openvk/Web/Models/Repositories/Util/EntityStream.php

57 lines
1.6 KiB
PHP

<?php declare(strict_types=1);
namespace openvk\Web\Models\Repositories\Util;
use Nette\Database\Table\ActiveRow;
class EntityStream implements \IteratorAggregate
{
private $dbStream;
private $entityClass;
function __construct(string $class, \Traversable $dbStream)
{
$this->dbStream = $dbStream;
$this->entityClass = $class[0] === "\\" ? $class : "openvk\\Web\\Models\\Entities\\$class";
}
/**
* Almost shorthand for (clone $this->dbStream)
* Needed because it's used often in this class. And it's used often to prevent changing mutable dbStream.
*/
private function dbs(): \Traversable
{
return (clone $this->dbStream);
}
private function getEntity(ActiveRow $result)
{
return new $this->entityClass($result);
}
private function stream(\Traversable $iterator): \Traversable
{
foreach($iterator as $result)
yield $this->getEntity($result);
}
function getIterator(): \Traversable
{
trigger_error("Trying to use EntityStream as iterator directly. Are you sure this is what you want?", E_USER_WARNING);
return $this->stream($this->dbs());
}
function page(int $page, ?int $perPage = NULL): \Traversable
{
return $this->stream($this->dbs()->page($page, $perPage ?? OPENVK_DEFAULT_PER_PAGE));
}
function offsetLimit(int $offset = 0, ?int $limit = NULL): \Traversable
{
return $this->stream($this->dbs()->limit($limit ?? OPENVK_DEFAULT_PER_PAGE, $offset));
}
function size(): int
{
return sizeof($this->dbs());
}
}