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#------------------------------------------------------------------------------
# Copyright (c) 2005-2013, 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 pyface package component>
#------------------------------------------------------------------------------
""" Helper functions to automatically generate unique IDs. """
from weakref import WeakKeyDictionary
class _ObjectCounter(object):
""" Counts objects. """
def __init__(self):
self._objects_registry = WeakKeyDictionary()
def get_count(self, obj):
""" Return the number of times an object was seen.
Objects must be hashable.
"""
if obj in self._objects_registry:
count = self._objects_registry[obj]
else:
count = 0
return count
def next_count(self, obj):
""" Increase and return the number of times an object was seen.
Objects must be hashable.
"""
count = self.get_count(obj)
self._objects_registry[obj] = count + 1
return self._objects_registry[obj]
# Global object counter.
object_counter = _ObjectCounter()
def get_unique_id(object):
""" Return a unique ID of the form ClassName_X, where X is an integer.
It is only guaranteed that IDs are unique to a specific Python session, not
across sessions.
"""
class_ = object.__class__
name = class_.__name__
number = object_counter.next_count(class_)
return name + '_' + str(number)
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