update a bit, but still in draft.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30758 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/mixin/solver.py

@@ -5,10 +5,10 @@
 #                    Jean-Paul Smets-Solanes <jp@nexedi.com>
 #
 # WARNING: This program as such is intended to be used by professional
-# programmers who take the whole responsability of assessing all potential
+# programmers who take the whole responsibility of assessing all potential
 # consequences resulting from its eventual inadequacies and bugs
 # End users who are looking for a ready-to-use solution with commercial
-# garantees and support are strongly adviced to contract a Free Software
+# guarantees and support are strongly adviced to contract a Free Software
 # Service Company
 #
 # This program is Free Software; you can redistribute it and/or
@@ -23,12 +23,23 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 ##############################################################################
 
+import zope.interface
+from AccessControl import ClassSecurityInfo
+from Products.ERP5Type import Permissions, interfaces
 
 class SolverMixin:
   """
+  Provides generic methods and helper methods to implement ISolver.
   """
-  # Placeholder - will implement isSolving etc.
+  # Declarative security
+  security = ClassSecurityInfo()
+  security.declareObjectProtected(Permissions.AccessContentsInformation)
+
+  # Declarative interfaces
+  zope.interface.implements(interfaces.ISolver,)
+
+  # Implementation of ISolver