schemas/workflow.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 13 Sep 2011 15:40:06 +0200
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""workflow related schemas
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from yams.buildobjs import (EntityType, RelationType, SubjectRelation,
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                            RichString, String, Int)
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from cubicweb.schema import RQLConstraint, RQLUniqueConstraint
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from cubicweb.schemas import (META_ETYPE_PERMS, META_RTYPE_PERMS,
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                              HOOKS_RTYPE_PERMS)
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class Workflow(EntityType):
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    __permissions__ = META_ETYPE_PERMS
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    name = String(required=True, indexed=True, internationalizable=True,
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                  maxsize=256)
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    description = RichString(default_format='text/rest',
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                             description=_('semantic description of this workflow'))
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    workflow_of = SubjectRelation('CWEType', cardinality='+*',
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                                  description=_('entity types which may use this workflow'),
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                                  constraints=[RQLConstraint('O final FALSE')])
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    initial_state = SubjectRelation('State', cardinality='?*',
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                                   constraints=[RQLConstraint('O state_of S',
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                                                              msg=_('state doesn\'t belong to this workflow'))],
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                                   description=_('initial state for this workflow'))
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class default_workflow(RelationType):
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    """default workflow for an entity type"""
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    __permissions__ = META_RTYPE_PERMS
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    subject = 'CWEType'
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    object = 'Workflow'
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    cardinality = '?*'
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    constraints = [RQLConstraint('S final FALSE, O workflow_of S',
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                                 msg=_('workflow isn\'t a workflow for this type'))]
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class State(EntityType):
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    """used to associate simple states to an entity type and/or to define
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    workflows
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    """
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    __permissions__ = META_ETYPE_PERMS
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    name = String(required=True, indexed=True, internationalizable=True,
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                  maxsize=256,
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                  constraints=[RQLUniqueConstraint('S name N, S state_of WF, Y state_of WF, Y name N', 'Y',
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                                                   _('workflow already have a state of that name'))])
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    description = RichString(default_format='text/rest',
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                             description=_('semantic description of this state'))
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    # XXX should be on BaseTransition w/ AND/OR selectors when we will
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    # implements #345274
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    allowed_transition = SubjectRelation('BaseTransition', cardinality='**',
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                                         constraints=[RQLConstraint('S state_of WF, O transition_of WF',
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                                                                    msg=_('state and transition don\'t belong the the same workflow'))],
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                                         description=_('allowed transitions from this state'))
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    state_of = SubjectRelation('Workflow', cardinality='1*', composite='object',
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                               description=_('workflow to which this state belongs'),
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                               constraints=[RQLUniqueConstraint('S name N, Y state_of O, Y name N', 'Y',
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                                                                _('workflow already have a state of that name'))])
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class BaseTransition(EntityType):
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    """abstract base class for transitions"""
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    __permissions__ = META_ETYPE_PERMS
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    name = String(required=True, indexed=True, internationalizable=True,
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                  maxsize=256,
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                  constraints=[RQLUniqueConstraint('S name N, S transition_of WF, Y transition_of WF, Y name N', 'Y',
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                                                   _('workflow already have a transition of that name'))])
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    type = String(vocabulary=(_('normal'), _('auto')), default='normal')
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    description = RichString(description=_('semantic description of this transition'))
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    condition = SubjectRelation('RQLExpression', cardinality='*?', composite='subject',
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                                description=_('a RQL expression which should return some results, '
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                                              'else the transition won\'t be available. '
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                                              'This query may use X and U variables '
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                                              'that will respectivly represents '
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                                              'the current entity and the current user'))
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    require_group = SubjectRelation('CWGroup', cardinality='**',
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                                    description=_('group in which a user should be to be '
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                                                  'allowed to pass this transition'))
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    transition_of = SubjectRelation('Workflow', cardinality='1*', composite='object',
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                                    description=_('workflow to which this transition belongs'),
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                                    constraints=[RQLUniqueConstraint('S name N, Y transition_of O, Y name N', 'Y',
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                                                                     _('workflow already have a transition of that name'))])
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   109
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class Transition(BaseTransition):
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    """use to define a transition from one or multiple states to a destination
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    states in workflow's definitions. Transition without destination state will
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    go back to the state from which we arrived to the current state.
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    """
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    __specializes_schema__ = True
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    destination_state = SubjectRelation(
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        'State', cardinality='?*',
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        constraints=[RQLConstraint('S transition_of WF, O state_of WF',
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                                   msg=_('state and transition don\'t belong the the same workflow'))],
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        description=_('destination state for this transition'))
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class WorkflowTransition(BaseTransition):
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    """special transition allowing to go through a sub-workflow"""
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    __specializes_schema__ = True
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    subworkflow = SubjectRelation('Workflow', cardinality='1*',
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                                  constraints=[RQLConstraint('S transition_of WF, WF workflow_of ET, O workflow_of ET',
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                                                             msg=_('subworkflow isn\'t a workflow for the same types as the transition\'s workflow'))]
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                                  )
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    # XXX use exit_of and inline it
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    subworkflow_exit = SubjectRelation('SubWorkflowExitPoint', cardinality='*1',
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                                       composite='subject')
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class SubWorkflowExitPoint(EntityType):
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    """define how we get out from a sub-workflow"""
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    subworkflow_state = SubjectRelation(
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        'State', cardinality='1*',
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        constraints=[RQLConstraint('T subworkflow_exit S, T subworkflow WF, O state_of WF',
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                                   msg=_('exit state must be a subworkflow state'))],
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        description=_('subworkflow state'))
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    destination_state = SubjectRelation(
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        'State', cardinality='?*',
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        constraints=[RQLConstraint('T subworkflow_exit S, T transition_of WF, O state_of WF',
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                                   msg=_('destination state must be in the same workflow as our parent transition'))],
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        description=_('destination state. No destination state means that transition '
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                      'should go back to the state from which we\'ve entered the '
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                      'subworkflow.'))
