[Zope3-checkins] SVN: Zope3/trunk/src/zope/app/annotation/ Added __nonzero__ method to annotations, so we can quickly test

[Jim Fulton]

Log message for revision 26632:
  Added __nonzero__ method to annotations, so we can quickly test
  whether we have annotations.
  


Changed:
  U   Zope3/trunk/src/zope/app/annotation/attribute.py
  U   Zope3/trunk/src/zope/app/annotation/interfaces.py
  U   Zope3/trunk/src/zope/app/annotation/tests/annotations.py


-=-
Modified: Zope3/trunk/src/zope/app/annotation/attribute.py
===================================================================
--- Zope3/trunk/src/zope/app/annotation/attribute.py	2004-07-19 14:28:22 UTC (rev 26631)
+++ Zope3/trunk/src/zope/app/annotation/attribute.py	2004-07-19 14:56:53 UTC (rev 26632)
@@ -36,6 +36,9 @@
     def __init__(self, obj):
         self.obj = obj        
 
+    def __nonzero__(self):
+        return bool(getattr(self.obj, '__annotations__', 0))
+
     def get(self, key, default=None):
         """See zope.app.annotation.interfaces.IAnnotations"""
         annotations = getattr(self.obj, '__annotations__', None)

Modified: Zope3/trunk/src/zope/app/annotation/interfaces.py
===================================================================
--- Zope3/trunk/src/zope/app/annotation/interfaces.py	2004-07-19 14:28:22 UTC (rev 26631)
+++ Zope3/trunk/src/zope/app/annotation/interfaces.py	2004-07-19 14:56:53 UTC (rev 26632)
@@ -47,6 +47,10 @@
 
     """
 
+    def __nonzero__():
+        """Test whether there are any annotations
+        """
+
     def __getitem__(key):
         """Return the annotation stored under key.
 

Modified: Zope3/trunk/src/zope/app/annotation/tests/annotations.py
===================================================================
--- Zope3/trunk/src/zope/app/annotation/tests/annotations.py	2004-07-19 14:28:22 UTC (rev 26631)
+++ Zope3/trunk/src/zope/app/annotation/tests/annotations.py	2004-07-19 14:56:53 UTC (rev 26632)
@@ -32,6 +32,13 @@
     def setUp(self):
         self.obj = {1:2, 3:4}
 
+    def test_nonzero(self):
+        self.failIf(self.annotations)
+        self.annotations['unittest'] = self.obj
+        self.failUnless(self.annotations)
+        del self.annotations['unittest']
+        self.failIf(self.annotations)        
+
     def testInterfaceVerifies(self):
         verifyObject(IAnnotations, self.annotations)