text: from bonobo.constants import NOT_MODIFIED
  
  from bonobo.config import Configurable, Method
  
  
  class Filter(Configurable):
      """Filter out hashes from the stream depending on the :attr:`filter` callable return value, when called with the
      current hash as parameter.
  
      Can be used as a decorator on a filter callable.
  
      .. attribute:: filter
  
          A callable used to filter lines.
          
          If the callable returns a true-ish value, the input will be passed unmodified to the next items.
          
          Otherwise, it'll be burnt.
  
      """
  
      filter = Method()
  
      def call(self, *args, **kwargs):
          if self.filter(*args, **kwargs):
              return NOT_MODIFIED
  