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MiddlewareStack.php
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MiddlewareStack.php
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<?php
namespace PhpMimeMailParser;
use PhpMimeMailParser\Contracts\MiddleWare as MiddleWareContracts;
/**
* A stack of middleware chained together by (MiddlewareStack $next)
*/
class MiddlewareStack
{
/**
* Next MiddlewareStack in chain
*
* @var MiddlewareStack
*/
protected $next;
/**
* Middleware in this MiddlewareStack
*
* @var Middleware
*/
protected $middleware;
/**
* Construct the first middleware in this MiddlewareStack
* The next middleware is chained through $MiddlewareStack->add($Middleware)
*
* @param Middleware $middleware
*/
public function __construct(?MiddleWareContracts $middleware = null)
{
$this->middleware = $middleware;
}
/**
* Creates a chained middleware in MiddlewareStack
*
* @param Middleware $middleware
* @return MiddlewareStack Immutable MiddlewareStack
*/
public function add(MiddleWareContracts $middleware)
{
$stack = new static($middleware);
$stack->next = $this;
return $stack;
}
/**
* Parses the MimePart by passing it through the Middleware
* @param MimePart $part
* @return MimePart
*/
public function parse(MimePart $part)
{
if (!$this->middleware) {
return $part;
}
$part = call_user_func(array($this->middleware, 'parse'), $part, $this->next);
return $part;
}
/**
* Creates a MiddlewareStack based on an array of middleware
*
* @param Middleware[] $middlewares
* @return MiddlewareStack
*/
public static function factory(array $middlewares = array())
{
$stack = new static;
foreach ($middlewares as $middleware) {
$stack = $stack->add($middleware);
}
return $stack;
}
/**
* Allow calling MiddlewareStack instance directly to invoke parse()
*
* @param MimePart $part
* @return MimePart
*/
public function __invoke(MimePart $part)
{
return $this->parse($part);
}
}

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MiddlewareStack.php (2 KB)

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