require 'mocha/no_yields'
require 'mocha/single_yield'
require 'mocha/multiple_yields'

module Mocha

  class YieldParameters

    def initialize
      @parameter_groups = []
    end

    def next_invocation
      case @parameter_groups.length
        when 0 then NoYields.new
        when 1 then @parameter_groups.first
        else @parameter_groups.shift
      end
    end

    def add(*parameters)
      @parameter_groups << SingleYield.new(*parameters)
    end

    def multiple_add(*parameter_groups)
      @parameter_groups << MultipleYields.new(*parameter_groups)
    end

  end

end