Consolidate more shared behavior across TraversableResourceLoaders.

Author: jaraco

importlib_resources/future/adapters.py

@@ -11,7 +11,7 @@
 from .. import readers, _adapters
 
 
-class TraversableResourcesLoader:
+class TraversableResourcesLoader(_adapters.TraversableResourcesLoader):
     """
     Adapt loaders to provide TraversableResources and other
     compatibility.
@@ -20,9 +20,6 @@ class TraversableResourcesLoader:
     loaders do not yet implement TraversableResources.
     """
 
-    def __init__(self, spec):
-        self.spec = spec
-
     @property
     def path(self):
         return self.spec.origin
@@ -36,14 +33,6 @@ def _namespace_reader(spec):
             with suppress(AttributeError, ValueError):
                 return readers.NamespaceReader(spec.submodule_search_locations)
 
-        def _available_reader(spec):
-            with suppress(AttributeError):
-                return spec.loader.get_resource_reader(spec.name)
-
-        def _native_reader(spec):
-            reader = _available_reader(spec)
-            return reader if hasattr(reader, 'files') else None
-
         def _file_reader(spec):
             try:
                 path = pathlib.Path(self.path)
@@ -62,11 +51,8 @@ def _file_reader(spec):
             # local FileReader
             _file_reader(self.spec)
             or
-            # native reader if it supplies 'files'
-            _native_reader(self.spec)
-            or
-            # fallback - adapt the spec ResourceReader to TraversableReader
-            _adapters.CompatibilityFiles(self.spec)
+            # fallback
+            super().get_resource_reader(name)
         )