zombie.py

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# -*- Python -*-
# -*- coding: utf-8 -*-

'''rtctree

Copyright (C) 2009-2014
    Geoffrey Biggs
    RT-Synthesis Research Group
    Intelligent Systems Research Institute,
    National Institute of Advanced Industrial Science and Technology (AIST),
    Japan
    All rights reserved.
Licensed under the Eclipse Public License -v 1.0 (EPL)
http://www.opensource.org/licenses/eclipse-1.0.txt

Object representing a zombie node in the tree.

'''


from rtctree.exceptions import *
from rtctree.node import TreeNode


##############################################################################
## Zombie node object

class Zombie(TreeNode):
    '''Node representing a zombie object on a name server.

    Zombie nodes can occur below name server and directory nodes. They
    cannot contain any children. They do not contain a reference to a
    CORBA object as they represent the lack of such an object under a
    name still registered on the name server.

    '''
    def __init__(self, name, parent, *args, **kwargs):
        '''Constructor.

        @param name Name of this object (i.e. its entry in the path).
        @param parent The parent node of this node, if any.

        '''
        super(Zombie, self).__init__(name=name, parent=parent, *args, **kwargs)

    @property
    def is_zombie(self):
        '''Is this node a zombie?'''
        return True


    ###########################################################################
    # Internal API

    def _add_child(self):
        # Zombies cannot contain children.
        raise CannotHoldChildrenError


# vim: tw=79