feat: implement api

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

@@ -0,0 +1,57 @@
+package com.codedifferently.lesson26.web;
+
+import com.codedifferently.lesson26.library.Librarian;
+import com.codedifferently.lesson26.library.Library;
+import com.codedifferently.lesson26.library.search.SearchCriteria;
+import jakarta.validation.Valid;
+import java.util.UUID;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/items")
+@CrossOrigin
+public class MediaItemController {
+
+  private final Library library;
+  private final Librarian librarian;
+
+  public MediaItemController(Library library, Librarian librarian) {
+    this.library = library;
+    this.librarian = librarian;
+  }
+
+  @GetMapping
+  public GetMediaItemsResponse getItems() {
+    var items = library.search(SearchCriteria.builder().build());
+    var responseItems = items.stream().map(MediaItemResponse::from).toList();
+    return GetMediaItemsResponse.builder().items(responseItems).build();
+  }
+
+  @GetMapping("/{id}")
+  public ResponseEntity<MediaItemResponse> getItemById(@PathVariable UUID id) {
+    var criteria = SearchCriteria.builder().id(id.toString()).build();
+    var results = library.search(criteria);
+    return results.isEmpty()
+        ? ResponseEntity.notFound().build()
+        : ResponseEntity.ok(MediaItemResponse.from(results.iterator().next()));
+  }
+
+  @PostMapping
+  public CreateMediaItemResponse addItem(@Valid @RequestBody CreateMediaItemRequest request) {
+    var item = MediaItemRequest.asMediaItem(request.getItem());
+    library.addMediaItem(item, librarian);
+    var response = getItemById(item.getId()).getBody();
+    return CreateMediaItemResponse.builder().item(response).build();
+  }
+
+  @DeleteMapping("/{id}")
+  public ResponseEntity<Void> deleteItem(@PathVariable UUID id) {
+    var criteria = SearchCriteria.builder().id(id.toString()).build();
+    var results = library.search(criteria);
+    if (results.isEmpty()) return ResponseEntity.notFound().build();
+
+    library.removeMediaItem(results.iterator().next(), librarian);
+    return ResponseEntity.noContent().build();
+  }
+}