1 files changed, 117 insertions, 0 deletions
diff --git a/phpBB/phpbb/di/ordered_service_collection.php b/phpBB/phpbb/di/ordered_service_collection.php
new file mode 100644
index 0000000000..046012ae5b
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+++ b/phpBB/phpbb/di/ordered_service_collection.php
@@ -0,0 +1,117 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\di;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Collection of services in a specified order
+ */
+class ordered_service_collection extends service_collection
+{
+	/**
+	 * @var bool
+	 */
+	protected $is_ordered;
+
+	/**
+	 * @var array
+	 */
+	protected $service_ids;
+
+	/**
+	 * Constructor
+	 *
+	 * @param ContainerInterface $container Container object
+	 */
+	public function __construct(ContainerInterface $container)
+	{
+		$this->is_ordered = false;
+		$this->service_ids = array();
+
+		parent::__construct($container);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getIterator()
+	{
+		if (!$this->is_ordered)
+		{
+			$this->sort_services();
+		}
+
+		return new service_collection_iterator($this);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function offsetExists($index)
+	{
+		if (!$this->is_ordered)
+		{
+			$this->sort_services();
+		}
+
+		return parent::offsetExists($index);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function offsetGet($index)
+	{
+		if (!$this->is_ordered)
+		{
+			$this->sort_services();
+		}
+
+		return parent::offsetGet($index);
+	}
+
+	/**
+	 * Adds a service ID to the collection
+	 *
+	 * @param string	$service_id
+	 * @param int		$order
+	 */
+	public function add($service_id, $order = 0)
+	{
+		$order = (int) $order;
+		$this->service_ids[$order][] = $service_id;
+		$this->is_ordered = false;
+	}
+
+	protected function sort_services()
+	{
+		if ($this->is_ordered)
+		{
+			return;
+		}
+
+		$this->exchangeArray(array());
+		ksort($this->service_ids);
+		foreach ($this->service_ids as $service_order_group)
+		{
+			foreach ($service_order_group as $service_id)
+			{
+				$this->offsetSet($service_id, null);
+			}
+		}
+
+		$this->is_ordered = true;
+	}
+}