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trait_errors.py

#-------------------------------------------------------------------------------
#
#  Define the standard exceptions issued by traits.
#
#  Written by: David C. Morrill
#
#  Date: 06/21/2002
#
#  Refactored into a separate module: 07/04/2003
#
#  (c) Copyright 2002, 2003 by Enthought, Inc.
#
#-------------------------------------------------------------------------------

#-------------------------------------------------------------------------------
#  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:
          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 )
       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 ) )
   
#-------------------------------------------------------------------------------
#  '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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