external files: use real file modification date for 'modified' information

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@3966 fd906abe-77d9-0310-91a1-e0d9ade77398

interfaces.py

@@ -786,9 +786,12 @@ class IExternalFile(IFile):
                missing_value='',
                required=False)
 
-    def copyDataFile(self, targetAddress):
-        """ Copy the external file object with all data to the target address
-            given.
+    def copyDataFile(self, targetParams, targetAddress=None):
+        """ Copy the external file object with all data to the destination
+            specified by target params and target address.
+
+            If no target address is given the external address of the
+            object is used.
         """
 
 

resource.py

@@ -402,6 +402,10 @@ class ExternalFileAdapter(FileAdapter):
     def storage(self):
         return component.getUtility(IExternalStorage, name=self.storageName)
 
+    @Lazy
+    def modified(self):
+        return self.storage.getMTime(self.externalAddress, self.storageParams)
+
     def copyDataFile(self, targetParams, targetAddress=None):
         storageParams = self.storageParams
         externalAddress = self.externalAddress