class Aws::Query::ParamList

def [](param_name)
  @params[param_name.to_s]
end

def delete(param_name)
  @params.delete(param_name)
end

def each(&block)
  to_a.each(&block)
end

def empty?
  @params.empty?
end

def initialize
  @params = {}
end

def set(param_name, param_value = nil)
  param = Param.new(param_name, param_value)
  @params[param.name] = param
  param
end

def to_a
  @params.values.sort
end

def to_io
  IoWrapper.new(self)
end

def to_s
  to_a.map(&:to_s).join('&')
end