--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hooks/storages.py	Fri Jan 22 08:49:16 2010 +0100
@@ -0,0 +1,45 @@
+"""hooks to handle attributes mapped to a custom storage
+"""
+from os import unlink
+
+from cubicweb.server.hook import Hook
+from cubicweb.server.sources.storages import ETYPE_ATTR_STORAGE
+
+
+class BFSSHook(Hook):
+    """abstract class for bytes file-system storage hooks"""
+    __abstract__ = True
+    category = 'bfss'
+
+
+class PreAddEntityHook(BFSSHook):
+    """"""
+    __regid__ = 'bfss_add_entity'
+    events = ('before_add_entity', )
+    #__select__ = Hook.__select__ & implements('Repository')
+
+    def __call__(self):
+        for attr in ETYPE_ATTR_STORAGE.get(self.entity.__regid__, ()):
+            fpath = ETYPE_ATTR_STORAGE[self.entity.__regid__][attr].entity_added(self.entity, attr)
+            if fpath is not None:
+                AddFileOp(filepath=fpath)
+
+class PreUpdateEntityHook(BFSSHook):
+    """"""
+    __regid__ = 'bfss_update_entity'
+    events = ('before_update_entity', )
+    #__select__ = Hook.__select__ & implements('Repository')
+
+    def __call__(self):
+        for attr in ETYPE_ATTR_STORAGE.get(self.entity.__regid__, ()):
+            ETYPE_ATTR_STORAGE[self.entity.__regid__][attr].entity_updated(self.entity, attr)
+
+class PreDeleteEntityHook(BFSSHook):
+    """"""
+    __regid__ = 'bfss_delete_entity'
+    events = ('before_delete_entity', )
+    #__select__ = Hook.__select__ & implements('Repository')
+
+    def __call__(self):
+        for attr in ETYPE_ATTR_STORAGE.get(self.entity.__regid__, ()):
+            ETYPE_ATTR_STORAGE[self.entity.__regid__][attr].entity_deleted(self.entity, attr)