PHP7 Visitor

Behavioral/Visitor/Role.php

@@ -2,32 +2,7 @@
 
 namespace DesignPatterns\Behavioral\Visitor;
 
-/**
- * class Role.
- */
-abstract class Role
+interface Role
 {
-    /**
-     * This method handles a double dispatch based on the short name of the Visitor.
-     *
-     * Feel free to override it if your object must call another visiting behavior
-     *
-     * @param \DesignPatterns\Behavioral\Visitor\RoleVisitorInterface $visitor
-     *
-     * @throws \InvalidArgumentException
-     */
-    public function accept(RoleVisitorInterface $visitor)
-    {
-        // this trick to simulate double-dispatch based on type-hinting
-        $klass = get_called_class();
-        preg_match('#([^\\\\]+)$#', $klass, $extract);
-        $visitingMethod = 'visit'.$extract[1];
-
-        // this ensures strong typing with visitor interface, not some visitor objects
-        if (!method_exists(__NAMESPACE__.'\RoleVisitorInterface', $visitingMethod)) {
-            throw new \InvalidArgumentException("The visitor you provide cannot visit a $klass instance");
-        }
-
-        call_user_func(array($visitor, $visitingMethod), $this);
-    }
+    public function accept(RoleVisitorInterface $visitor);
 }