erp5_catalog: Refactor _catalogObject List to remove the need to copy and patch

Create FilterDict and Filter class which would be used to imitate the behaviour
of filter_dict for Catalog.

product/ZSQLCatalog/SQLCatalog.py

@@ -737,10 +737,11 @@ class Catalog(Folder,
         f.write('  </property>\n')
     # XXX Although filters are not properties, output filters here.
     # XXX Ideally, filters should be properties in Z SQL Methods, shouldn't they?
-    if hasattr(self, 'filter_dict'):
+    filter_dict = self._getFilterDict()
+    if filter_dict:
       filter_list = []
-      for filter_id in self.filter_dict.keys():
-        filter_definition = self.filter_dict[filter_id]
+      for filter_id in filter_dict.keys():
+        filter_definition = filter_dict[filter_id]
         filter_list.append((filter_id, filter_definition))
       # Sort for easy diff
       filter_list.sort(key=lambda x: x[0])
@@ -1601,7 +1602,7 @@ class Catalog(Folder,
 
     with (noReadOnlyTransactionCache if disable_cache else
           readOnlyTransactionCache)():
-      filter_dict = self.filter_dict
+      filter_dict = self._getFilterDict()
       catalogged_object_list_cache = {}
       for method_name in method_id_list:
         # We will check if there is an filter on this
@@ -1697,7 +1698,10 @@ class Catalog(Folder,
   if psyco is not None:
     psyco.bind(_catalogObjectList)
 
-  def _getCatalogMethodArgumentList(self, method):
+  def _getFilterDict(self):
+    return self.filter_dict
+
+  def _getCatalogMethodArgumentList(self, method_name):
     if method.meta_type in ("Z SQL Method", "LDIF Method"):
       # Build the dictionnary of values
       return method.arguments_src.split()