catch (Exception e) {
LogUtils.Log_InternalError(LOG, "ST_IsRing" + e);
return null;
}
}
}