appobject.py
author Rémi Cardona <remi.cardona@logilab.fr>
Thu, 09 Jul 2015 12:40:43 +0200
changeset 10520 d477e6447582
parent 8930 6a02be304486
child 10496 e95b559a06a2
permissions -rw-r--r--
[pkg] 3.20.9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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"""
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.. _appobject:
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The `AppObject` class
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---------------------
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The AppObject class is the base class for all dynamically loaded objects
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(application objects) accessible through the vregistry.
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We can find a certain number of attributes and methods defined in this class and
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common to all the application objects.
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.. autoclass:: AppObject
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"""
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__docformat__ = "restructuredtext en"
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from logging import getLogger
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from logilab.common.deprecation import deprecated, class_renamed
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from logilab.common.logging_ext import set_log_methods
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# first line imports for bw compat
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from logilab.common.registry import (objectify_predicate, traced_selection, Predicate,
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                                     RegistrableObject, yes)
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objectify_selector = deprecated('[3.15] objectify_selector has been '
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                                'renamed to objectify_predicates in '
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                                'logilab.common.registry')(objectify_predicate)
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traced_selection = deprecated('[3.15] traced_selection has been '
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                              'moved to logilab.common.registry')(traced_selection)
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Selector = class_renamed('Selector', Predicate,
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                         '[3.15] Selector has been renamed to Predicate '
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                         'in logilab.common.registry')
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@deprecated('[3.15] lltrace decorator can now be removed')
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def lltrace(func):
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    return func
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# the base class for all appobjects ############################################
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class AppObject(RegistrableObject):
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    """This is the base class for CubicWeb application objects which are
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    selected in a request context.
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    The following attributes should be set on concrete appobject classes:
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    At selection time, the following attributes are set on the instance:
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    :attr:`_cw`
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      current request
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    :attr:`cw_extra_kwargs`
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      other received arguments
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    And also the following, only if `rset` is found in arguments (in which case
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    rset/row/col will be removed from `cwextra_kwargs`):
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    :attr:`cw_rset`
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      context result set or None
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    :attr:`cw_row`
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      if a result set is set and the context is about a particular cell in the
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      result set, and not the result set as a whole, specify the row number we
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      are interested in, else None
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    :attr:`cw_col`
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      if a result set is set and the context is about a particular cell in the
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      result set, and not the result set as a whole, specify the col number we
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      are interested in, else None
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    .. Note::
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      * do not inherit directly from this class but from a more specific class
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        such as `AnyEntity`, `EntityView`, `AnyRsetView`, `Action`...
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    """
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    __select__ = yes()
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    @classmethod
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    def __registered__(cls, registry):
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        """called by the registry when the appobject has been registered.
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        It must return the object that will be actually registered (this may be
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        the right hook to create an instance for example). By default the
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        appobject is returned without any transformation.
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        """
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        pdefs = getattr(cls, 'cw_property_defs', {})
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        for propid, pdef in pdefs.items():
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            pdef = pdef.copy() # may be shared
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            pdef['default'] = getattr(cls, propid, pdef['default'])
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            pdef['sitewide'] = getattr(cls, 'site_wide', pdef.get('sitewide'))
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            registry.vreg.register_property(cls._cwpropkey(propid), **pdef)
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        assert callable(cls.__select__), cls
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        return cls
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    def __init__(self, req, **extra):
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        super(AppObject, self).__init__()
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        self._cw = req
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        try:
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            self.cw_rset = extra.pop('rset')
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            self.cw_row = extra.pop('row', None)
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            self.cw_col = extra.pop('col', None)
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        except KeyError:
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            pass
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        self.cw_extra_kwargs = extra
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   124
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    # persistent class properties ##############################################
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    #
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    # optional `cw_property_defs` dict on a class defines available persistent
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    # properties for this class:
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    #
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    # * key: id of the property (the actual CWProperty key is build using
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    #        <registry name>.<obj id>.<property id>
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    # * value: tuple (property type, vocabfunc, default value, property description)
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    #         possible types are those used by `logilab.common.configuration`
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    #
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    # notice that when it exists multiple objects with the same id (adaptation,
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    # overriding) only the first encountered definition is considered, so those
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    # objects can't try to have different default values for instance.
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    #
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    # you can then access to a property value using self.cw_propval, where self
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    # is an instance of class
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0
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    @classmethod
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    def _cwpropkey(cls, propid):
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        """return cw property key for the property of the given id for this
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        class
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        """
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        return '%s.%s.%s' % (cls.__registry__, cls.__regid__, propid)
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    def cw_propval(self, propid):
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        """return cw property value associated to key
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        <cls.__registry__>.<cls.id>.<propid>
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        """
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        return self._cw.property_value(self._cwpropkey(propid))
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   155
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    # these are overridden by set_log_methods below
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    # only defining here to prevent pylint from complaining
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    info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None
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set_log_methods(AppObject, getLogger('cubicweb.appobject'))
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# defined here to avoid warning on usage on the AppObject class
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yes = deprecated('[3.15] yes has been moved to logilab.common.registry')(yes)