Retrieve metadata in Dartlang

metadata.dart

// Dart VM version: 1.13.0-dev.7.3 (Fri Oct 23 04:20:51 2015) on "windows_x64"
// https://www.dartlang.org/docs/dart-up-and-running/ch03.html#dartmirrors---reflection
// http://stackoverflow.com/questions/19492607/how-to-retrieve-metadata-in-dartlang
import 'dart:mirrors';

class todo {
  final String who;
  final String what;

  const todo(this.who, this.what);
}

@todo('akira', 'add something')
class Foo {
  @todo('naoto', 'do something')
  String fooVariable;

  @todo('kitano', 'change the name')
  void fooMethod() {

  }

  Foo() {
    ClassMirror cm = reflectClass(Foo);

    for (VariableMirror vm in cm.declarations.values.where((m) => m is VariableMirror)) {
      print(vm.metadata.first.reflectee.what);
    }

    for (MethodMirror vm in cm.declarations.values.where((m) => m is MethodMirror && !m.isConstructor)) {
      print(vm.metadata.first.reflectee.what);
    }
  }
}


void main() {
  Foo foo = new Foo();
}