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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#
# Author: David C. Morrill
# Date: 06/21/2002
# ------------------------------------------------------------------------------
""" Defines the standard exceptions raised by the Traits package.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import exceptions
from trait_base \
import class_of
#-------------------------------------------------------------------------------
# 'TraitError' class:
#-------------------------------------------------------------------------------
class TraitError ( exceptions.Exception ):
def __init__ ( self, args = None, name = None, info = None, value = None ):
if name is None:
# If the given args is not a tuple then assume that the user intended
# it to be the single item in a one-element tuple.
if not isinstance(args, tuple):
args = args,
self.args = args
else:
# Save the information, in case the 'args' object is not the correct
# one, and we need to regenerate the message later:
self.name = name
self.info = info
self.value = value
self.desc = None
self.prefix = 'The'
self.set_desc( None, args )
def set_desc ( self, desc, object = None ):
if hasattr( self, 'desc' ):
if desc is not None:
self.desc = desc
if object is not None:
self.object = object
self.set_args()
def set_prefix ( self, prefix ):
if hasattr( self, 'prefix' ):
self.prefix = prefix
self.set_args()
def set_args ( self ):
if self.desc is None:
extra = ''
else:
extra = ' specifies %s and' % self.desc
obj = getattr( self, 'object', None )
# Note: self.args must be a tuple so be sure to leave the trailing
# commas.
if obj is not None:
self.args = ( "%s '%s' trait of %s instance%s must be %s, "
"but a value of %s was specified." % (
self.prefix, self.name, class_of( obj ), extra,
self.info, self.value ) ),
else:
self.args = ( "%s '%s' trait%s must be %s, but a value of %s was "
"specified." % ( self.prefix, self.name, extra,
self.info, self.value ) ),
#-------------------------------------------------------------------------------
# 'TraitNotificationError' class:
#-------------------------------------------------------------------------------
class TraitNotificationError ( exceptions.Exception ):
pass
#-------------------------------------------------------------------------------
# 'DelegationError' class:
#-------------------------------------------------------------------------------
class DelegationError ( TraitError ):
def __init__ ( self, args ):
self.args = args
#-------------------------------------------------------------------------------
# Export the defined exceptions to the C-base traits module:
#-------------------------------------------------------------------------------
import ctraits
ctraits._exceptions( TraitError, DelegationError )
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