[Zope3-checkins] SVN: Zope3/trunk/src/zope/app/traversing/ Added ++adapter++ traversal namespace.

[Jim Fulton]

Log message for revision 25166:
Added ++adapter++ traversal namespace.  

It traverses by getting named adapters to 
IPathAdapter.




-=-
Modified: Zope3/trunk/src/zope/app/traversing/configure.zcml
===================================================================
--- Zope3/trunk/src/zope/app/traversing/configure.zcml	2004-06-01 21:54:23 UTC (rev 25165)
+++ Zope3/trunk/src/zope/app/traversing/configure.zcml	2004-06-01 22:51:08 UTC (rev 25166)
@@ -40,6 +40,18 @@
     />
 
 <adapter
+    name="adapter"
+    provides="zope.app.traversing.interfaces.ITraversable" for="*"
+    factory="zope.app.traversing.namespace.adapter" 
+    />
+<view
+    name="adapter"
+    type="zope.interface.Interface"
+    provides="zope.app.traversing.interfaces.ITraversable" for="*"
+    factory="zope.app.traversing.namespace.adapter" 
+    />
+
+<adapter
     name="item"
     provides="zope.app.traversing.interfaces.ITraversable" for="*"
     factory="zope.app.traversing.namespace.item" 

Modified: Zope3/trunk/src/zope/app/traversing/interfaces.py
===================================================================
--- Zope3/trunk/src/zope/app/traversing/interfaces.py	2004-06-01 21:54:23 UTC (rev 25165)
+++ Zope3/trunk/src/zope/app/traversing/interfaces.py	2004-06-01 22:51:08 UTC (rev 25166)
@@ -193,3 +193,6 @@
         Raises ValueError if a badly formed path is given.
         """
 
+class IPathAdapter(Interface):
+    """Marker interface for adapters to be used in paths
+    """

Modified: Zope3/trunk/src/zope/app/traversing/namespace.py
===================================================================
--- Zope3/trunk/src/zope/app/traversing/namespace.py	2004-06-01 21:54:23 UTC (rev 25165)
+++ Zope3/trunk/src/zope/app/traversing/namespace.py	2004-06-01 22:51:08 UTC (rev 25166)
@@ -20,7 +20,7 @@
 from zope import component
 from zope.component.servicenames import Presentation
 from zope.exceptions import NotFoundError
-from zope.app.traversing.interfaces import ITraversable
+from zope.app.traversing.interfaces import ITraversable, IPathAdapter
 from zope.proxy import removeAllProxies
 
 class UnexpectedParameters(NotFoundError):
@@ -388,3 +388,43 @@
         request.setVirtualHostRoot(app_names)
 
         return self.context
+
+
+class adapter(SimpleHandler):
+
+    def traverse(self, name, ignored):
+        """Adapter traversal adapter
+
+           This adapter provides traversal to named adapters registered to
+           provide IPathAdapter.
+
+           To demonstrate this, we need to register some adapters:
+
+             >>> from zope.app.tests.placelesssetup import setUp, tearDown
+             >>> setUp()
+             >>> from zope.app.tests import ztapi
+             >>> def adapter1(ob):
+             ...     return 1
+             >>> def adapter2(ob):
+             ...     return 2
+             >>> ztapi.provideAdapter(None, IPathAdapter, adapter1, 'a1')
+             >>> ztapi.provideAdapter(None, IPathAdapter, adapter2, 'a2')
+
+           Now, with these adapters in place, we can use the traversal adapter:
+
+             >>> ob = object()
+             >>> adapter = adapter(ob)
+             >>> adapter.traverse('a1', ())
+             1
+             >>> adapter.traverse('a2', ())
+             2
+             >>> try:
+             ...     adapter.traverse('bob', ())
+             ... except NotFoundError:
+             ...     print 'no adapter'
+             no adapter
+           """
+        try:
+            return component.getAdapter(self.context, IPathAdapter, name=name)
+        except:
+            raise NotFoundError(self.context, name)