improved Flyweight

Structural/Flyweight/TextFactory.php

@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+namespace DesignPatterns\Structural\Flyweight;
+
+/**
+ * A factory manages shared flyweights. Clients should not instantiate them directly,
+ * but let the factory take care of returning existing objects or creating new ones.
+ */
+class TextFactory implements \Countable
+{
+    /**
+     * @var Text[]
+     */
+    private $charPool = [];
+
+    public function get(string $name): Text
+    {
+        if (!isset($this->charPool[$name])) {
+            $this->charPool[$name] = $this->create($name);
+        }
+
+        return $this->charPool[$name];
+    }
+
+    private function create(string $name): Text
+    {
+        if (strlen($name) == 1) {
+            return new Character($name);
+        } else {
+            return new Word($name);
+        }
+    }
+
+    public function count(): int
+    {
+        return count($this->charPool);
+    }
+}