Write an application to manage a diet by means of nutritional values computation.
The application must allow the definition of raw materials, their use as ingredients for recipes, the definition of products and menus.
All the classes must be in the package "diet".
The system works though the facade class Food.
To define a raw material, we can use the method defineRawMaterial() that accepts as arguments the name, the kilo-calories, the amount of proteins, carbohydrates (carbs), and fat; all the values refer to 100 grams of raw material. The name of the raw material can be considered unique.
To retrieve some information about the raw materials we can use the method rawMaterials() which returns a list of raw materials, sorted by name in alphabetic order. To get info about a specific material, we can use the method getRawMaterial() that accepts the name of the raw material and returns the corresponding raw material.
The raw materials returned by the above methods are objects implementing the interface NutritionalElement, which provides the getter methods getName(), getCalories(), getProteins(), getCarbs(), getFat(). Calories are expressed in KCal, while proteins, carbs, and fat are expressed in grams.
Moreover the interface includes the method per100g() that indicates whether the values
refer to 100 grams of nutritional element or represent an absolute value. For raw materials
the nutritional values are always expressed per 100 grams, therefore the method returns true.
The diet may include also pre-packaged products (e.g. an ice cream or a snack).
Products are defined by means of the method defineProduct() of class Food
accepting as arguments the name, the kilo-calories, the amount of proteins, carbohydrates (carbs), and fat.
Such values express the value for the whole product, therefore the method per100g() returns false.
The name of the product can be considered unique.
To retrieve information about the products we can use the method products() of class Food that returns a collection of products sorted by name. To get information about a specific product, method getProduct() is available that accepts the name of the product and returns the corresponding object.
Both methods return the products as object implementing the interface NutritionalElement (described in the previous requirement); the values are expressed for the whole product (i.e. the method per100g() returns false).
Raw materials can be combined as ingredients of recipes. To define a recipe we can use the method createRecipe(), from class Food, that accepts as argument the name of the recipe. The name of the recipe can be considered unique.
A recipe is represented by an object of class Recipe that allows adding new ingredients by means of its method addIngredient() accepting as arguments the name of the raw material and the relative amount in grams.
Class Recipe implements the interface NutritionalElement and the values are expressed per 100 grams.
To retrieve the information about the recipes we can use the method recipes(), of class Food, that returns a collection of recipes sorted by name. To get information regarding a specific recipe we can use the method getRecipe() that accepts as argument the name of the recipe and return the corresponding recipe. Both methods return recipes as NutritionalElement
A menu consists of either portions of recipes or pre-packaged products.
Menus can be create with method createMenu() of class Food, that accepts as argument the name of the menu.
A menu is represented by class Menu that allows to add a portion of a recipe to the menu through method addRecipe() that accepts as argument the name of the recipe and the size of the portion, in grams.
To add an item of a pre-packaged product, class Menu provides the method addProduct() that accepts as argument the name of the product.
Class Menu implements the NutritionalElement interface; in this case the values are referred to the whole menu.