1Class::Adapter(3)     User Contributed Perl Documentation    Class::Adapter(3)
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NAME

6       Class::Adapter - Perl implementation of the "Adapter" Design Pattern
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VERSION

9       version 1.09
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DESCRIPTION

12       The "Class::Adapter" class is intended as an abstract base class for
13       creating any sort of class or object that follows the Adapter pattern.
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15   What is an Adapter?
16       The term Adapter refers to a "Design Pattern" of the same name, from
17       the famous "Gang of Four" book "Design Patterns". Although their
18       original implementation was designed for Java and similar single-
19       inheritance strictly-typed language, the situation for which it applies
20       is still valid.
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22       An Adapter in this Perl sense of the term is when a class is created to
23       achieve by composition (objects containing other object) something that
24       can't be achieved by inheritance (sub-classing).
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26       This is similar to the Decorator pattern, but is intended to be applied
27       on a class-by-class basis, as opposed to being able to be applied one
28       object at a time, as is the case with the Decorator pattern.
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30       The "Class::Adapter" object holds a parent object that it "wraps", and
31       when a method is called on the "Class::Adapter", it manually calls the
32       same (or different) method with the same (or different) parameters on
33       the parent object contained within it.
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35       Instead of these custom methods being hooked in on an object-by-object
36       basis, they are defined at the class level.
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38       Basically, a "Class::Adapter" is one of your fall-back positions when
39       Perl's inheritance model fails you, or is no longer good enough, and
40       you need to do something twisty in order to make several APIs play
41       nicely with each other.
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43   What can I do with the actual Class::Adapter class
44       Well... nothing really. It exist to provide some extremely low level
45       fundamental methods, and to provide a common base for inheritance of
46       Adapter classes.
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48       The base "Class::Adapter" class doesn't even implement a way to push
49       method calls through to the underlying object, since the way in which
50       that happens is the bit that changes from case to case.
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52       To actually DO something, you probably want to go take a look at
53       Class::Adapter::Builder, which makes the creation of Adapter classes
54       relatively quick and easy.
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METHODS

57       The "Class::Adapter" class itself supplies only the two most common
58       methods, a default constructor and a private method to access the
59       underlying object.
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61   new $object
62       The default "new" constructor takes a single object as argument and
63       creates a new object which holds the passed object.
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65       Returns a new "Class::Adapter" object, or "undef" if you do not pass in
66       an object.
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68   _OBJECT_
69       The "_OBJECT_" method is provided primarily as a convenience, and a
70       tool for people implementing sub-classes, and allows the
71       "Class::Adapter" interface to provide a guaranteed correct way of
72       getting to the underlying object, should you need to do so.
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TO DO

75       - Write more comprehensive tests
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SEE ALSO

78       Class::Adapter::Clear, Class::Adapter::Builder, Class::Decorator
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SUPPORT

81       Bugs may be submitted through the RT bug tracker
82       <https://rt.cpan.org/Public/Dist/Display.html?Name=Class-Adapter> (or
83       bug-Class-Adapter@rt.cpan.org <mailto:bug-Class-Adapter@rt.cpan.org>).
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AUTHOR

86       Adam Kennedy <adamk@cpan.org>
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CONTRIBUTORS

89       ·   Adam Kennedy <adam@ali.as>
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91       ·   Karen Etheridge <ether@cpan.org>
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93       ·   gregor herrmann <gregoa@debian.org>
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96       This software is copyright (c) 2005 by Adam Kennedy.
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98       This is free software; you can redistribute it and/or modify it under
99       the same terms as the Perl 5 programming language system itself.
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103perl v5.30.1                      2020-01-29                 Class::Adapter(3)
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