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module Arel
class Predicate
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
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