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class TrInfo(EntityType):
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    """workflow history item"""
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    # 'add' security actually done by hooks
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',), # XXX U has_read_permission O ?
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        'add':    ('managers', 'users', 'guests',),
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        'delete': (), # XXX should we allow managers to delete TrInfo?
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        'update': ('managers', 'owners',),
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    }
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    # The unique_together constraint ensures that 2 repositories
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    # sharing the db won't be able to fire a transition simultaneously
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    # on the same entity tr_count is filled in the FireTransitionHook
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    # to the number of TrInfo attached to the entity on which we
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    # attempt to fire a transition. In other word, it contains the
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    # rank of the TrInfo for that entity, and the constraint says we
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    # cannot have 2 TrInfo with the same rank.
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    __unique_together__ = [('tr_count', 'wf_info_for')]
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    from_state = SubjectRelation('State', cardinality='1*', inlined=True)
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    to_state = SubjectRelation('State', cardinality='1*', inlined=True)
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    # make by_transition optional because we want to allow managers to set
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    # entity into an arbitrary state without having to respect wf transition
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    by_transition = SubjectRelation('BaseTransition', cardinality='?*')
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    comment = RichString(fulltextindexed=True)
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    tr_count = Int(description='autocomputed attribute used to ensure transition coherency')
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    # get actor and date time using owned_by and creation_date
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class from_state(RelationType):
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    __permissions__ = HOOKS_RTYPE_PERMS.copy()
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    inlined = True
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class to_state(RelationType):
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    __permissions__ = HOOKS_RTYPE_PERMS.copy()
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    inlined = True
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class by_transition(RelationType):
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    # 'add' security actually done by hooks
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        'add':    ('managers', 'users', 'guests',),
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        'delete': (),
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    }
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    inlined = True
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class workflow_of(RelationType):
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    """link a workflow to one or more entity type"""
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    __permissions__ = META_RTYPE_PERMS
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class state_of(RelationType):
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    """link a state to one or more workflow"""
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    __permissions__ = META_RTYPE_PERMS
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    inlined = True
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class transition_of(RelationType):
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    """link a transition to one or more workflow"""
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    __permissions__ = META_RTYPE_PERMS
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    inlined = True
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class destination_state(RelationType):
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    """destination state of a transition"""
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    __permissions__ = META_RTYPE_PERMS
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    inlined = True
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class allowed_transition(RelationType):
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    """allowed transitions from this state"""
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    __permissions__ = META_RTYPE_PERMS
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class initial_state(RelationType):
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    """indicate which state should be used by default when an entity using
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    states is created
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    """
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    __permissions__ = META_RTYPE_PERMS
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    inlined = True
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class subworkflow(RelationType):
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    __permissions__ = META_RTYPE_PERMS
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    inlined = True
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class exit_point(RelationType):
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    __permissions__ = META_RTYPE_PERMS
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class subworkflow_state(RelationType):
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    __permissions__ = META_RTYPE_PERMS
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    inlined = True
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class condition(RelationType):
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    __permissions__ = META_RTYPE_PERMS
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# already defined in base.py
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# class require_group(RelationType):
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#     __permissions__ = META_RTYPE_PERMS
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# "abstract" relations, set by WorkflowableEntityType ##########################
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class custom_workflow(RelationType):
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    """allow to set a specific workflow for an entity"""
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    __permissions__ = META_RTYPE_PERMS
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    cardinality = '?*'
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    constraints = [RQLConstraint('S is ET, O workflow_of ET',
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                                 msg=_('workflow isn\'t a workflow for this type'))]
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    object = 'Workflow'
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class wf_info_for(RelationType):
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    """link a transition information to its object"""
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    # 'add' security actually done by hooks
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        'add':    ('managers', 'users', 'guests',),
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        'delete': (),
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    }
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    inlined = True
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    cardinality = '1*'
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    composite = 'object'
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    fulltext_container = composite
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    subject = 'TrInfo'
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class in_state(RelationType):
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    """indicate the current state of an entity"""
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    __permissions__ = HOOKS_RTYPE_PERMS
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    # not inlined intentionnaly since when using ldap sources, user'state
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    # has to be stored outside the CWUser table
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    inlined = False
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    cardinality = '1*'
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    constraints = [RQLConstraint('S is ET, O state_of WF, WF workflow_of ET',
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                                 msg=_('state doesn\'t apply to this entity\'s type'))]
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    object = 'State'