[Zope-Checkins] CVS: Zope3/lib/python/Zope/ComponentArchitecture - ServiceManagerContainer.py:1.1.2.1

[Paul Everitt]

Update of /cvs-repository/Zope3/lib/python/Zope/ComponentArchitecture
In directory cvs.zope.org:/tmp/cvs-serv11288

Added Files:
      Tag: Zope-3x-branch
	ServiceManagerContainer.py 
Log Message:
Refactored to use a base class for ServiceManagerContainer

=== Added File Zope3/lib/python/Zope/ComponentArchitecture/ServiceManagerContainer.py ===
##############################################################################
#
# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
# All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
# 
##############################################################################
"""

Revision information:
$Id: ServiceManagerContainer.py,v 1.1.2.1 2002/02/28 20:23:50 paul Exp $
"""

from IServiceManagerContainer import IServiceManagerContainer
from IServiceService import IServiceService
from Zope.ComponentArchitecture.Exceptions import ComponentLookupError

_marker = object()

class ServiceManagerContainer:

    __implements__ =  IServiceManagerContainer

    ############################################################
    # Implementation methods for interface
    # Zope.ComponentArchitecture.IServiceManagerContainer.

    def hasServiceManager(self):
        '''See interface IServiceManagerContainer'''

        return hasattr(self, '_ServiceManagerContainer__sm')

    def getServiceManager(self, default=_marker):
        '''See interface IServiceManagerContainer'''

        try:
            return self.__sm
        except AttributeError:
            if default is _marker:
                raise ComponentLookupError
            else:
                return default

    def setServiceManager(self, sm):
        '''See interface IServiceManagerContainer'''

        if IServiceService.isImplementedBy(sm):
            self.__sm = sm
        else:
            raise ValueError('setServiceManager requires an IServiceService')

    #
    ############################################################