appobject.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 23 Sep 2009 08:42:52 +0200
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child 3396 fb261afd49cd
permissions -rw-r--r--
[appobjects] use __regid__ instead of __id__, more explicit
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"""Base class for dynamically loaded objects accessible through the vregistry.
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You'll also find some convenience classes to build selectors.
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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import types
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from logging import getLogger
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from logilab.common.decorators import classproperty
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from logilab.common.deprecation import deprecated
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from logilab.common.logging_ext import set_log_methods
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from cubicweb import Unauthorized, NoSelectableObject
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# selector base classes and operations ########################################
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def objectify_selector(selector_func):
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    """convenience decorator for simple selectors where a class definition
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    would be overkill::
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        @objectify_selector
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        def yes(cls, *args, **kwargs):
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            return 1
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    """
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    return type(selector_func.__name__, (Selector,),
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                {'__call__': lambda self, *args, **kwargs: selector_func(*args, **kwargs)})
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def _instantiate_selector(selector):
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    """ensures `selector` is a `Selector` instance
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    NOTE: This should only be used locally in build___select__()
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    XXX: then, why not do it ??
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    """
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    if isinstance(selector, types.FunctionType):
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        return objectify_selector(selector)()
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    if isinstance(selector, type) and issubclass(selector, Selector):
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        return selector()
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    return selector
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class Selector(object):
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    """base class for selector classes providing implementation
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    for operators ``&`` and ``|``
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    This class is only here to give access to binary operators, the
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    selector logic itself should be implemented in the __call__ method
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    a selector is called to help choosing the correct object for a
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    particular context by returning a score (`int`) telling how well
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    the class given as first argument apply to the given context.
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    0 score means that the class doesn't apply.
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    """
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    @property
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    def func_name(self):
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        # backward compatibility
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        return self.__class__.__name__
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    def search_selector(self, selector):
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        """search for the given selector or selector instance in the selectors
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        tree. Return it of None if not found
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        """
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        if self is selector:
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            return self
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        if isinstance(selector, type) and isinstance(self, selector):
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            return self
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        return None
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    def __str__(self):
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        return self.__class__.__name__
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    def __and__(self, other):
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        return AndSelector(self, other)
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    def __rand__(self, other):
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        return AndSelector(other, self)
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    def __iand__(self, other):
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        raise NotImplementedError('cant use inplace & (binary and)')
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    def __or__(self, other):
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        return OrSelector(self, other)
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    def __ror__(self, other):
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        return OrSelector(other, self)
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    def __ior__(self, other):
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        raise NotImplementedError('cant use inplace | (binary or)')
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    def __invert__(self):
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        return NotSelector(self)
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    # XXX (function | function) or (function & function) not managed yet
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    def __call__(self, cls, *args, **kwargs):
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        return NotImplementedError("selector %s must implement its logic "
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                                   "in its __call__ method" % self.__class__)
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class MultiSelector(Selector):
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    """base class for compound selector classes"""
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    def __init__(self, *selectors):
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        self.selectors = self.merge_selectors(selectors)
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    def __str__(self):
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        return '%s(%s)' % (self.__class__.__name__,
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                           ','.join(str(s) for s in self.selectors))
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   116
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    @classmethod
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    def merge_selectors(cls, selectors):
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        """deal with selector instanciation when necessary and merge
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        multi-selectors if possible:
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        AndSelector(AndSelector(sel1, sel2), AndSelector(sel3, sel4))
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        ==> AndSelector(sel1, sel2, sel3, sel4)
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        """
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        merged_selectors = []
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        for selector in selectors:
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            try:
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                selector = _instantiate_selector(selector)
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            except:
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                pass
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            #assert isinstance(selector, Selector), selector
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            if isinstance(selector, cls):
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                merged_selectors += selector.selectors
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            else:
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                merged_selectors.append(selector)
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        return merged_selectors
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   137
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    def search_selector(self, selector):
