use Perl

• Text::Pipe? (Score:1)

  by hanekomu (8123)

  I like the "more ideal" solution of having separate text filters. Since Text::Filter is taken, how about Text::Pipe? After all, the factory method shouldn't be able to just give you one filter, but several filters, piped together.
  
  And I wouldn't put the factory in a ::Common module; just call it Text::Pipe::Factory. It generates "pipe segments" that are Text::Pipe::* objects, all of which are derived from Text::Pipe::Base.
  
  Several pipe segments, piped together, could themselves be pipe segments.
  
  Text::Pipe::*
  • Re: (Score:2)

    by miyagawa (1653)

    I don't care much about names, but I disagree letting Text::Pipe itself have the stackable several filters becasue all filters have the same single filter interface, you don't need to.
    
    Creating a stacked pipe is easy by creating a new Pipe stacker object, like:

    use Text::Pipe::Stackable;
    use Text::Pipe;
     
    my $pipe1 = Text::Pipe->new('foo');
    my $pipe2 = Text::Pipe->new('bar');
    my $pipe3 = Text::Pipe->new('baz');
     
    my $stacked_pipe = Text::Pipe::Stackable->new($pipe1, $pipe2, $pipe3);
     
    • Re:Text::Pipe? (Score:1)

      by hanekomu (8123) on 2007.10.04 4:13 (#58206) Homepage Journal

      Agreed re bike-shed discussion; one more point though:
      
              my $stacked_pipe = Text::Pipe::Stackable->new($pipe1, $pipe2, $pipe3);
      
      Yes, that's a better design pattern. In that case, Text::Pipe::Stackable->new() should be able to take both individual segments as well as Text::Pipe::Stackable objects as well (for a kind of recursive construction).
      
      That is, stacked pipes should - to the user - be indistinguishable from individual pipe segments. It's just some black hole that has an input and an output.
      
      Or, in the case of multiplexers, several outputs. Or with reductors, several inputs. Whatever. :)

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      • Re: (Score:2)

        by miyagawa (1653)

        Yeah, it's caled Composite design pattern and also a Decorator.