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#-------------------------------------------------------------------------------
#
# Defines an adapter from an codetools.contexts.api.IContext
# to an ITemplateDataContext.
#
# Written by: David C. Morrill
# Modified by: Robert Kern
#
# Date: 11/16/2007
#
# (c) Copyright 2007 by Enthought, Inc.
#
#-------------------------------------------------------------------------------
""" Defines an adapter from an codetools.contexts.api.IContext to an
ITemplateDataContext.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from traits.api \
import Adapter, Str, List, adapts
from traits.protocols.api \
import AdaptationError, adapt
from codetools.contexts.api \
import IContext
from apptools.template.itemplate_data_context \
import ITemplateDataContext, ITemplateDataContextError
from helper \
import path_for
#-------------------------------------------------------------------------------
# 'IContextAdapter' class:
#-------------------------------------------------------------------------------
class IContextAdapter ( Adapter ):
""" Defines an adapter from an codetools.contexts.api.IContext
to an ITemplateDataContext.
"""
adapts( IContext, ITemplateDataContext )
#-- ITemplateDataContext Interface Implementation --------------------------
# The path to this data context (does not include the 'data_context_name'):
data_context_path = Str
# The name of the data context:
data_context_name = Str
# A list of the names of the data values in this context:
data_context_values = List( Str )
# The list of the names of the sub-contexts of this context:
data_contexts = List( Str )
def get_data_context_value ( self, name ):
""" Returns the data value with the specified *name*. Raises a
**ITemplateDataContextError** if *name* is not defined as a data
value in the context.
Parameters
----------
name : A string specifying the name of the context data value to
be returned.
Returns
-------
The data value associated with *name* in the context. The type of
the data is application dependent.
Raises **ITemplateDataContextError** if *name* is not associated
with a data value in the context.
"""
try:
if name in self.data_context_values:
return self.adaptee[ name ]
raise ITemplateDataContextError(
"No value named '%s' found." % name )
except Exception, excp:
raise ITemplateDataContextError( str( excp ) )
def get_data_context ( self, name ):
""" Returns the **ITemplateDataContext** value associated with the
specified *name*. Raises **ITemplateDataContextError** if *name* is
not defined as a data context in the context.
Parameters
----------
name : A string specifying the name of the data context to be
returned.
Returns
-------
The **ITemplateDataContext** associated with *name* in the context.
Raises **ITemplateDataContextError** if *name* is not associated
with a data context in the context.
"""
try:
if name in self.data_contexts:
bdca = IContextAdapter( self.adaptee[ name ] )
bdca.data_context_path = path_for( self.data_context_path,
self.data_context_name )
return bdca
raise ITemplateDataContextError(
"No context named '%s' found." % name )
except Exception, excp:
raise ITemplateDataContextError( str( excp ) )
#-- Traits Event Handlers --------------------------------------------------
def _adaptee_changed ( self, context ):
""" Handles being bound to a IContext object.
"""
self.data_context_name = context.name
values = []
contexts = []
for name in context.keys():
value = context[ name ]
try:
adapt( value, IContext )
except AdaptationError:
# Is not a subcontext.
values.append( name )
else:
# Is a subcontext.
contexts.append( name )
self.data_context_values = values
self.data_contexts = contexts
|
