抽象工厂模式
目的
创建一系列相关的或互相依赖的对象，而不需要指定它们的具体类。通常，创建的类都实现了相同的接口。抽象工厂的客户端并不关心这些对象是如何创建的，它只知道它们是如何结合在一起的。
UML 类图
示例代码
WriterFactory.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
interface WriterFactory
{
public function createCsvWriter(): CsvWriter;
public function createJsonWriter(): JsonWriter;
}
|
CsvWriter.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
interface CsvWriter
{
public function write(array $line): string;
}
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JsonWriter.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
interface JsonWriter
{
public function write(array $data, bool $formatted): string;
}
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UnixCsvWriter.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
class UnixCsvWriter implements CsvWriter
{
public function write(array $line): string
{
return join(',', $line) . "\n";
}
}
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UnixJsonWriter.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
class UnixJsonWriter implements JsonWriter
{
public function write(array $data, bool $formatted): string
{
$options = 0;
if ($formatted) {
$options = JSON_PRETTY_PRINT;
}
return json_encode($data, $options);
}
}
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UnixWriterFactory.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
class UnixWriterFactory implements WriterFactory
{
public function createCsvWriter(): CsvWriter
{
return new UnixCsvWriter();
}
public function createJsonWriter(): JsonWriter
{
return new UnixJsonWriter();
}
}
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WinCsvWriter.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
class WinCsvWriter implements CsvWriter
{
public function write(array $line): string
{
return join(',', $line) . "\r\n";
}
}
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WinJsonWriter.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
class WinJsonWriter implements JsonWriter
{
public function write(array $data, bool $formatted): string
{
return json_encode($data, JSON_PRETTY_PRINT);
}
}
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WinWriterFactory.php
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| <?php
namespace DesignPatterns\Creational\AbstractFactory;
class WinWriterFactory implements WriterFactory
{
public function createCsvWriter(): CsvWriter
{
return new WinCsvWriter();
}
public function createJsonWriter(): JsonWriter
{
return new WinJsonWriter();
}
}
|
测试
Test/AbstractFactoryTest.php
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| <?php declare(strict_types = 1);
namespace DesignPatterns\Creational\AbstractFactory\Tests;
use DesignPatterns\Creational\AbstractFactory\CsvWriter;
use DesignPatterns\Creational\AbstractFactory\JsonWriter;
use DesignPatterns\Creational\AbstractFactory\UnixWriterFactory;
use DesignPatterns\Creational\AbstractFactory\WinWriterFactory;
use DesignPatterns\Creational\AbstractFactory\WriterFactory;
use PHPUnit\Framework\TestCase;
class AbstractFactoryTest extends TestCase
{
public function provideFactory()
{
return [
[new UnixWriterFactory()],
[new WinWriterFactory()]
];
}
public function testCanCreateCsvWriterOnUnix(WriterFactory $writerFactory)
{
$this->assertInstanceOf(JsonWriter::class, $writerFactory->createJsonWriter());
$this->assertInstanceOf(CsvWriter::class, $writerFactory->createCsvWriter());
}
}
|
