selectors.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 10 May 2012 10:37:28 +0200
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parent 8220 e4ea285510e5
parent 8395 41729460d8c3
child 8596 bd4f5052a532
permissions -rw-r--r--
backport stable
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# copyright 2003-2012 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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from warnings import warn
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from logilab.common.deprecation import deprecated, class_renamed
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from cubicweb.predicates import *
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warn('[3.15] cubicweb.selectors renamed into cubicweb.predicates',
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     DeprecationWarning, stacklevel=2)
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# XXX pre 3.15 bw compat
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from cubicweb.appobject import (objectify_selector, traced_selection,
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                                lltrace, yes)
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ExpectedValueSelector = class_renamed('ExpectedValueSelector',
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                                      ExpectedValuePredicate)
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EClassSelector = class_renamed('EClassSelector', EClassPredicate)
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EntitySelector = class_renamed('EntitySelector', EntityPredicate)
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# XXX pre 3.7? bw compat
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class on_transition(is_in_state):
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    """Return 1 if entity is in one of the transitions given as argument list
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    Especially useful to match passed transition to enable notifications when
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    your workflow allows several transition to the same states.
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    Note that if workflow `change_state` adapter method is used, this predicate
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    will not be triggered.
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    You should use this instead of your own :class:`score_entity` predicate to
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    avoid some gotchas:
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    * possible views gives a fake entity with no state
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    * you must use the latest tr info thru the workflow adapter for repository
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      side checking of the current state
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    In debug mode, this predicate can raise:
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    :raises: :exc:`ValueError` for unknown transition names
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        (etype workflow only not checked in custom workflow)
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    :rtype: int
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    """
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    @deprecated('[3.12] on_transition is deprecated, you should rather use '
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                'on_fire_transition(etype, trname)')
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    def __init__(self, *expected):
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        super(on_transition, self).__init__(*expected)
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    def _score(self, adapted):
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        trinfo = adapted.latest_trinfo()
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        if trinfo and trinfo.by_transition:
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            return trinfo.by_transition[0].name in self.expected
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    def _validate(self, adapted):
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        wf = adapted.current_workflow
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        valid = [n.name for n in wf.reverse_transition_of]
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        unknown = sorted(self.expected.difference(valid))
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        if unknown:
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            raise ValueError("%s: unknown transition(s): %s"
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                             % (wf.name, ",".join(unknown)))
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entity_implements = class_renamed('entity_implements', is_instance)
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class _but_etype(EntityPredicate):
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    """accept if the given entity types are not found in the result set.
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    See `EntityPredicate` documentation for behaviour when row is not specified.
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    :param *etypes: entity types (`basestring`) which should be refused
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    """
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    def __init__(self, *etypes):
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        super(_but_etype, self).__init__()
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        self.but_etypes = etypes
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    def score(self, req, rset, row, col):
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        if rset.description[row][col] in self.but_etypes:
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            return 0
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        return 1
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but_etype = class_renamed('but_etype', _but_etype, 'use ~is_instance(*etypes) instead')
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# XXX deprecated the one_* variants of predicates below w/ multi_xxx(nb=1)?
4320
4efd4c306746 closes #345410: two_lines_rset, two_cols_rset, two_etypes_rset are badly named
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4264
diff changeset
   103
#     take care at the implementation though (looking for the 'row' argument's
4efd4c306746 closes #345410: two_lines_rset, two_cols_rset, two_etypes_rset are badly named
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4264
diff changeset
   104
#     value)
4efd4c306746 closes #345410: two_lines_rset, two_cols_rset, two_etypes_rset are badly named
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4264
diff changeset
   105
two_lines_rset = class_renamed('two_lines_rset', multi_lines_rset)
4efd4c306746 closes #345410: two_lines_rset, two_cols_rset, two_etypes_rset are badly named
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4264
diff changeset
   106
two_cols_rset = class_renamed('two_cols_rset', multi_columns_rset)
4efd4c306746 closes #345410: two_lines_rset, two_cols_rset, two_etypes_rset are badly named
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4264
diff changeset
   107
two_etypes_rset = class_renamed('two_etypes_rset', multi_etypes_rset)