public void modifyClasses(ClassCollection collection, DeltaModule delta) {

    List<ClassModification> modifiesClasses = DeltaJUtils.getDeltaModifies(delta);
    for (ClassModification modifiesClass : modifiesClasses) {
      Class classToModify = DeltaJUtils.classByName(collection, modifiesClass.getName());
      if (classToModify != null) modifyClass(classToModify, modifiesClass);
    }
  }