# File lib/net/ldap/filter.rb, line 120
  def to_s
    case @op
    when :ne
      "(!(#{@left}=#{@right}))"
    when :eq
      "(#{@left}=#{@right})"
    #when :gt
     # "#{@left}>#{@right}"
    #when :lt
     # "#{@left}<#{@right}"
    when :ge
      "#{@left}>=#{@right}"
    when :le
      "#{@left}<=#{@right}"
    when :and
      "(&(#{@left})(#{@right}))"
    when :or
      "(|(#{@left})(#{@right}))"
    when :not
      "(!(#{@left}))"
    else
      raise "invalid or unsupported operator in LDAP Filter"
    end
  end