address CR comments

src/histolab/tiler.py

@@ -164,7 +164,7 @@ def _tile_filename(
     def _tiles_generator(self, slide: Slide) -> None:
         raise NotImplementedError
 
-    def _validate_levels(self, slide: Slide) -> None:
+    def _validate_level(self, slide: Slide) -> None:
         """Validate the Tiler's level according to the Slide.
 
         Parameters
@@ -174,8 +174,6 @@ def _validate_levels(self, slide: Slide) -> None:
 
         Raises
         ------
-        TileSizeError
-            If the tile size is larger than the slide size
         LevelError
             If the level is not available for the slide
         """
@@ -185,6 +183,19 @@ def _validate_levels(self, slide: Slide) -> None:
                 f"{len(slide.levels)}"
             )
 
+    def _validate_tile_size(self, slide: Slide) -> None:
+        """Validate the tile size according to the Slide.
+
+        Parameters
+        ----------
+        slide : Slide
+            Slide from which to extract the tiles
+
+        Raises
+        ------
+        TileSizeError
+            If the tile size is larger than the slide size
+        """
         if not self._has_valid_tile_size(slide):
             raise TileSizeError(
                 f"Tile size {self.tile_size} is larger than slide size "
@@ -252,7 +263,8 @@ def extract(self, slide: Slide) -> None:
         LevelError
             If the level is not available for the slide
         """
-        self._validate_levels(slide)
+        self._validate_level(slide)
+        self._validate_tile_size(slide)
 
         grid_tiles = self._tiles_generator(slide)
 
@@ -477,7 +489,8 @@ def extract(self, slide: Slide) -> None:
         LevelError
             If the level is not available for the slide
         """
-        self._validate_levels(slide)
+        self._validate_level(slide)
+        self._validate_tile_size(slide)
 
         random_tiles = self._tiles_generator(slide)
 
@@ -673,7 +686,8 @@ def extract(self, slide: Slide, report_path: str = None) -> None:
         LevelError
             If the level is not available for the slide
         """
-        self._validate_levels(slide)
+        self._validate_level(slide)
+        self._validate_tile_size(slide)
 
         highest_score_tiles, highest_scaled_score_tiles = self._tiles_generator(slide)