. PHP Design Patterns . PHP Design Patterns Abstract Factory
PHP Design Patterns Abstract Factory
About the Abstract Factory
In the Abstract Factory Pattern, an abstract factory defines what objects the non-abstract or concrete factory will need to be able to create.
The concrete factory must create the correct objects for it's context, insuring that all objects created by the concrete factory have been chosen to be able to work correctly for a given circumstance.
In this example we have an abstract factory, AbstractBookFactory, that specifies two classes, AbstractPHPBook and AbstractMySQLBook, which will need to be created by the concrete factory.
The concrete class OReillyBookfactory extends AbstractBookFactory, and can create the OReillyMySQLBook and OReillyPHPBook classes, which are the correct classes for the context of OReilly.
AbstractBookFactory.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
abstract class AbstractBookFactory {
abstract function makePHPBook();
abstract function makeMySQLBook();
}
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OReillyBookFactory.php
//copyright Lawrence Truett and FluffyCat.com 2005, all rights reserved
include_once('AbstractBookFactory.php');
include_once('OReillyPHPBook.php');
include_once('OReillyMySQLBook.php');
class OReillyBookFactory extends AbstractBookFactory {
private $context = "OReilly";
function makePHPBook() {return new OReillyPHPBook;}
function makeMySQLBook() {return new OReillyMySQLBook;}
}
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SamsBookFactory.php
//copyright Lawrence Truett and FluffyCat.com 2005, all rights reserved
include_once('AbstractBookFactory.php');
include_once('SamsPHPBook.php');
include_once('SamsMySQLBook.php');
class SamsBookFactory extends AbstractBookFactory {
private $context = "Sams";
function makePHPBook() {return new SamsPHPBook;}
function makeMySQLBook() {return new SamsMySQLBook;}
}
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AbstractBook.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
abstract class AbstractBook {
abstract function getAuthor();
abstract function getTitle();
}
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AbstractMySQLBook.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
include_once('AbstractBook.php');
abstract class AbstractMySQLBook {
private $subject = "MySQL";
}
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OReillyMySQLBook.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
include_once('AbstractMySQLBook.php');
class OReillyMySQLBook extends AbstractMySQLBook {
private $author;
private $title;
function __construct() {
$this->author = 'George Reese, Randy Jay Yarger, and Tim King';
$this->title = 'Managing and Using MySQL';
}
function getAuthor() {return $this->author;}
function getTitle() {return $this->title;}
}
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SamsMySQLBook.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
include_once('AbstractMySQLBook.php');
class SamsMySQLBook extends AbstractMySQLBook {
private $author;
private $title;
function __construct() {
$this->author = 'Paul Dubois';
$this->title = 'MySQL, 3rd Edition';
}
function getAuthor() {return $this->author;}
function getTitle() {return $this->title;}
}
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AbstractPHPBook.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
include_once('AbstractBook.php');
abstract class AbstractPHPBook {
private $subject = "PHP";
}
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OReillyPHPBook.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
include_once('AbstractPHPBook.php');
class OReillyPHPBook extends AbstractPHPBook {
private $author;
private $title;
private static $oddOrEven = 'odd';
function __construct() {
//alternate between 2 books
if ('odd' == self::$oddOrEven) {
$this->author = 'Rasmus Lerdorf and Kevin Tatroe';
$this->title = 'Programming PHP';
self::$oddOrEven = 'even';
} else {
$this->author = 'David Sklar and Adam Trachtenberg';
$this->title = 'PHP Cookbook';
self::$oddOrEven = 'odd';
}
}
function getAuthor() {return $this->author;}
function getTitle() {return $this->title;}
}
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SamsPHPBook.php
//copyright Lawrence Truett and FluffyCat.com 2007, all rights reserved
include_once('AbstractPHPBook.php');
class SamsPHPBook extends AbstractPHPBook {
private $author;
private $title;
function __construct() {
//alternate randomly between 2 books
mt_srand((double)microtime()*10000000);
$rand_num = mt_rand(0,1);
if (1 > $rand_num) {
$this->author = 'George Schlossnagle';
$this->title = 'Advanced PHP Programming';
} else {
$this->author = 'Christian Wenz';
$this->title = 'PHP Phrasebook';
}
}
function getAuthor() {return $this->author;}
function getTitle() {return $this->title;}
}
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testAbstractFactory.php
//copyright Lawrence Truett and FluffyCat.com 2005, all rights reserved
include_once('OReillyBookFactory.php');
include_once('SamsBookFactory.php');
echo tagins("html");
echo tagins("head");
echo tagins("/head");
echo tagins("body");
echo "BEGIN TESTING ABSTRACT FACTORY PATTERN";
echo tagins("br").tagins("br");
echo 'testing OReillyBookFactory'.tagins("br");
$bookFactoryInstance = new OReillyBookFactory;
testConcreteFactory($bookFactoryInstance);
echo tagins("br");
echo 'testing SamsBookFactory'.tagins("br");
$bookFactoryInstance = new SamsBookFactory;
testConcreteFactory($bookFactoryInstance);
echo tagins("br");
echo "END TESTING ABSTRACT FACTORY PATTERN";
echo tagins("br");
echo tagins("/body");
echo tagins("/html");
function testConcreteFactory($bookFactoryInstance) {
$phpBookOne = $bookFactoryInstance->makePHPBook();
echo 'first php Author: '.
$phpBookOne->getAuthor().tagins("br");
echo 'first php Title: '.
$phpBookOne->getTitle().tagins("br");
$phpBookTwo = $bookFactoryInstance->makePHPBook();
echo 'second php Author: '.
$phpBookTwo->getAuthor().tagins("br");
echo 'second php Title: '.
$phpBookTwo->getTitle().tagins("br");
$mySqlBook = $bookFactoryInstance->makeMySQLBook();
echo 'MySQL Author: '.
$mySqlBook->getAuthor().tagins("br");
echo 'MySQL Title: '.
$mySqlBook->getTitle().tagins("br");
}
//doing this so code can be displayed without breaks
function tagins($stuffing) {
return "<".$stuffing.">";
}
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output of testAbstractFactory.php
BEGIN TESTING ABSTRACT FACTORY PATTERN
testing OReillyBookFactory first php Author: Rasmus Lerdorf and Kevin Tatroe first php Title: Programming PHP second php Author: David Sklar and Adam Trachtenberg second php Title: PHP Cookbook MySQL Author: George Reese, Randy Jay Yarger, and Tim King MySQL Title: Managing and Using MySQL
testing SamsBookFactory first php Author: Christian Wenz first php Title: PHP Phrasebook second php Author: George Schlossnagle second php Title: Advanced PHP Programming MySQL Author: Paul Dubois MySQL Title: MySQL, 3rd Edition
END TESTING ABSTRACT FACTORY PATTERN
References
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