Creational --- Static Factory
Purpose:
Similiar to the AbstractFactory, this pattern is used to create series of related or dependent objects. The difference between this and abstract factory pattern is that the static factory pattern uses just one static method to create all types of objects it can create. It is usually named factory or build.
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StaticFactory.php
<?php
namespace DesignPatterns\Creational\StaticFactory;
/**
* Note1: Remember, static means global state which is evil because it can't be mocked for tests
* Note2: Cannot be subclassed or mock-upped or have multiple different instances.
*/
final class StaticFactory
{
/**
* @param string $type
*
* @return FormatterInterface
*/
public static function factory(string $type): FormatterInterface
{
if ($type == 'number') {
return new FormatNumber();
}
if ($type == 'string') {
return new FormatString();
}
throw new \InvalidArgumentException("Unknow format given");
}
}
?>
FormatterInterface.php
<?php
namespace DesignPatterns\Creational\StaticFactory;
interface FormatterInterface
{
}
FormatString.php
<?php
namespace DesignPattern\Creational\StaticFactory;
class FormatString implements FormatterInterface
{
}
?>
FormatNumber.php
<?php
namespace DesignPatterns\Creational\StaticFactory;
class FormatNumber implements FormatterInterface
{
}
?>
Tests/StaticFactoryTest.php
<?php
namespace DesignPatterns\Creational\StaticFactory\Tests;
use DesignPatterns\Creational\StaticFactory\StaticFactory;
use PHPUnit\Framework\TestCase;
class StaticFactoryTest extends TestCase
{
public function testCanCreateNumberFormatter()
{
$this->assertInstanceOf(
'DesignPatterns\Creational\StaticFactory\FormatNumber',
StaticFactory::factory('number')
);
public function testCanCreateStringFormatter()
{
$this->assertInstanceOf(
'DesignPatterns\Creational\StaticFactory\FormatString',
StaticFactory::factory('string')
);
}
/**
* @expectedException \InvalidArgumentException
*/
public function testException()
{
StaticFactory::factory('object');
}
}
}
?>
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