rwachtler / grocomat

Final example for database applications.

Grocomat

Assumptions

1. Shopping List generator with price optimization*
2. Each Item has a Name and an EAN Code

• The Name may be the same
• The EAN Code is unique
• One Item can have 0:n categories

3. Stores are selling Items

• Each Store has a unique name
• The prices for the same Item may vary between the stores
• Not every store has the same Items

Shopping list

1. A shopping list may contain

• The EAN Code
• The Name of the Product
• Product category

2. It can also contain Items that are not available in any store.—> Mark them at the output.
3. The shopping list class should compute the cheapest possible way to buy all things on it.
4. A shopping list considers just a few stores.
5. Example

• Shoppinglist
  • Mars
  • Bread
  • Meat
  • 08154711007

Shopping list logic

1. Always priorize: EAN, Name, Category
2. If EAN:
   • Search in selected stores for the product and pick the cheapest one.
3. If Name:
   • Find stores that are selling products that have this name.
   • Pick the cheapest store.
4. If Category:
   • Find all Products with this category
   • Search in all stores for all found products
   • Pick the cheapest one

Functional requirements

1. Implement persistence

• Stores, Prices, Items and Categories have to be persistable in a Database (via Hibernate, JDBC or OrientDB) → ShoppingTester.testPersistence()
• Everything should run from an empty database (so the startup script or schema-generation-scripts have to be placed somewhere within your code)

2. Extend the ShoppingList class

• Add unimplemented methods (and Logic)