Add abstract class for enum classes to extend.

Author: Potherca

src/Enum/AbstractEnum.php

@@ -0,0 +1,52 @@
+<?php declare(strict_types=1);
+
+namespace Pdsinterop\Solid\Auth\Enum;
+
+use ReflectionClass;
+
+abstract class AbstractEnum
+{
+    ////////////////////////////// CLASS PROPERTIES \\\\\\\\\\\\\\\\\\\\\\\\\\\\
+
+    private static $instance;
+
+    //////////////////////////// GETTERS AND SETTERS \\\\\\\\\\\\\\\\\\\\\\\\\\\
+
+    private static function getInstance() : AbstractEnum
+    {
+        $classname = static::class;
+
+        if (self::$instance[$classname] === null) {
+            self::$instance[$classname] = new $classname;
+        }
+
+        return self::$instance[$classname];
+    }
+
+    final public function getValues() : array
+    {
+        static $values;
+
+        if ($values === null) {
+            $reflectionClass = new ReflectionClass(static::class);
+
+            $values = array_values($reflectionClass->getConstants());
+
+            natcasesort($values);
+        }
+
+        return $values;
+    }
+
+    //////////////////////////////// PUBLIC API \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
+
+    final public static function has($value) : bool
+    {
+        return self::getInstance()->hasValue($value);
+    }
+
+    final public function hasValue($value) : bool
+    {
+        return in_array($value, $this->getValues(), true);
+    }
+}