Add picture format control.

codiki-application/src/main/java/org/codiki/application/picture/PictureUseCases.java

@@ -4,6 +4,7 @@ import java.io.File;
 import java.util.UUID;
 
 import static org.codiki.domain.picture.model.builder.PictureBuilder.aPicture;
+import org.codiki.domain.picture.exception.PictureNotFoundException;
 import org.codiki.domain.picture.model.Picture;
 import org.codiki.domain.picture.port.PicturePort;
 import org.springframework.stereotype.Service;
@@ -30,4 +31,9 @@ public class PictureUseCases {
     public void deletePicture(UUID pictureId) {
         picturePort.deleteById(pictureId);
     }
+
+    public Picture findById(UUID pictureId) {
+        return picturePort.findById(pictureId)
+            .orElseThrow(() -> new PictureNotFoundException(pictureId));
+    }
 }