92 lines
2.2 KiB
Python
92 lines
2.2 KiB
Python
import six
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class QueryOperatorException(Exception): pass
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import sys
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# move to central spot
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class UnicodeMixin(object):
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if sys.version_info > (3, 0):
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__str__ = lambda x: x.__unicode__()
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else:
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__str__ = lambda x: six.text_type(x).encode('utf-8')
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class BaseQueryOperator(UnicodeMixin):
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# The symbol that identifies this operator in kwargs
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# ie: colname__<symbol>
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symbol = None
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# The comparator symbol this operator uses in cql
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cql_symbol = None
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def __unicode__(self):
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if self.cql_symbol is None:
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raise QueryOperatorException("cql symbol is None")
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return self.cql_symbol
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@classmethod
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def get_operator(cls, symbol):
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if cls == BaseQueryOperator:
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raise QueryOperatorException("get_operator can only be called from a BaseQueryOperator subclass")
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if not hasattr(cls, 'opmap'):
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cls.opmap = {}
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def _recurse(klass):
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if klass.symbol:
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cls.opmap[klass.symbol.upper()] = klass
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for subklass in klass.__subclasses__():
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_recurse(subklass)
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pass
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_recurse(cls)
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try:
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return cls.opmap[symbol.upper()]
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except KeyError:
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raise QueryOperatorException("{} doesn't map to a QueryOperator".format(symbol))
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class BaseWhereOperator(BaseQueryOperator):
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""" base operator used for where clauses """
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class EqualsOperator(BaseWhereOperator):
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symbol = 'EQ'
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cql_symbol = '='
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class InOperator(EqualsOperator):
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symbol = 'IN'
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cql_symbol = 'IN'
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class GreaterThanOperator(BaseWhereOperator):
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symbol = "GT"
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cql_symbol = '>'
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class GreaterThanOrEqualOperator(BaseWhereOperator):
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symbol = "GTE"
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cql_symbol = '>='
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class LessThanOperator(BaseWhereOperator):
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symbol = "LT"
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cql_symbol = '<'
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class LessThanOrEqualOperator(BaseWhereOperator):
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symbol = "LTE"
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cql_symbol = '<='
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class BaseAssignmentOperator(BaseQueryOperator):
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""" base operator used for insert and delete statements """
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class AssignmentOperator(BaseAssignmentOperator):
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cql_symbol = "="
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class AddSymbol(BaseAssignmentOperator):
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cql_symbol = "+"
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