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194 lines
7.2 KiB
Python
194 lines
7.2 KiB
Python
import binascii
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from unittest import skipUnless
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from django.contrib.gis.geos import (
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HAS_GEOS, GEOSGeometry, Point, Polygon, WKBReader, WKBWriter, WKTReader,
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WKTWriter,
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)
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from django.test import SimpleTestCase
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@skipUnless(HAS_GEOS, "Geos is required.")
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class GEOSIOTest(SimpleTestCase):
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def test01_wktreader(self):
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# Creating a WKTReader instance
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wkt_r = WKTReader()
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wkt = 'POINT (5 23)'
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# read() should return a GEOSGeometry
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ref = GEOSGeometry(wkt)
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g1 = wkt_r.read(wkt.encode())
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g2 = wkt_r.read(wkt)
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for geom in (g1, g2):
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self.assertEqual(ref, geom)
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# Should only accept string objects.
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with self.assertRaises(TypeError):
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wkt_r.read(1)
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with self.assertRaises(TypeError):
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wkt_r.read(memoryview(b'foo'))
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def test02_wktwriter(self):
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# Creating a WKTWriter instance, testing its ptr property.
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wkt_w = WKTWriter()
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with self.assertRaises(TypeError):
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wkt_w.ptr = WKTReader.ptr_type()
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ref = GEOSGeometry('POINT (5 23)')
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ref_wkt = 'POINT (5.0000000000000000 23.0000000000000000)'
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self.assertEqual(ref_wkt, wkt_w.write(ref).decode())
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def test_wktwriter_constructor_arguments(self):
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wkt_w = WKTWriter(dim=3, trim=True, precision=3)
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ref = GEOSGeometry('POINT (5.34562 23 1.5)')
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ref_wkt = 'POINT Z (5.35 23 1.5)'
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self.assertEqual(ref_wkt, wkt_w.write(ref).decode())
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def test03_wkbreader(self):
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# Creating a WKBReader instance
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wkb_r = WKBReader()
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hex = b'000000000140140000000000004037000000000000'
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wkb = memoryview(binascii.a2b_hex(hex))
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ref = GEOSGeometry(hex)
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# read() should return a GEOSGeometry on either a hex string or
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# a WKB buffer.
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g1 = wkb_r.read(wkb)
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g2 = wkb_r.read(hex)
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for geom in (g1, g2):
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self.assertEqual(ref, geom)
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bad_input = (1, 5.23, None, False)
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for bad_wkb in bad_input:
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with self.assertRaises(TypeError):
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wkb_r.read(bad_wkb)
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def test04_wkbwriter(self):
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wkb_w = WKBWriter()
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# Representations of 'POINT (5 23)' in hex -- one normal and
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# the other with the byte order changed.
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g = GEOSGeometry('POINT (5 23)')
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hex1 = b'010100000000000000000014400000000000003740'
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wkb1 = memoryview(binascii.a2b_hex(hex1))
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hex2 = b'000000000140140000000000004037000000000000'
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wkb2 = memoryview(binascii.a2b_hex(hex2))
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self.assertEqual(hex1, wkb_w.write_hex(g))
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self.assertEqual(wkb1, wkb_w.write(g))
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# Ensuring bad byteorders are not accepted.
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for bad_byteorder in (-1, 2, 523, 'foo', None):
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# Equivalent of `wkb_w.byteorder = bad_byteorder`
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with self.assertRaises(ValueError):
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wkb_w._set_byteorder(bad_byteorder)
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# Setting the byteorder to 0 (for Big Endian)
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wkb_w.byteorder = 0
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self.assertEqual(hex2, wkb_w.write_hex(g))
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self.assertEqual(wkb2, wkb_w.write(g))
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# Back to Little Endian
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wkb_w.byteorder = 1
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# Now, trying out the 3D and SRID flags.
