feat: adds getters for getting a book by id, deleting a book by id and creating a new book.

Author: Dlafferty251

lesson_26/api/java/api_app/src/main/java/com/codedifferently/lesson26/web/MediaItemsController.java

@@ -4,18 +4,23 @@
 import com.codedifferently.lesson26.library.Library;
 import com.codedifferently.lesson26.library.MediaItem;
 import com.codedifferently.lesson26.library.search.SearchCriteria;
+import jakarta.validation.Valid;
 import java.io.IOException;
 import java.util.List;
 import java.util.Set;
+import java.util.UUID;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
+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.RestController;
 
 @RestController
 @CrossOrigin
 public class MediaItemsController {
-
   private final Library library;
   private final Librarian librarian;
 
@@ -31,4 +36,44 @@ public ResponseEntity<GetMediaItemsResponse> getItems() {
     var response = GetMediaItemsResponse.builder().items(responseItems).build();
     return ResponseEntity.ok(response);
   }
+ 
+  @GetMapping("/items/{id}")
+  public ResponseEntity<MediaItemResponse> getItemById(@PathVariable UUID id) {
+    SearchCriteria criteria = SearchCriteria.builder().id(id.toString()).build();
+    Set<MediaItem> items = library.search(criteria);
+
+    if (items.isEmpty()) {
+      return ResponseEntity.notFound().build();
+    } else {
+      MediaItem item = items.iterator().next();
+      MediaItemResponse response = MediaItemResponse.from(item);
+      return ResponseEntity.ok(response);
+    }
+  }
+
+  @PostMapping("/items")
+  public CreateMediaItemResponse addItem(@Valid @RequestBody CreateMediaItemRequest request) {
+    MediaItemRequest itemCreation = request.getItem();
+    MediaItem item = MediaItemRequest.asMediaItem(itemCreation);
+    library.addMediaItem(item, librarian);
+
+    CreateMediaItemResponse response =
+        CreateMediaItemResponse.builder().item(getItemById(item.getId()).getBody()).build();
+    return response;
+  }
+
+  @DeleteMapping("/items/{id}")
+  public ResponseEntity<Void> deleteItem(@PathVariable UUID id) {
+    SearchCriteria criteria = SearchCriteria.builder().id(id.toString()).build();
+    Set<MediaItem> items = library.search(criteria);
+
+    if (items.isEmpty()) {
+      return ResponseEntity.notFound().build();
+    } else {
+      MediaItem item = items.iterator().next();
+      library.removeMediaItem(item, librarian);
+
+      return ResponseEntity.noContent().build();
+    }
+  }
 }