add transition event

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2559 fd906abe-77d9-0310-91a1-e0d9ade77398

stateful/base.py

@@ -24,10 +24,11 @@ $Id$
 
 from persistent.interfaces import IPersistent
 from persistent.mapping import PersistentMapping
+from zope import component
 from zope.component import adapts
 from zope.interface import implements
 
-from cybertools.stateful.interfaces import IStateful
+from cybertools.stateful.interfaces import IStateful, IStatefulIndexInfo
 from cybertools.stateful.definition import statesDefinitions
 
 
@@ -94,3 +95,19 @@ class StatefulAdapter(Stateful):
         statesAttr[self.statesDefinition] = value
     state = property(getState, setState)
 
+
+class IndexInfo(object):
+
+    implements(IStatefulIndexInfo)
+
+    availableStatesDefinitions = []     # to be overwritten by subclass!
+
+    def __init__(self, context):
+        self.context = context
+
+    @property
+    def tokens(self):
+        for std in self.availableStatesDefinitions:
+            stf = component.getAdapter(self.context, IStateful, name=std)
+            yield ':'.join((std, stf.state))
+

stateful/definition.py

@@ -107,6 +107,7 @@ class TransitionEvent(ObjectEvent):
         self.transition = transition
         self.previousState = previousState
 
+
 # dummy default states definition
 
 defaultSD = StatesDefinition('default',

stateful/interfaces.py

@@ -113,6 +113,18 @@ class IStatesDefinition(Interface):
         """
 
 
+class IStatefulIndexInfo(Interface):
+    """ Provide a list of tokens to be used for index the states
+        of an object in the catalog.
+    """
+
+    tokens = Attribute('A sequence of strings to be used for indexing the '
+                'states; format: [<statesdefinition name>:<state name>, ...].')
+
+    availableStatesDefinitions = Attribute('A sequence of strings with the '
+                'names of all states definitions currently available.')
+
+
 class ITransitionEvent(IObjectEvent):
     """ Fires when the state of an object is changed.
     """