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利用phpdoc以及反射实现对象工厂
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<?php | |
/** | |
* author jianglong | |
* date 2019/8/13 上午9:10 | |
*/ | |
/** | |
* Class AbstractFactory | |
* | |
* @author jianglong | |
*/ | |
abstract class AbstractFactory | |
{ | |
/** | |
* @var array $instances | |
*/ | |
protected static $instances = []; | |
/** | |
* @var array $methods | |
*/ | |
protected static $methods = []; | |
/** | |
* | |
* @param $name | |
* @param $param | |
* @return mixed | |
* @throws \ReflectionException | |
* @author jianglong | |
*/ | |
public static function __callStatic($name, $param) | |
{ | |
//没有默认参数,默认为重新生成对象 | |
if (empty($param)) { | |
$param[0] = true; | |
} | |
$ref = new \ReflectionClass(static::class); | |
$namespace = $ref->getNamespaceName(); | |
if (isset(self::$instances[$namespace][$name]) && self::$instances[$namespace][$name] != null && $param[0] === false) { | |
return self::$instances[$namespace][$name]; | |
} | |
if (empty(self::$methods[$namespace])) { | |
static::parseDocMethod($ref->getDocComment(), $namespace); | |
} | |
foreach (self::$methods[$namespace] as $method) { | |
if ($name == $method['name']) { | |
$type = $method['type']; | |
if (strpos($method['type'], '\\') === false) { | |
$type = $ref->getNamespaceName() . '\\' . $type; | |
} | |
$class = new \ReflectionClass($type); | |
if ($class->isInstantiable()) { | |
static::$instances[$namespace][$name] = $class->newInstance(); | |
return static::$instances[$namespace][$name]; | |
} else { | |
throw new \Exception(sprintf("class %s can not instance", $method['type'])); | |
} | |
} | |
} | |
throw new \Exception(sprintf("method %s can not found", $name)); | |
} | |
private static function parseDocMethod(string $doc, string $namespace) | |
{ | |
$find = '@method'; | |
$docs = explode(PHP_EOL, $doc); | |
foreach ($docs as $line) { | |
$position = strpos($line, $find); | |
if ($position !== false) { | |
$method = substr($line, $position + strlen($find)); | |
$methodPieces = preg_replace('/\n{2,}/', '\n', trim($method)); | |
$methodPieces = preg_replace('/\(.*\)/', '', $methodPieces); | |
$methodPieces = explode(' ', $methodPieces); | |
if (count($methodPieces) < 2) { | |
continue; | |
} | |
static::$methods[$namespace][] = [ | |
'type' => trim($methodPieces[0]), | |
'name' => trim($methodPieces[1]), | |
]; | |
} | |
} | |
} | |
} |
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