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Re: Enums: Properties vs. Methods

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On 29.03.2011 18:26, markspace wrote:
> On 3/29/2011 8:18 AM, Robert Klemme wrote:
>> /** We use custom methods. */
>> public enum Meth {
>
> I agree with Lew that this second example was pretty confusing and hard
> to follow. I also think that it's difficult to predict memory usage
> without careful analysis.
>
> I'd like to see a "motivating" example. What do you actually intend to
> use this for? I can't see that a general case is too interesting, except
> to disqualify the method pattern.

See https://gist.github.com/892503#file_valve.java

>> Then different
>> enums can have differing implementations of the method and we have an
>> instance of Strategy / State pattern.
>
> I don't think State works this way. Strategy ... maybe, but the use of
> enums for Strategy seems confining. I'd just use regular inheritance and
> classes. The "method pattern" for Strategy would be fine I think if it
> weren't shoe-horned into an enum.

Actually I always have a hard time distinguishing those two patterns: 
IMHO they are pretty much identical at the core, the main feature is 
that I delegate functionality to another instance which might be from 
different classes related via inheritance (at least implementing the 
same interface).  The only real difference that I can spot is the point 
in time when the delegate is changed: in one case it might be never 
changed during the lifetime of an instance (strateg) and in the other 
case it is changed whenever a state change occurs (state).  I find that 
only a marginal difference between the two compared to the crucial point 
that those patterns both use an exchangeable delegate.

http://en.wikipedia.org/wiki/State_pattern
http://en.wikipedia.org/wiki/Strategy_pattern

>> Full toy class https://gist.github.com/892503#file_prop_vs_meth.java
>
> I'll check it out.

Thanks.

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-03-29 08:18 -0700
  Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-29 11:47 -0400
    Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-03-30 20:00 +0200
      Re: Enums: Properties vs. Methods Lew <lew@lewscanon.com> - 2011-03-30 13:17 -0700
        Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-03-31 00:48 -0700
          Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-31 08:41 -0400
            Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-03-31 08:26 -0700
              Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-31 22:16 -0400
                Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-04-02 11:56 +0200
                Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-04-02 10:29 -0400
                Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-04-03 13:14 +0200
  Re: Enums: Properties vs. Methods markspace <-@.> - 2011-03-29 09:26 -0700
    Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-03-30 20:06 +0200
      Re: Enums: Properties vs. Methods markspace <-@.> - 2011-03-30 12:40 -0700
        Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-03-31 00:38 -0700
  Re: Enums: Properties vs. Methods Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-03-29 19:03 +0200
    Re: Enums: Properties vs. Methods Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-03-29 19:04 +0200
  Re: Enums: Properties vs. Methods Roedy Green <see_website@mindprod.com.invalid> - 2011-03-29 12:49 -0700
  Re: Enums: Properties vs. Methods Roedy Green <see_website@mindprod.com.invalid> - 2011-03-29 12:52 -0700
    Re: Enums: Properties vs. Methods Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-03-29 22:45 +0200
      Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-29 17:08 -0400
        Re: Enums: Properties vs. Methods Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-03-29 23:25 +0200
          Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-29 19:05 -0400
            Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-29 19:40 -0400
              Re: Enums: Properties vs. Methods Robert Klemme <shortcutter@googlemail.com> - 2011-03-31 02:57 -0700
                Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-31 08:52 -0400
                Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-31 08:54 -0400
            Re: Enums: Properties vs. Methods Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-03-30 18:40 +0200
              Re: Enums: Properties vs. Methods Lew <lew@lewscanon.com> - 2011-03-30 10:33 -0700
                Re: Enums: Properties vs. Methods Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-03-30 20:43 +0200
                Re: Enums: Properties vs. Methods Lew <lew@lewscanon.com> - 2011-03-30 13:20 -0700
                Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-31 08:55 -0400
  Re: Enums: Properties vs. Methods Wanja Gayk <brixomatic@yahoo.com> - 2011-04-02 11:23 +0200
    Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-04-02 10:36 -0400
      Re: Enums: Properties vs. Methods Wanja Gayk <brixomatic@yahoo.com> - 2011-04-02 21:20 +0200

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