cs Visitor

Visitor/Role.php

@@ -7,34 +7,34 @@ namespace DesignPatterns\Visitor;
  *
  * Purpose:
  * The Visitor Pattern lets you outsource operations on objects to other objects. The main reason to do this is to keep
- * a seperation of concerns. But classes have to define an contract to allow visitors (the "accept" method in the example below).
+ * a separation of concerns. But classes have to define an contract to allow visitors (the "accept" method in the example below).
  * 
  * The contract is an abstract class but you can have also a clean interface. 
- * In that case, each Visitee has to choose itself which method to invoke on the visitor.
+ * In that case, each Visitor has to choose itself which method to invoke on the visitor.
  */
 abstract class Role
 {
-
     /**
-     * This method handles a double dispatch based on the shortname of the Visitee
-     * 
+     * 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\Visitor\RoleVisitor $visitor
+     *
+     * @param \DesignPatterns\Visitor\RoleVisitorInterface $visitor
+     *
+     * @throws \InvalidArgumentException
      */
-    public function accept(RoleVisitor $visitor)
+    public function accept(RoleVisitorInterface $visitor)
     {
         // this trick to simulate double-dispatch based on type-hinting
-        $fqcn = get_called_class();
-        preg_match('#([^\\\\]+)$#', $fqcn, $extract);
+        $klass = get_called_class();
+        preg_match('#([^\\\\]+)$#', $klass, $extract);
         $visitingMethod = 'visit' . $extract[1];
 
         // this ensures strong typing with visitor interface, not some visitor objects
-        if (!method_exists(__NAMESPACE__ . '\RoleVisitor', $visitingMethod)) {
-            throw new \InvalidArgumentException("The visitor you provide cannot visit a $fqcn instance");
+        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);
     }
-
 }