add service

src/main/java/ntnu/idatt2016/v233/SmartMat/service/ShoppingListService.java

+package ntnu.idatt2016.v233.SmartMat.service;
+
+import java.util.List;
+import java.util.Optional;
+
+import ntnu.idatt2016.v233.SmartMat.model.ShoppingList;
+import ntnu.idatt2016.v233.SmartMat.repository.ShoppingListReposity;
+
+/**
+ * Service for the shopping list
+ * 
+ * @author Stian Lyng
+ * @version 1.0
+ */
+public class ShoppingListService {
+    
+    ShoppingListReposity shoppingListRepository;
+    /**
+     * Creates a new ShoppingListService
+     * 
+     * @param shoppingListRepository The repository to use
+     */
+    public ShoppingListService(ShoppingListReposity shoppingListRepository) {
+        this.shoppingListRepository = shoppingListRepository;
+    }
+    
+    /**
+     * Saves a shopping list to the database
+     * @param shoppingList the shopping list to save
+     * @return the saved shopping list
+     */
+    public ShoppingList saveShoppingList(ShoppingList shoppingList) {
+        return shoppingListRepository.save(shoppingList);
+    }
+
+    /**
+     * Gets a shopping list by its ID
+     * 
+     * @param id the ID of the shopping list
+     * @return an optional containing the shopping list if it exists
+     */
+    public Optional<ShoppingList> getShoppingListById(int id) {
+        return shoppingListRepository.getById(id);
+    }
+    
+    /**
+     * Gets a shopping list by its group ID
+     * 
+     * @param id the ID of the group
+     * @return an optional containing the shopping list if it exists
+     */
+    public Optional<ShoppingList> getShoppingListByGroupId(int id) {
+        return shoppingListRepository.getByGroupID(id);
+    }
+    
+    /**
+     * Gets all shopping lists
+     * 
+     * @return an optional containing a list of all shopping lists if they exist
+     */
+    public Optional<List<ShoppingList>> getAllShoppingLists() {
+        return shoppingListRepository.getAll();
+    } 
+    
+    /**
+     * Gets all shopping lists by group ID
+     * 
+     * @param id the ID of the group
+     * @return an optional containing a list of all shopping lists if they exist
+     */
+    public Optional<List<ShoppingList>> getAllShoppingListsByGroupId(int id) {
+        return shoppingListRepository.getAllByGroupID(id);
+    }
+
+    /**
+     * Deletes a shopping list by its ID
+     * 
+     * @param id the ID of the shopping list
+     */
+    public void deleteShoppingListById(int id) {
+        shoppingListRepository.deleteById(id);
+    }
+
+}