Added application layer and blockchain implementation

src/main/java/com/rviewer/skeletons/application/adapter/CartController.java

@@ -0,0 +1,70 @@
+package com.rviewer.skeletons.application.adapter;
+
+import com.rviewer.skeletons.application.exception.CartAlreadyExistsException;
+import com.rviewer.skeletons.application.exception.CartNotFoundException;
+import com.rviewer.skeletons.domain.model.Cart;
+import com.rviewer.skeletons.domain.model.Item;
+import com.rviewer.skeletons.domain.service.CartService;
+import com.rviewer.skeletons.application.request.CreateCartReq;
+import com.rviewer.skeletons.application.request.UpdateCartReq;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.validation.Valid;
+import java.util.UUID;
+
+@RestController
+@RequestMapping("/carts")
+public class CartController {
+
+    private final CartService cartService;
+
+    public CartController(CartService cartService) {
+        this.cartService = cartService;
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<Cart> getCart(@PathVariable String id) {
+        return ResponseEntity.status(HttpStatus.OK).body(cartService.get(id).orElseThrow(CartNotFoundException::new));
+    }
+
+    @PostMapping("/{id}")
+    public ResponseEntity<HttpStatus> saveCart(@PathVariable String id, @Valid @RequestBody CreateCartReq createCartReq) {
+        if (cartService.get(id).isPresent()) {
+            throw new CartAlreadyExistsException();
+        } else {
+            cartService.save(new Cart(UUID.fromString(id), createCartReq.getItems()
+                    .stream()
+                    .map(item -> new Item(item.getId(), item.getName(), item.getQuantity(), item.getPrice()))
+                    .toList()));
+            return ResponseEntity.status(HttpStatus.CREATED).build();
+        }
+    }
+
+    @PatchMapping("/{id}")
+    public ResponseEntity<HttpStatus> updateCart(@PathVariable String id, @Valid @RequestBody UpdateCartReq updateCartReq) {
+        Cart cart = cartService.get(id).orElseThrow(CartNotFoundException::new);
+        cart.setItems(updateCartReq.getItems());
+        cartService.save(cart);
+        return ResponseEntity.status(HttpStatus.OK).build();
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<HttpStatus> deleteCart(@PathVariable String id) {
+        if (cartService.get(id).isEmpty()) {
+            throw new CartNotFoundException();
+        } else {
+            cartService.delete(id);
+            return ResponseEntity.status(HttpStatus.OK).build();
+        }
+    }
+
+}