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from ql.ast.nodes.expressions.unary_operators.unary_operator import UnaryOperatorNode
from ql.types.decimal import QLDecimal
from ql.types.integer import QLInteger
from ql.types.money import QLMoney
from ql.types.undefined import QLUndefined
class NegativeOperatorNode(UnaryOperatorNode):
def __init__(self, metadata, expression_type, expression, value):
super(NegativeOperatorNode, self).__init__(metadata, expression_type, expression, value)
self.__valid_types = {
QLDecimal: QLDecimal,
QLInteger: QLInteger,
QLMoney: QLMoney}
def get_result_type(self):
if self.__valid_types.get(self.expression.expression_type):
return self.__valid_types.get(self.expression.expression_type)
return QLUndefined
def evaluate(self):
self.value = -self.expression.value
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