[Zodb-checkins] CVS: Zope3/lib/python/Interface/Registry - AdapterRegistry.py:1.2.8.2 IAdapterRegistry.py:1.2.8.2 _flatten.py:1.1.8.1

[Jim Fulton]

Update of /cvs-repository/Zope3/lib/python/Interface/Registry
In directory cvs.zope.org:/tmp/cvs-serv11955/lib/python/Interface/Registry

Modified Files:
      Tag: Zope3-Bangalore-TTW-Branch
	AdapterRegistry.py IAdapterRegistry.py _flatten.py 
Log Message:

- Added a filter option to get and getForObject. This will be
  needed for placeful adapter service implementations.

- Added tests for getForObject.

- Fixed a logic error in get.



=== Zope3/lib/python/Interface/Registry/AdapterRegistry.py 1.2.8.1 => 1.2.8.2 ===
--- Zope3/lib/python/Interface/Registry/AdapterRegistry.py:1.2.8.1	Tue Oct 15 10:41:30 2002
+++ Zope3/lib/python/Interface/Registry/AdapterRegistry.py	Wed Oct 16 04:35:35 2002
@@ -77,24 +77,25 @@
         
         self._registerAllProvided(require, provide, object, provide)
 
-    def get(self, (ob_interface, provide), default=None):
+    def get(self, (ob_interface, provide), default=None, filter=None):
         """
         Finds a registered component that provides the given interface.
         Returns None if not found.
         """
-        for interface in _flatten(ob_interface):
+        for interface in _flatten(ob_interface, 1):
             c = self._reg.get((interface, provide))
             if c:
-                return c[1]
+                c = c[1]
+                if filter is None:
+                    return c
+                if filter(c):
+                    return c
 
-        c = self._reg.get((None, provide), default)
-        if c:
-            return c[1]
+        return default
 
-        return c
-
-    def getForObject(self, object, interface):
-        return self.get((getattr(object, '__implements__', None), interface))
+    def getForObject(self, object, interface, filter=None):
+        return self.get((getattr(object, '__implements__', None), interface),
+                        filter=filter)
 
     def getRegistered(self, require, provide):
         data = self._reg.get((require, provide))


=== Zope3/lib/python/Interface/Registry/IAdapterRegistry.py 1.2.8.1 => 1.2.8.2 ===
--- Zope3/lib/python/Interface/Registry/IAdapterRegistry.py:1.2.8.1	Tue Oct 15 10:41:30 2002
+++ Zope3/lib/python/Interface/Registry/IAdapterRegistry.py	Wed Oct 16 04:35:35 2002
@@ -50,7 +50,7 @@
 
         """
 
-    def get((implements, provides), default=None):
+    def get((implements, provides), default=None, filter=None):
         """Return a registered object
 
         The registered object is one that was registered to require an
@@ -65,10 +65,19 @@
         Note that the implements may be None, it which case a
         component will be returned only if it was registered with a
         require of None.
+
+        An optional filter may be provided. If provided, the returned
+        object must pass the filter. Search will continue until a
+        suitable match can be found. The filter should take a single
+        argument and return a true value if the object passes the
+        filter, or false otherwise.
+        
         """
     
-    def getForObject(object, interface):
+    def getForObject(object, interface, filter=None):
         """Get an adapter for object that implements the specified interface
+
+        The filter option has the same meaning as in the get method.
         """
 
     def getRegistered(require, provide):


=== Zope3/lib/python/Interface/Registry/_flatten.py 1.1 => 1.1.8.1 ===
--- Zope3/lib/python/Interface/Registry/_flatten.py:1.1	Thu Aug  1 11:33:43 2002
+++ Zope3/lib/python/Interface/Registry/_flatten.py	Wed Oct 16 04:35:35 2002
@@ -21,7 +21,7 @@
 
 from Interface import Interface
 
-def _flatten(implements):
+def _flatten(implements, include_None=0):
     """Flatten an implements spec to a list of interfaces
 
     The list includes all base interfaces of the interface(s) in
@@ -39,6 +39,9 @@
             seen[interface] = 1
             flattened.append(interface)
     flattened.reverse()
+
+    if include_None:
+        flattened.append(None)
 
     return flattened