[Zope3-checkins] CVS: Zope3/src/zope/app/services - configuration.py:1.6.4.1

[Tim Peters]

Update of /cvs-repository/Zope3/src/zope/app/services
In directory cvs.zope.org:/tmp/cvs-serv31957/src/zope/app/services

Modified Files:
      Tag: use-config-branch
	configuration.py 
Log Message:
New interface IUseConfiguration and new adapter UseConfiguration, for
a project that will become clearer later.


=== Zope3/src/zope/app/services/configuration.py 1.6 => 1.6.4.1 ===
--- Zope3/src/zope/app/services/configuration.py:1.6	Thu Jan 16 07:00:00 2003
+++ Zope3/src/zope/app/services/configuration.py	Mon Feb 24 15:32:58 2003
@@ -21,6 +21,7 @@
 from zope.app.interfaces.services.configuration import IConfigurationRegistry
 from zope.app.interfaces.services.configuration \
     import INamedComponentConfiguration, INameConfigurable
+from zope.app.interfaces.services.configuration import IUseConfiguration
 from zope.app.interfaces.services.configuration \
     import INameComponentConfigurable, INamedConfiguration, IConfiguration
 from zope.component import getService, queryService
@@ -39,6 +40,7 @@
 from zope.app.traversing import getPhysicalRoot
 from zope.app.interfaces.services.configuration \
      import Unregistered, Registered, Active
+from zope.app.interfaces.annotation import IAnnotations
 
 
 class ConfigurationStatusProperty:
@@ -272,7 +274,7 @@
             try:
                 objectpath = getPhysicalPathString(configuration)
             except: # XXX
-                objectpath = str(configuration) 
+                objectpath = str(configuration)
             raise DependencyError("Can't delete active configuration (%s)"
                                   % objectpath)
         elif objectstatus == Registered:
@@ -416,3 +418,29 @@
                 return configuration.getComponent()
         return default
     queryActiveComponent = ContextMethod(queryActiveComponent)
+
+
+USE_CONFIG_KEY = 'zope.app.services.UseConfiguration'
+
+class UseConfiguration:
+    """An adapter."""
+
+    __implements__ = IUseConfiguration
+
+    def __init__(self, context):
+        self.context = context
+
+    def addUsage(self, location):
+        annotations = getAdapter(self.context, IAnnotations)
+        annotations[USE_CONFIG_KEY] = (annotations.get(USE_CONFIG_KEY, ()) +
+                                       (location, ))
+
+    def removeUsage(self, location):
+        annotations = getAdapter(self.context, IAnnotations)
+        locs = [loc for loc in annotations.get(USE_CONFIG_KEY, ())
+                    if loc != location]
+        annotations[USE_CONFIG_KEY] = tuple(locs)
+
+    def usages(self):
+        annotations = getAdapter(self.context, IAnnotations)
+        return annotations.get(USE_CONFIG_KEY, ())