Bioperl-guts: Re: Bioperl: Possible Seq.pm reimplementation
Thu, 29 Jul 1999 14:22:04 -0700 (PDT)
I am reading your Seq.pm reimplementation proposal and have a minor
nitpick with some of the terminology you use.
>From the web page:
An exception to this are methods which rely *solely* on the interface,
and effective operate on top of the abstract interface. We are currently
(at least Matt and I are at the Sanger Centre) calling these methods
decorating methods. For example, an interface could provide methods for
$obj->start() # the start point
$obj->length() # the length of the object
which some objects would implement as a lookup into a hash, and other
objects as a lookup into a database. A decorating method would be
$obj->end() # start+length, but no need to reimplement it
# achievable from just the start and length
Decorating methods, although provided by the interface code can be
overridden by the implementation.
Calling these decorating methods is a little confusing for people familiar
with "Design Patterns" because it sounds close to, but is actually
different from the "Decorator" that they describe. Their decorator
describes a pattern where a class is wrapped around another class and adds
additional functionality by substituting or adding onto the original
As a side note, the concept described here, adding an implementation based
completely on abstractions, is used in a (Design Patterns) Bridge pattern.
I don't know if there's a word specifically for that.
Nevertheless, I would urge you to call these methods something else.
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