[Checkins] SVN: z3c.filetype/trunk/src/z3c/filetype/ added applyInterfaces method

[Bernd Dorn]

Log message for revision 69404:
  added applyInterfaces method

Changed:
  U   z3c.filetype/trunk/src/z3c/filetype/README.txt
  U   z3c.filetype/trunk/src/z3c/filetype/TODO.txt
  U   z3c.filetype/trunk/src/z3c/filetype/api.py
  A   z3c.filetype/trunk/src/z3c/filetype/event.py
  U   z3c.filetype/trunk/src/z3c/filetype/interfaces/__init__.py

-=-
Modified: z3c.filetype/trunk/src/z3c/filetype/README.txt
===================================================================
--- z3c.filetype/trunk/src/z3c/filetype/README.txt	2006-08-11 14:03:36 UTC (rev 69403)
+++ z3c.filetype/trunk/src/z3c/filetype/README.txt	2006-08-11 14:54:22 UTC (rev 69404)
@@ -77,3 +77,39 @@
   '/.../z3c/filetype/testdata/test.tar'
   >>> sorted(api.getInterfacesFor(f.name))
   [<InterfaceClass z3c.filetype.interfaces.filetypes.ITARFile>]
+
+
+There is also a convinience function which applies filetype interfaces
+to an object. This object needs to implement ITypeableFile. This also
+fires events, so let us setup the event handling.
+
+  >>> from zope.component import eventtesting
+  >>> eventtesting.setUp()
+
+  >>> from z3c.filetype import interfaces
+  >>> from zope import interface
+  >>> class Foo(object):
+  ...     interface.implements(interfaces.ITypeableFile)
+  ...     def __init__(self, f):
+  ...         self.data = f
+  >>> foo = Foo(f)
+
+The applInterfaces method returns a boolean if changes occured.
+
+  >>> api.applyInterfaces(foo)
+  True
+
+And an event should be have been fired.
+
+  >>> eventtesting.getEvents()
+  [<z3c.filetype.event.FileTypeModifiedEvent object at ...>]
+
+  >>> api.applyInterfaces(foo)
+  False
+
+Now the object should implement the right interface according to the
+ata contained.
+
+  >>> interfaces.filetypes.ITARFile.providedBy(foo)
+  True
+

Modified: z3c.filetype/trunk/src/z3c/filetype/TODO.txt
===================================================================
--- z3c.filetype/trunk/src/z3c/filetype/TODO.txt	2006-08-11 14:03:36 UTC (rev 69403)
+++ z3c.filetype/trunk/src/z3c/filetype/TODO.txt	2006-08-11 14:54:22 UTC (rev 69404)
@@ -6,4 +6,4 @@
 
 Adapters from IFileType to IImage, IFile
 
-
+Freeze api and write interface

Modified: z3c.filetype/trunk/src/z3c/filetype/api.py
===================================================================
--- z3c.filetype/trunk/src/z3c/filetype/api.py	2006-08-11 14:03:36 UTC (rev 69403)
+++ z3c.filetype/trunk/src/z3c/filetype/api.py	2006-08-11 14:54:22 UTC (rev 69404)
@@ -1,7 +1,10 @@
 from z3c.filetype import magic
+import interfaces
 from interfaces import filetypes
 from zope.contenttype import guess_content_type
 from zope import interface
+from zope.event import notify
+from event import FileTypeModifiedEvent
 
 magicFile = magic.MagicFile()
 
@@ -41,6 +44,18 @@
             ifaces.update(byMimeType(t))
     return ifaces
 
+def applyInterfaces(obj):
+    assert(interfaces.ITypeableFile.providedBy(obj))
+    ifaces = InterfaceSet(*getInterfacesFor(obj.data))
+    provided = set(interface.directlyProvidedBy(obj))
+    for iface in provided:
+        ifaces.add(iface)
+    if set(ifaces)!=provided:
+        for iface in ifaces:
+            interface.directlyProvides(obj,iface)
+        notify(FileTypeModifiedEvent(obj))
+        return True
+    return False
 
 class InterfaceSet(object):
 

Added: z3c.filetype/trunk/src/z3c/filetype/event.py
===================================================================
--- z3c.filetype/trunk/src/z3c/filetype/event.py	2006-08-11 14:03:36 UTC (rev 69403)
+++ z3c.filetype/trunk/src/z3c/filetype/event.py	2006-08-11 14:54:22 UTC (rev 69404)
@@ -0,0 +1,8 @@
+from zope.lifecycleevent import ObjectModifiedEvent
+from zope import interface
+import interfaces
+
+class FileTypeModifiedEvent(ObjectModifiedEvent):
+    interface.implements(interfaces.IFileTypeModifiedEvent)
+
+


Property changes on: z3c.filetype/trunk/src/z3c/filetype/event.py
___________________________________________________________________
Name: svn:keywords
   + Id
Name: svn:eol-style
   + native

Modified: z3c.filetype/trunk/src/z3c/filetype/interfaces/__init__.py
===================================================================
--- z3c.filetype/trunk/src/z3c/filetype/interfaces/__init__.py	2006-08-11 14:03:36 UTC (rev 69403)
+++ z3c.filetype/trunk/src/z3c/filetype/interfaces/__init__.py	2006-08-11 14:54:22 UTC (rev 69404)
@@ -1 +1,15 @@
-# interaces package
+from zope.lifecycleevent.interfaces import IObjectModifiedEvent
+from zope import interface
+
+class IFileTypeModifiedEvent(IObjectModifiedEvent):
+
+    """This event is fired when the filetypes change on an object"""
+
+
+class ITypeableFile(interface.Interface):
+
+    """A file object that is typeable"""
+
+    data = interface.Attribute('Data of the file')
+    
+