cd46c0a345
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2556 fd906abe-77d9-0310-91a1-e0d9ade77398
121 lines
4.1 KiB
Python
121 lines
4.1 KiB
Python
#
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# Copyright (c) 2008 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Interfaces for the `stateful` package.
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$Id$
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"""
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from zope.component.interfaces import IObjectEvent
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from zope.interface import Interface, Attribute
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class IState(Interface):
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name = Attribute('The name or identifier of the state')
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title = Attribute('A user-readable name or title of the state')
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transitions = Attribute('A sequence of strings naming the transitions '
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'that can be executed from this state')
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class ITransition(Interface):
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name = Attribute('The name or identifier of the transition')
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title = Attribute('A user-readable name or title of the transition')
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targetState = Attribute('A string naming the state that will be the '
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'result of executing this transition')
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class IStateful(Interface):
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""" Provides basic methods for stateful objects.
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"""
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def getState():
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""" Return the name of the state of the object.
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"""
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def getStateObject():
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""" Return the state (an IState implementation) of the context object.
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"""
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def doTransition(transition, historyInfo=None):
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""" Execute a transition; the transition is specified by its name.
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The ``transition`` argument may be an iterable; in this case
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its elements will be checked against the available transitions
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and the first one that's available will be executed.
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The ``historyInfo`` argument is an arbitrary object that will be
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used for recording the transition execution in the history
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(only if the context object is adaptable to IHistorizable).
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"""
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def getAvailableTransitions():
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""" Return the transitions for this object that are available in
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the current state. The returned transition objects should
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provide the ITransition interface.
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"""
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def getAvailableTransitionsForUser():
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""" Return the transitions for this object that are available for
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the current user. This is a subset of all available transitions
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for the current state.
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"""
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class IHistorizable(Interface):
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""" An object that may record history information, e.g. when
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performing a state transition.
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"""
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def record(info):
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""" Record the information given (typically a mapping) with the
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object.
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"""
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def recordTransition(stateFrom, stateTo, transition, historyInfo=None):
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""" Record the state transition characterized by the arguments
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(names of the states and the transition), optionally
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supplemented by the additional history information given.
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"""
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class IStatesDefinition(Interface):
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""" A simple definition for a set of states and transitions between them,
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Similar to an entity-based workflow definition.
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"""
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name = Attribute('The name or identifier of the states definition')
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def doTransitionFor(object, transition):
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""" Execute a transition for the object given;
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the transition is specified by its name.
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"""
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def getAvailableTransitionsFor(object):
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""" Return the transitions available for this object in its current state.
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"""
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class ITransitionEvent(IObjectEvent):
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""" Fires when the state of an object is changed.
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"""
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transition = Attribute('The transition.')
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previousState = Attribute('The name of the state before the transition.')
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