# Τεκμηρίωση του Django - 1.10.7

# Πηγαίος κώδικας για το django.contrib.gis.gdal.geomtype

    from django.contrib.gis.gdal.error import GDALException
    from django.utils import six

    class OGRGeomType(object):
        "Encapsulates OGR Geometry Types."

        wkb25bit = -2147483648

        # Dictionary of acceptable OGRwkbGeometryType s and their string names.
        _types = {0: 'Unknown',
                  1: 'Point',
                  2: 'LineString',
                  3: 'Polygon',
                  4: 'MultiPoint',
                  5: 'MultiLineString',
                  6: 'MultiPolygon',
                  7: 'GeometryCollection',
                  100: 'None',
                  101: 'LinearRing',
                  102: 'PointZ',
                  1 + wkb25bit: 'Point25D',
                  2 + wkb25bit: 'LineString25D',
                  3 + wkb25bit: 'Polygon25D',
                  4 + wkb25bit: 'MultiPoint25D',
                  5 + wkb25bit: 'MultiLineString25D',
                  6 + wkb25bit: 'MultiPolygon25D',
                  7 + wkb25bit: 'GeometryCollection25D',
                  }
        # Reverse type dictionary, keyed by lower-case of the name.
        _str_types = {v.lower(): k for k, v in _types.items()}

        def __init__(self, type_input):
            "Figures out the correct OGR Type based upon the input."
            if isinstance(type_input, OGRGeomType):
                num = type_input.num
            elif isinstance(type_input, six.string_types):
                type_input = type_input.lower()
                if type_input == 'geometry':
                    type_input = 'unknown'
                num = self._str_types.get(type_input)
                if num is None:
                    raise GDALException('Invalid OGR String Type "%s"' % type_input)
            elif isinstance(type_input, int):
                if type_input not in self._types:
                    raise GDALException('Invalid OGR Integer Type: %d' % type_input)
                num = type_input
            else:
                raise TypeError('Invalid OGR input type given.')

            # Setting the OGR geometry type number.
            self.num = num

        def __str__(self):
            "Returns the value of the name property."
            return self.name

        def __eq__(self, other):
            """
            Does an equivalence test on the OGR type with the given
            other OGRGeomType, the short-hand string, or the integer.
            """
            if isinstance(other, OGRGeomType):
                return self.num == other.num
            elif isinstance(other, six.string_types):
                return self.name.lower() == other.lower()
            elif isinstance(other, int):
                return self.num == other
            else:
                return False

        def __ne__(self, other):
            return not (self == other)

        @property
        def name(self):
            "Returns a short-hand string form of the OGR Geometry type."
            return self._types[self.num]

        @property
        def django(self):
            "Returns the Django GeometryField for this OGR Type."
            s = self.name.replace('25D', '')
            if s in ('LinearRing', 'None'):
                return None
            elif s == 'Unknown':
                s = 'Geometry'
            elif s == 'PointZ':
                s = 'Point'
            return s + 'Field'

        def to_multi(self):
            """
            Transform Point, LineString, Polygon, and their 25D equivalents
            to their Multi... counterpart.
            """
            if self.name.startswith(('Point', 'LineString', 'Polygon')):
                self.num += 3