[hdf5tomoscan] convert to static method for re-usability

tomoscan/esrf/hdf5scan.py

@@ -615,13 +615,19 @@ class HDF5TomoScan(TomoScanBase):
         else:
             return None
 
-    def _get_compacted_projections(self):
+    @staticmethod
+    def _get_compacted_projections(projections):
         """
         Regroup urls to get the data more efficiently.
         Build a structure mapping projections indices to information on
         how to load the data: `{indices_set: data_location}`
         where `data_location` contains contiguous indices.
 
+        Parameters
+        -----------
+        projections: dict
+            Dictionary where the key is an integer and the value is a silx `DataUrl`.
+
         Returns
         --------
         merged_projections: dict
@@ -645,9 +651,9 @@ class HDF5TomoScan(TomoScanBase):
         def merge_slices(slice1, slice2):
             return slice(slice1.start, slice2.stop)
 
-        sorted_files_indices = sorted(self.projections.keys())
+        sorted_files_indices = sorted(projections.keys())
         idx0 = sorted_files_indices[0]
-        first_url = self.projections[idx0]
+        first_url = projections[idx0]
 
         merged_indices = [
             [idx0]
@@ -662,7 +668,7 @@ class HDF5TomoScan(TomoScanBase):
         pos = 0
         curr_fp, curr_dp, curr_slice = data_location[pos]
         for idx in sorted_files_indices[1:]:
-            url = self.projections[idx]
+            url = projections[idx]
             next_slice = _convert_to_slice(url.data_slice())
             if (url.file_path() == curr_fp) and (url.data_path() == curr_dp) and is_contiguous_slice(curr_slice, next_slice):
                 merged_indices[pos].append(idx)
@@ -695,7 +701,7 @@ class HDF5TomoScan(TomoScanBase):
             is the corresponding `silx.io.url.DataUrl` with merged data_slice
         """
         if self._projections_compacted is None:
-            self._projections_compacted = self._get_compacted_projections()
+            self._projections_compacted = self._get_compacted_projections(self.projections)
         return self._projections_compacted
 
     def __str__(self):