[Zope3-checkins] CVS: Zope3/src/zope/app - content.py:1.2

[Philipp von Weitershausen]

Update of /cvs-repository/Zope3/src/zope/app
In directory cvs.zope.org:/tmp/cvs-serv26823/src/zope/app

Added Files:
	content.py 
Log Message:


Since zope.app.content does not contain modules anymore, there is no
reason for it to be a package. It is a simple Python module now.




=== Zope3/src/zope/app/content.py 1.1 => 1.2 ===
--- /dev/null	Tue Feb 24 11:50:15 2004
+++ Zope3/src/zope/app/content.py	Tue Feb 24 11:50:14 2004
@@ -0,0 +1,80 @@
+##############################################################################
+#
+# Copyright (c) 2002 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""
+$Id$
+"""
+from zope.app.interfaces.content import IContentType
+from zope.interface.declarations import providedBy
+
+def queryContentType(object):
+    """returns object content type
+
+    >>> from zope.interface import Interface, implements, directlyProvides
+    >>> class I(Interface):
+    ...     pass
+    >>> directlyProvides(I, IContentType)
+    >>> class C:
+    ...     implements(I)
+    >>> obj = C()
+    >>> c1_ctype = queryContentType(obj)
+    >>> c1_ctype.__name__
+    'I'
+    >>> class I1(I):
+    ...     pass
+    >>> class I2(I1):
+    ...     pass
+    >>> class I3(Interface):
+    ...     pass
+    >>> class C1:
+    ...     implements(I1)
+    >>> obj1 = C1()
+    >>> c1_ctype = queryContentType(obj1)
+    >>> c1_ctype.__name__
+    'I'
+    >>> class C2:
+    ...     implements(I2)
+    >>> obj2 = C2()
+    >>> c2_ctype = queryContentType(obj2)
+    >>> c2_ctype.__name__
+    'I'
+    >>> class C3:
+    ...     implements(I3)
+    >>> obj3 = C3()
+
+    If Interface doesn't provide IContentType, queryContentType returns None.
+    
+    >>> c3_ctype = queryContentType(obj3)
+    >>> c3_ctype
+    >>> class I4(I):
+    ...     pass
+    >>> directlyProvides(I4, IContentType)
+    >>> class C4:
+    ...     implements(I4)
+    >>> obj4 = C4()
+    >>> c4_ctype = queryContentType(obj4)
+    >>> c4_ctype.__name__
+    'I4'
+
+    """
+    
+    object_iro = providedBy(object).__iro__
+    for iface in object_iro:
+        if IContentType.isImplementedBy(iface):
+            return iface
+        
+    return None
+    
+
+
+