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module Arel
module Predicates
class Predicate
def or(other_predicate)
Or.new(self, other_predicate)
end
def and(other_predicate)
And.new(self, other_predicate)
end
end
class Binary < Predicate
attributes :operand1, :operand2
deriving :initialize
def ==(other)
self.class === other and
@operand1 == other.operand1 and
@operand2 == other.operand2
end
def bind(relation)
self.class.new(operand1.find_correlate_in(relation), operand2.find_correlate_in(relation))
end
end
class Equality < Binary
def ==(other)
Equality === other and
((operand1 == other.operand1 and operand2 == other.operand2) or
(operand1 == other.operand2 and operand2 == other.operand1))
end
end
class GreaterThanOrEqualTo < Binary; end
class GreaterThan < Binary; end
class LessThanOrEqualTo < Binary; end
class LessThan < Binary; end
class Match < Binary; end
class In < Binary; end
end
end
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