1 ### -*- coding: utf-8 -*- ####################################################

     2 ##############################################################################

     3 #

     4 # Copyright (c) 2008 Thierry Florac <tflorac AT ulthar.net>

     5 # All Rights Reserved.

     6 #

     7 # This software is subject to the provisions of the Zope Public License,

     8 # Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.

     9 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED

    10 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    11 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS

    12 # FOR A PARTICULAR PURPOSE.

    13 #

    14 ##############################################################################

    15 

    16 

    17 # import standard packages

    18 

    19 # import Zope3 interfaces

    20 from z3c.form.interfaces import IFileWidget

    21 from zope.schema.interfaces import IBytes

    22 

    23 # import local interfaces

    24 

    25 # import Zope3 packages

    26 from z3c.form.converter import FileUploadDataConverter as BaseDataConverter

    27 from zope.component import adapts

    28 

    29 # import local packages

    30 

    31 

    32 class FileUploadDataConverter(BaseDataConverter):

    33 

    34     adapts(IBytes, IFileWidget)

    35 

    36     def toWidgetValue(self, value):

    37         return value or ''