require 'constraint'
class TimeConstraint < Constraint
  attr_accessor :time
  
  defaultable_attribute :operator
  defaultable_attribute :attribute
  
  def initialize(time, operator = nil, attribute = nil)
    @time = time
    @default_operator = operator.nil?
    @operator = operator
    @default_attribute = attribute.nil?
    @attribute = attribute || "start_time"
  end
  
  def to_s
    "#{@attribute} #{@operator} #{@time}"
  end
  
  def inspect
    "Time<#{to_s}>"
  end
  
  def eql?(b)
    b.is_a?(TimeConstraint) && @operator == b.operator && @time == b.time && @attribute == b.attribute
  end
end