Extract CollectionReferenceCollection class from ACL.

lib/Alchemy/Phrasea/Collection/Reference/CollectionReferenceCollection.php

@@ -0,0 +1,58 @@
+<?php
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2016 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\Collection\Reference;
+
+use Assert\Assertion;
+
+class CollectionReferenceCollection implements \IteratorAggregate
+{
+    /**
+     * @var CollectionReference[]
+     */
+    private $references;
+
+    /**
+     * @param CollectionReference[] $references
+     */
+    public function __construct($references)
+    {
+        Assertion::allIsInstanceOf($references, CollectionReference::class);
+        $this->references = $references instanceof \Traversable ? iterator_to_array($references) : $references;
+    }
+
+    /**
+     * Returns an array of array with actual index as leaf value.
+     *
+     * @return array<int,array<int,mixed>>
+     */
+    public function groupByDataboxIdAndCollectionId()
+    {
+        $groups = [];
+
+        foreach ($this->references as $index => $reference) {
+            $databoxId = $reference->getDataboxId();
+            $group = isset($groups[$databoxId]) ? $groups[$databoxId] : [];
+
+            $group[$reference->getCollectionId()] = $index;
+            $groups[$databoxId] = $group;
+        }
+
+        return $groups;
+    }
+
+    /**
+     * @return \ArrayIterator|CollectionReference[]
+     */
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->references);
+    }
+}