mirror of
https://github.com/janeczku/calibre-web
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161 lines
4.7 KiB
Python
161 lines
4.7 KiB
Python
# Copyright (C) 2013 the SQLAlchemy authors and contributors <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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from .base import ischema_names
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from ... import types as sqltypes
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__all__ = ('INT4RANGE', 'INT8RANGE', 'NUMRANGE')
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class RangeOperators(object):
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"""
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This mixin provides functionality for the Range Operators
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listed in Table 9-44 of the `postgres documentation`__ for Range
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Functions and Operators. It is used by all the range types
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provided in the ``postgres`` dialect and can likely be used for
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any range types you create yourself.
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__ http://www.postgresql.org/docs/devel/static/functions-range.html
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No extra support is provided for the Range Functions listed in
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Table 9-45 of the postgres documentation. For these, the normal
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:func:`~sqlalchemy.sql.expression.func` object should be used.
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.. versionadded:: 0.8.2 Support for Postgresql RANGE operations.
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"""
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class comparator_factory(sqltypes.Concatenable.Comparator):
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"""Define comparison operations for range types."""
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def __ne__(self, other):
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"Boolean expression. Returns true if two ranges are not equal"
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return self.expr.op('<>')(other)
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def contains(self, other, **kw):
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"""Boolean expression. Returns true if the right hand operand,
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which can be an element or a range, is contained within the
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column.
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"""
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return self.expr.op('@>')(other)
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def contained_by(self, other):
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"""Boolean expression. Returns true if the column is contained
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within the right hand operand.
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"""
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return self.expr.op('<@')(other)
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def overlaps(self, other):
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"""Boolean expression. Returns true if the column overlaps
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(has points in common with) the right hand operand.
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"""
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return self.expr.op('&&')(other)
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def strictly_left_of(self, other):
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"""Boolean expression. Returns true if the column is strictly
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left of the right hand operand.
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"""
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return self.expr.op('<<')(other)
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__lshift__ = strictly_left_of
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def strictly_right_of(self, other):
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"""Boolean expression. Returns true if the column is strictly
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right of the right hand operand.
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"""
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return self.expr.op('>>')(other)
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__rshift__ = strictly_right_of
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def not_extend_right_of(self, other):
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"""Boolean expression. Returns true if the range in the column
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does not extend right of the range in the operand.
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"""
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return self.expr.op('&<')(other)
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def not_extend_left_of(self, other):
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"""Boolean expression. Returns true if the range in the column
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does not extend left of the range in the operand.
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"""
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return self.expr.op('&>')(other)
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def adjacent_to(self, other):
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"""Boolean expression. Returns true if the range in the column
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is adjacent to the range in the operand.
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"""
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return self.expr.op('-|-')(other)
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def __add__(self, other):
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"""Range expression. Returns the union of the two ranges.
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Will raise an exception if the resulting range is not
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contigous.
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"""
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return self.expr.op('+')(other)
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class INT4RANGE(RangeOperators, sqltypes.TypeEngine):
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"""Represent the Postgresql INT4RANGE type.
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.. versionadded:: 0.8.2
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"""
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__visit_name__ = 'INT4RANGE'
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ischema_names['int4range'] = INT4RANGE
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class INT8RANGE(RangeOperators, sqltypes.TypeEngine):
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"""Represent the Postgresql INT8RANGE type.
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.. versionadded:: 0.8.2
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"""
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__visit_name__ = 'INT8RANGE'
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ischema_names['int8range'] = INT8RANGE
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class NUMRANGE(RangeOperators, sqltypes.TypeEngine):
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"""Represent the Postgresql NUMRANGE type.
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.. versionadded:: 0.8.2
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"""
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__visit_name__ = 'NUMRANGE'
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ischema_names['numrange'] = NUMRANGE
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class DATERANGE(RangeOperators, sqltypes.TypeEngine):
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"""Represent the Postgresql DATERANGE type.
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.. versionadded:: 0.8.2
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"""
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__visit_name__ = 'DATERANGE'
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ischema_names['daterange'] = DATERANGE
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class TSRANGE(RangeOperators, sqltypes.TypeEngine):
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"""Represent the Postgresql TSRANGE type.
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.. versionadded:: 0.8.2
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"""
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__visit_name__ = 'TSRANGE'
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ischema_names['tsrange'] = TSRANGE
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class TSTZRANGE(RangeOperators, sqltypes.TypeEngine):
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"""Represent the Postgresql TSTZRANGE type.
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.. versionadded:: 0.8.2
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"""
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__visit_name__ = 'TSTZRANGE'
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ischema_names['tstzrange'] = TSTZRANGE
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