--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_utils/views/decimal.py	Thu Feb 19 00:46:48 2015 +0100
@@ -0,0 +1,52 @@
+#
+# Copyright (c) 2008-2015 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (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.
+#
+
+__docformat__ = 'restructuredtext'
+
+
+# import standard library
+import decimal
+
+# import interfaces
+from z3c.form.interfaces import IWidget, IDataConverter
+
+# import packages
+from pyams_utils.adapter import adapter_config
+from pyams_utils.schema import IDottedDecimalField
+from z3c.form.converter import BaseDataConverter, FormatterValidationError
+
+from pyams_utils import _
+
+
+@adapter_config(context=(IDottedDecimalField, IWidget), provides=IDataConverter)
+class DottedDecimalDataConverter(BaseDataConverter):
+    """Dotted decimal field data converter"""
+
+    errorMessage = _('The entered value is not a valid decimal literal.')
+
+    def __init__(self, field, widget):
+        super(DottedDecimalDataConverter, self).__init__(field, widget)
+
+    def toWidgetValue(self, value):
+        if not value:
+            return self.field.missing_value
+        return value
+
+    def toFieldValue(self, value):
+        if value is self.field.missing_value:
+            return ''
+        if not value:
+            return None
+        try:
+            return decimal.Decimal(value)
+        except decimal.InvalidOperation:
+            raise FormatterValidationError(self.errorMessage, value)