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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: Enthought, Inc.
# Description: <Enthought naming package component>
#------------------------------------------------------------------------------
""" The node manager for a naming tree. """
# Enthought library imports.
from enthought.pyface.tree.api import NodeManager
class NamingNodeManager(NodeManager):
""" The node manager for a naming tree. """
###########################################################################
# 'NodeManager' interface.
###########################################################################
def get_key(self, node):
""" Generates a unique key for a node. """
# fixme: This scheme does NOT allow the same object to be in the tree
# in more than one place.
return self._get_hash_value(node.obj)
###########################################################################
# Private interface.
###########################################################################
def _get_hash_value(self, obj):
""" Returns a hash value for an object. """
# We do it like this 'cos, for example, using id() on a string
# doesn't give us what we want, but things like lists aren't
# hashable, so we can't always use hash()).
try:
hash_value = hash(obj)
except:
hash_value = id(obj)
return hash_value
##### EOF #####################################################################
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