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.MultiPath;
import com.esri.core.geometry.Point;
import com.esri.core.geometry.ogc.OGCGeometry;
@Description(
name = "ST_IsClosed",
value = "_FUNC_(ST_[Multi]LineString) - return true if the linestring or multi-line is closed",
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., 3.,4.)) FROM src LIMIT 1; -- false\n"
)
@HivePdkUnitTests(
cases = {
@HivePdkUnitTest(
query = "select ST_IsClosed(ST_LineString(0.,0., 3.,4.)) from onerow",
result = "false"
),
@HivePdkUnitTest(
query = "select ST_IsClosed(ST_LineString(0.,0., 3.,4., 0.,4., 0.,0.)) from onerow",
result = "true"
),
@HivePdkUnitTest(
query = "select ST_IsClosed(ST_MultiLineString('multilinestring ((0 0, 3 4, 2 2), (6 2, 7 8))')) from onerow",
result = "false"
),
@HivePdkUnitTest(
query = "select ST_IsClosed(ST_MultiLineString('multilinestring ((0 0, 3 4, 2 2, 0 0), (6 2, 7 8))')) from onerow",
result = "false"
),
@HivePdkUnitTest(
query = "select ST_IsClosed(ST_MultiLineString('multilinestring ((0 0, 3 4, 2 2, 0 0), (6 2, 7 5, 6 8, 6 2))')) from onerow",
result = "true"
),
@HivePdkUnitTest(
query = "select ST_IsClosed(null) from onerow",
result = "null"
)
}
)
public class ST_IsClosed extends ST_GeometryAccessor {
public static final BooleanWritable resultBoolean = new BooleanWritable();
static final Log LOG = LogFactory.getLog(ST_IsClosed.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:
case ST_MULTILINESTRING:
MultiPath lines = (MultiPath)(ogcGeometry.getEsriGeometry());
int nPaths = lines.getPathCount();
boolean rslt = true;
for (int ix = 0; rslt && ix < nPaths; ix++) {
Point p0 = lines.getPoint(lines.getPathStart(ix));
Point pf = lines.getPoint(lines.getPathEnd(ix)-1);
rslt = rslt && pf.equals(p0); // no tolerance - OGC
}
resultBoolean.set(rslt);
return resultBoolean;
default: // ST_IsClosed gives ERROR on Point or Polygon, on Postgres/Oracle
LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_LINESTRING, GeometryUtils.getType(geomref));
return null;
}
} catch (Exception e) {
LogUtils.Log_InternalError(LOG, "ST_IsClosed" + e);
return null;
}
}
}