export and import of DC annotations basically working

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@2479 fd906abe-77d9-0310-91a1-e0d9ade77398

external/README.txt

@@ -77,16 +77,29 @@ Working with nodes
 Sub-elements
 ------------
 
+Complex attributes or other informations related to an object may be
+represented by sub-elements. The standard example for this kind of data
+are the Dublin Core (DC) attributes.
+
+By importing the annotation module the corresponding element class will be
+registered.
+
   >>> from loops.external import annotation
 
   >>> input = """concept('myquery', u'My Query', 'query', viewName='mystuff.html')[
-  ...     annotations(creators='john')]"""
+  ...     annotations(creators=(u'john',))]"""
   >>> elements = reader.read(input)
   >>> elements[0].subElements
-  [{'creators': 'john'}]
+  [{'creators': (u'john',)}]
+
+Loading the element with the sub-element stores the DC attributes.
 
   >>> loader.load(elements)
-  [('creators', 'john')]
+  >>> from zope.dublincore.interfaces import IZopeDublinCore
+  >>> dc = IZopeDublinCore(concepts['myquery'])
+  >>> dc.creators
+  (u'john',)
+
 
 Exporting loops Objects
 =======================
@@ -120,20 +133,41 @@ Writing object information to the external storage
   node('home', u'Home', '', u'menu', body=u'Welcome')
   node('myquery', u'My Query', 'home', u'page', target=u'concepts/myquery')...
 
-Writing subElements
+Writing sub-elements
 -------------------
 
+Let's first set up a sequence with one element containing
+two sub-elements.
+
   >>> input = """concept('myquery', u'My Query', 'query', viewName='mystuff.html')[
   ...     annotations(creators='john'),
   ...     annotations(modified='2007-08-12')]"""
   >>> elements = reader.read(input)
   >>> output = StringIO()
   >>> writer.write(elements, output)
+
+Writing this sequence reproduces the import format.
+
   >>> print output.getvalue()
   concept('myquery', u'My Query', 'query', viewName='mystuff.html')[
       annotations(creators='john'),
       annotations(modified='2007-08-12')]...
 
+DC annotations will be exported automaticall after registering the
+corresponding extractor adapter.
+
+  >>> from loops.external.annotation import AnnotationsExtractor
+  >>> component.provideAdapter(AnnotationsExtractor)
+
+  >>> output = StringIO()
+  >>> extractor = Extractor(loopsRoot, os.path.join(dataDirectory, 'export'))
+  >>> PyWriter().write(extractor.extract(), output)
+
+  >>> print output.getvalue()
+  type(u'customer', u'Customer', options=u'', typeInterface=u'', viewName=u'')...
+  concept(u'myquery', u'My Query', u'query', options=u'', viewName='mystuff.html')[
+        annotations(creators=(u'john',))]...
+
 
 The Export/Import View
 ======================

external/annotation.py

@@ -22,6 +22,8 @@ Export/import of annotations.
 $Id$
 """
 
+from datetime import datetime
+from time import time
 from zope.component import adapts
 from zope.dublincore.interfaces import IZopeDublinCore
 from zope.interface import implements
@@ -40,7 +42,13 @@ class AnnotationsElement(Element):
             self[k] = v
 
     def __call__(self, loader):
-        print self.items()
+        obj = self.parent.object
+        dc = IZopeDublinCore(obj, None)
+        if dc is not None:
+            for k, v in self.items():
+                if k in ('created', 'modified'):
+                    v = datetime(*time.strptime(u'%Y-%m-%dT%H:%M')[0:6])
+                setattr(dc, k, v)
 
 
 class AnnotationsExtractor(object):

util.py

@@ -76,11 +76,11 @@ def nl2br(text):
     else: # gracefully handle Mac line endings
         return '<br />\n'.join(text.split('\r'))
 
-def toUnicode(text, encoding='UTF-8'):
+def toUnicode(value, encoding='UTF-8'):
-    if type(text) is not unicode:
+    if type(value) is not unicode:
-        return text.decode(encoding)
+        return value.decode(encoding)
     else:
-        return text
+        return value
 
 
 def getObjectForUid(uid, intIds=None):