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        """search for the given selector or selector instance in the selectors
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        tree. Return it of None if not found
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   141
        """
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        for childselector in self.selectors:
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            if childselector is selector:
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                return childselector
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            found = childselector.search_selector(selector)
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            if found is not None:
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   147
                return found
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        return None
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   149
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   150
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class AndSelector(MultiSelector):
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    """and-chained selectors (formerly known as chainall)"""
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    def __call__(self, cls, *args, **kwargs):
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        score = 0
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        for selector in self.selectors:
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            partscore = selector(cls, *args, **kwargs)
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            if not partscore:
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                return 0
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            score += partscore
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        return score
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class OrSelector(MultiSelector):
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    """or-chained selectors (formerly known as chainfirst)"""
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    def __call__(self, cls, *args, **kwargs):
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        for selector in self.selectors:
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            partscore = selector(cls, *args, **kwargs)
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            if partscore:
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                return partscore
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        return 0
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   171
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class NotSelector(Selector):
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    """negation selector"""
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    def __init__(self, selector):
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        self.selector = selector
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   176
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    def __call__(self, cls, *args, **kwargs):
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        score = self.selector(cls, *args, **kwargs)
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        return int(not score)
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   180
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    def __str__(self):
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        return 'NOT(%s)' % super(NotSelector, self).__str__()
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   183
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   184
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class yes(Selector):
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    """return arbitrary score
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   187
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    default score of 0.5 so any other selector take precedence
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   189
    """
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   190
    def __init__(self, score=0.5):
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   191
        self.score = score
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   192
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    def __call__(self, *args, **kwargs):
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   194
        return self.score
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   195
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   196
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   197
# the base class for all appobjects ############################################
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   198
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   199
class AppObject(object):
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    """This is the base class for CubicWeb application objects which are
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   201
    selected according to a context (usually at least a request and a result
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   202
    set).
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   203
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   204
    Concrete application objects classes are designed to be loaded by the
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    vregistry and should be accessed through it, not by direct instantiation.
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   206
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   207
    The following attributes should be set on concret appobject classes:
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   208
    :__registry__:
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      name of the registry for this object (string like 'views',
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   210
      'templates'...)
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   211
    :__regid__:
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      object's identifier in the registry (string like 'main',
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   213
      'primary', 'folder_box')
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   214
    :__select__:
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   215
      class'selector
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   216
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   217
    Moreover, the `__abstract__` attribute may be set to True to indicate
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   218
    that a appobject is abstract and should not be registered.
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   219
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    At selection time, the following attributes are set on the instance:
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   221
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   222
    :_cw:
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   223
      current request
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   224
    :cw_extra_kwargs:
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      other received arguments
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    only if rset is found in arguments (in which case rset/row/col will be
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    removed from cwextra_kwargs):
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    :cw_rset:
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      context result set or None
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    :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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    :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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    """
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    __registry__ = None
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    __regid__ = None
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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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        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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    # 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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   283
    # 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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    @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.id, 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.req.property_value(self._cwpropkey(propid))
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   302
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    # deprecated ###############################################################
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   304
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    @property
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    @deprecated('[3.6] use self._cw.vreg')
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   307
    def vreg(self):
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        return self._cw.vreg
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   309
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    @property
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    @deprecated('[3.6] use self._cw.vreg.schema')