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g = GEOSGeometry('POINT (5 23 17)')
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g.srid = 4326
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hex3d = b'0101000080000000000000144000000000000037400000000000003140'
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wkb3d = memoryview(binascii.a2b_hex(hex3d))
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hex3d_srid = b'01010000A0E6100000000000000000144000000000000037400000000000003140'
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wkb3d_srid = memoryview(binascii.a2b_hex(hex3d_srid))
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# Ensuring bad output dimensions are not accepted
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for bad_outdim in (-1, 0, 1, 4, 423, 'foo', None):
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with self.assertRaisesMessage(ValueError, 'WKB output dimension must be 2 or 3'):
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wkb_w.outdim = bad_outdim
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# Now setting the output dimensions to be 3
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wkb_w.outdim = 3
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self.assertEqual(hex3d, wkb_w.write_hex(g))
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self.assertEqual(wkb3d, wkb_w.write(g))
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# Telling the WKBWriter to include the srid in the representation.
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wkb_w.srid = True
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self.assertEqual(hex3d_srid, wkb_w.write_hex(g))
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self.assertEqual(wkb3d_srid, wkb_w.write(g))
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def test_wkt_writer_trim(self):
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wkt_w = WKTWriter()
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self.assertFalse(wkt_w.trim)
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self.assertEqual(wkt_w.write(Point(1, 1)), b'POINT (1.0000000000000000 1.0000000000000000)')
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wkt_w.trim = True
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self.assertTrue(wkt_w.trim)
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self.assertEqual(wkt_w.write(Point(1, 1)), b'POINT (1 1)')
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self.assertEqual(wkt_w.write(Point(1.1, 1)), b'POINT (1.1 1)')
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self.assertEqual(wkt_w.write(Point(1. / 3, 1)), b'POINT (0.3333333333333333 1)')
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wkt_w.trim = False
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self.assertFalse(wkt_w.trim)
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self.assertEqual(wkt_w.write(Point(1, 1)), b'POINT (1.0000000000000000 1.0000000000000000)')
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def test_wkt_writer_precision(self):
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wkt_w = WKTWriter()
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self.assertIsNone(wkt_w.precision)
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self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0.3333333333333333 0.6666666666666666)')
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wkt_w.precision = 1
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self.assertEqual(wkt_w.precision, 1)
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self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0.3 0.7)')
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wkt_w.precision = 0
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self.assertEqual(wkt_w.precision, 0)
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self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0 1)')
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wkt_w.precision = None
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self.assertIsNone(wkt_w.precision)
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self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0.3333333333333333 0.6666666666666666)')
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with self.assertRaisesMessage(AttributeError, 'WKT output rounding precision must be '):
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wkt_w.precision = 'potato'
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def test_empty_point_wkb(self):
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p = Point(srid=4326)
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wkb_w = WKBWriter()
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wkb_w.srid = False
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with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'):
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wkb_w.write(p)
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with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'):
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wkb_w.write_hex(p)
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wkb_w.srid = True
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for byteorder, hex in enumerate([
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b'0020000001000010E67FF80000000000007FF8000000000000',
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b'0101000020E6100000000000000000F87F000000000000F87F',
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]):
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wkb_w.byteorder = byteorder
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self.assertEqual(wkb_w.write_hex(p), hex)
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self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p)
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self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex)))
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self.assertEqual(GEOSGeometry(wkb_w.write(p)), p)
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def test_empty_polygon_wkb(self):
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p = Polygon(srid=4326)
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p_no_srid = Polygon()
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wkb_w = WKBWriter()
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wkb_w.srid = True
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for byteorder, hexes in enumerate([
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(b'000000000300000000', b'0020000003000010E600000000'),
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(b'010300000000000000', b'0103000020E610000000000000'),
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]):
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wkb_w.byteorder = byteorder
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for srid, hex in enumerate(hexes):
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wkb_w.srid = srid
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self.assertEqual(wkb_w.write_hex(p), hex)
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self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p if srid else p_no_srid)
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self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex)))
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self.assertEqual(GEOSGeometry(wkb_w.write(p)), p if srid else p_no_srid)
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