JobOfPresenter.java

class RecipePresenter {
  Model model;
  View view;
  List<Recipe> list;
  RecipeData data;
  // Make the constructor here and initialize the model and view
  
  /* First and second role of presenter- asking model for data  
  on button click. Caching the recipes in 'data' variable and 
  then sending the results back */
  void loadRecipes() {
    try {
      list = model.onLoadRecipes();
      data.setRecipesList(list);
    } catch (UpgradeAccountException exception) {
      data.setError(true);
    }
    view.updateUI(data);
  }
  // Third role of presenter - transform data
  void loadFilterRecipe() {
    List<Recipe> filterList = list.someFilter();
    data.setRecipesList(filterList);
    view.updateUI(data);
  }
}