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module Arel
class Predicate
end
class Binary < Predicate
attr_reader :operand1, :operand2
def initialize(operand1, operand2)
@operand1, @operand2 = operand1, operand2
end
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
def to_sql(formatter = nil)
"#{operand1.to_sql} #{predicate_sql} #{operand1.format(operand2)}"
end
alias_method :to_s, :to_sql
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
def predicate_sql
operand2.equality_predicate_sql
end
end
class GreaterThanOrEqualTo < Binary
def predicate_sql; '>=' end
end
class GreaterThan < Binary
def predicate_sql; '>' end
end
class LessThanOrEqualTo < Binary
def predicate_sql; '<=' end
end
class LessThan < Binary
def predicate_sql; '<' end
end
class Match < Binary
def predicate_sql; 'LIKE' end
end
class In < Binary
def predicate_sql; operand2.inclusion_predicate_sql end
end
end
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