Protected member access via reflection

at 2010-04-04 in 5.8-SERIES by friebe (0 comments)

The next major XP Framework series, 5.8, now allows invoking protected methods reflectively:

  class Invoke extends Object {
    
    protected function target() {
      Console::writeLine('Invoked');
    }
    
    public function run() {
      $this->getClass()->getMethod('target')->invoke($this);
    }
    
    public static function main(array $args) {
      create(new self())->run();
    }
  }

In the 5.7-SERIES, this would raise a lang.reflect.TargetInvocationException; whereas now it prints "Invoked" to the console as expected.

The same works for (static and non-static) fields as well as constructors seamlessly if inside the same class or a subclass. To invoke protected methos and/or read or write protected fields of any class, use the setAccessible() method provided in the Field, Method and Constructor classes:

  public function dump(Generic $instance) {
    Console::writeLine($instance->getClass(), ' {');
    foreach ($instance->getClass()->getFields() as $field) {
      Console::write('  [', $field->getName(), '] ');
      Console::writeLine($field->setAccessible(TRUE)->get($instance));
    }
    Console::writeLine('}');
  }

Note: This feature does not rely on PHP 5.3 but utilizes __get() / __set() magic interceptors

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Protected member access via reflection

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