Hello.
I am using GeometryFactory.buildGeometry() to create a common geometry
from a List of geometries. I just discovered that with a List with a
single MultiPolygon the buildGeometry() returns a GeometryCollection
of that single MultiPolygon. This is with jts-1.9.
From the documentation, buildGeometry() will collect several Polygons
to a common MultiPolygon. Perhaps it should also collect several
MultiPolygons to a common MultiPolygon?
public void testBuildGeometryWithSingleMultipolygon() {
String a = "MULTIPOLYGON (((105 -9, 104.7719981 -9, 99 -9, 99
-6.6735324, 99 -6.4769693, 99 -5.5, 99.1535114 -5.5, 99.6949253 -5.5,
100.4429739 -5.5, 100.4968864 -5.5, 100.5130253 -5.5, 100.5618621
-5.5, 100.5837587 -5.5, 100.6700839 -5.5, 101.1448967 -5.5,
101.2765547 -5.5, 101.5917338 -5.5, 101.8689332 -5.5, 101.9972856
-5.5, 102.0943862 -5.5, 102.2292855 -5.5, 102.2646017 -5.5,
102.2882864 -5.5, 102.3513297 -5.5, 102.3738666 -5.5, 102.4045993
-5.5, 102.4964335 -5.5, 102.701965 -5.5, 103.0498502 -5.5, 103.5239897
-5.5, 103.965577 -5.5, 104.0948186 -5.5, 104.1457929 -5.5, 104.1895725
-5.5, 105 -5.5, 105 -5.7329791, 105 -5.8032427, 105 -6.0876523, 105
-6.1837199, 105 -6.23532, 105 -6.344359, 105 -6.434243, 105
-6.6469016, 105 -7.1982306, 105 -7.6548277, 105 -8.0483834, 105
-8.1408521, 105 -8.2582398, 105 -8.8460797, 105 -9)), ((100.547619 0,
103.5872531 0, 103.5933789 0, 103.770947 0, 104.4792819 0, 104.5856461
0, 105 0, 105 -2.3273102, 105 -2.4860457, 105 -5.5, 100.547619 0)))";
GeometryFactory gf = new GeometryFactory();
try {
Geometry g1 = new WKTReader().read(a);
assertTrue(g1.isValid());
Geometry g2 =
gf.buildGeometry(Collections.singletonList(g1));
assertTrue(g2.isValid());
assertTrue("should be " + MultiPolygon.class + ", not " +
g2.getClass(), g2 instanceof MultiPolygon);
} catch (ParseException e) {
fail(e.getMessage());
}
}
Regards,
- Tore.
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