moved tests performed in __init__ to load()

bob/io/stream/stream.py

@@ -688,27 +688,6 @@ class StreamView(StreamFilter):
                 + "."
             )
 
-        if not all(self.shape):  # true if a dimension in shape is 0: resulting stream has no data.
-            if not all(self.shape):
-                raise ValueError(
-                    str(view_indices)
-                    + " in stream with shape "
-                    + str(parent.shape)
-                    + " results in empty stream. (shape "
-                    + str(self.shape)
-                    + ")"
-                )
-
-        # If slice operates on more dimension than available.
-        if self.bulk_view is not None and self.parent.ndim <= len(self.bulk_view):
-            raise ValueError(
-                "Got "
-                + str(len(self.bulk_view) + 1)
-                + " indices for stream with shape "
-                + str(self.parent.shape)
-                + ". Too many indices !"
-            )
-
     # shape property
     @property
     def shape(self):
@@ -774,6 +753,26 @@ class StreamView(StreamFilter):
         :obj:`numpy.ndarray`
             Data at `index` in the stream.
         """
+        if not all(self.shape):  # true if a dimension in shape is 0: resulting stream has no data.
+            raise ValueError(
+                str(view_indices)
+                + " in stream with shape "
+                + str(parent.shape)
+                + " results in empty stream. (shape "
+                + str(self.shape)
+                + ")"
+            )
+            
+        # If slice operates on more dimension than available.
+        if self.bulk_view is not None and self.parent.ndim <= len(self.bulk_view):
+            raise ValueError(
+                "Got "
+                + str(len(self.bulk_view) + 1)
+                + " indices for stream with shape "
+                + str(self.parent.shape)
+                + ". Too many indices !"
+            )
+
         parent_indices = get_index_list(self.frame_view, self.parent.shape[0])
         view_indices = get_index_list(index, self.shape[0])
         indices = [parent_indices[i] for i in view_indices]