HP-2557: Created PriceTypeCollection for simplified work with PriceTypeInterface

Author: VadymHrechukha

src/product/price/PriceTypeCollection.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace hiqdev\php\billing\product\price;
+
+use Countable;
+use IteratorAggregate;
+use Traversable;
+
+class PriceTypeCollection implements IteratorAggregate, Countable
+{
+    /**
+     * @var string[] - flipped types for fast search
+     */
+    private array $flippedTypes;
+
+    public function __construct(private readonly array $types = [])
+    {
+        $this->flippedTypes = array_flip(array_map(fn(PriceTypeInterface $t) => $t->name(), $types));
+    }
+
+    /**
+     * @return Traversable<int, PriceTypeInterface>
+     */
+    public function getIterator(): Traversable
+    {
+        return new \ArrayIterator($this->types);
+    }
+
+    public function has(string $priceType): bool
+    {
+        return array_key_exists($priceType, $this->flippedTypes);
+    }
+
+    public function count(): int
+    {
+        return count($this->types);
+    }
+
+    public function hasItems(): bool
+    {
+        return $this->count() > 0;
+    }
+}