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    def schema(self):
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        return self._cw.vreg.schema
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   314
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    @property
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   316
    @deprecated('[3.6] use self._cw.vreg.config')
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    def config(self):
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        return self._cw.vreg.config
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   319
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   320
    @property
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   321
    @deprecated('[3.6] use self._cw')
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   322
    def req(self):
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   323
        return self._cw
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   324
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   325
    @deprecated('[3.6] use self.cw_rset')
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   326
    def get_rset(self):
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        return self.cw_rset
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    @deprecated('[3.6] use self.cw_rset')
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    def set_rset(self, rset):
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        self.cw_rset = rset
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    rset = property(get_rset, set_rset)
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    @property
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   334
    @deprecated('[3.6] use self.cw_row')
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   335
    def row(self):
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        return self.cw_row
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   337
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   338
    @property
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    @deprecated('[3.6] use self.cw_col')
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   340
    def col(self):
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        return self.cw_col
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   342
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diff changeset
   343
    @property
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   344
    @deprecated('[3.6] use self.cw_extra_kwargs')
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diff changeset
   345
    def extra_kwargs(self):
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diff changeset
   346
        return self.cw_extra_kwargs
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diff changeset
   347
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diff changeset
   348
    @deprecated('[3.6] use self._cw.view')
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diff changeset
   349
    def view(self, *args, **kwargs):
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   350
        return self._cw.view(*args, **kwargs)
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diff changeset
   351
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diff changeset
   352
    @deprecated('[3.6] use self._cw.varmaker')
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diff changeset
   353
    def initialize_varmaker(self):
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diff changeset
   354
        self.varmaker = self._cw.varmaker
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parents: 2795
diff changeset
   355
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diff changeset
   356
    @deprecated('[3.6] use self._cw.get_cache')
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diff changeset
   357
    def get_cache(self, cachename):
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diff changeset
   358
        return self._cw.get_cache(cachename)
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diff changeset
   359
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diff changeset
   360
    @deprecated('[3.6] use self._cw.build_url')
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9c650701cb17 stop using controller class attribute, allowing to deprecate appobject.build_url in favor of req.build_url
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parents: 2796
diff changeset
   361
    def build_url(self, *args, **kwargs):
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parents: 2833
diff changeset
   362
        return self._cw.build_url(*args, **kwargs)
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parents: 2796
diff changeset
   363
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diff changeset
   364
    @deprecated('[3.6] use self.cw_rset.limited_rql')
2792
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parents: 2789
diff changeset
   365
    def limited_rql(self):
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parents: 2789
diff changeset
   366
        return self.rset.limited_rql()
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diff changeset
   367
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diff changeset
   368
    @deprecated('[3.6] use self.rset.complete_entity(row,col) instead')
2792
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diff changeset
   369
    def complete_entity(self, row, col=0, skip_bytes=True):
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parents: 2789
diff changeset
   370
        return self.rset.complete_entity(row, col, skip_bytes)
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diff changeset
   371
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diff changeset
   372
    @deprecated('[3.6] use self.rset.get_entity(row,col) instead')
2792
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diff changeset
   373
    def entity(self, row, col=0):
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diff changeset
   374
        return self.rset.get_entity(row, col)
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diff changeset
   375
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diff changeset
   376
    @deprecated('[3.6] use self._cw.user_rql_callback')
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diff changeset
   377
    def user_rql_callback(self, args, msg=None):
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parents: 2833
diff changeset
   378
        return self._cw.user_rql_callback(args, msg)
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diff changeset
   379
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diff changeset
   380
    @deprecated('[3.6] use self._cw.user_callback')
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diff changeset
   381
    def user_callback(self, cb, args, msg=None, nonify=False):
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diff changeset
   382
        return self._cw.user_callback(cb, args, msg, nonify)
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parents: 2789
diff changeset
   383
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diff changeset
   384
    @deprecated('[3.6] use self._cw.format_date')
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
    def format_date(self, date, date_format=None, time=False):
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parents: 2833
diff changeset
   386
        return self._cw.format_date(date, date_format, time)
0
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parents:
diff changeset
   387
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diff changeset
   388
    @deprecated('[3.6] use self._cw.format_timoe')
0
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parents:
diff changeset
   389
    def format_time(self, time):
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parents: 2833
diff changeset
   390
        return self._cw.format_time(time)
0
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parents:
diff changeset
   391
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diff changeset
   392
    @deprecated('[3.6] use self._cw.format_float')
0
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parents:
diff changeset
   393
    def format_float(self, num):
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diff changeset
   394
        return self._cw.format_float(num)
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parents: 1398
diff changeset
   395
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diff changeset
   396
    @deprecated('[3.6] use self._cw.parse_datetime')
1984
8d571df6012a move parse_datetime on appobject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   397
    def parse_datetime(self, value, etype='Datetime'):
2847
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2833
diff changeset
   398
        return self._cw.parse_datetime(value, etype)
2657
de974465d381 [appobject] kill VObject class, move base selector classes to appobject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2656
diff changeset
   399
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diff changeset
   400
    @deprecated('[3.6] use self.cw_propval')
2799
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   401
    def propval(self, propid):
2847
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2833
diff changeset
   402
        return self._cw.property_value(self._cwpropkey(propid))
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   403
2657
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2656
diff changeset
   404
set_log_methods(AppObject, getLogger('cubicweb.appobject'))