appobject.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 13 Aug 2009 09:59:35 +0200
changeset 2798 9c650701cb17
parent 2796 14d2c69e12c4
child 2799 b703639614e7
permissions -rw-r--r--
stop using controller class attribute, allowing to deprecate appobject.build_url in favor of req.build_url
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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 __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 __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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    @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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   130
            else:
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                merged_selectors.append(selector)
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        return merged_selectors
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   133
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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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        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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   143
                return found
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        return None
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   145
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   146
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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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   166
        return 0
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   167
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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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   172
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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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   176
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    def __str__(self):
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        return 'NOT(%s)' % super(NotSelector, self).__str__()
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   179
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   180
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class yes(Selector):
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    """return arbitrary score
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   183
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    default score of 0.5 so any other selector take precedence
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    """
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    def __init__(self, score=0.5):
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        self.score = score
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   188
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    def __call__(self, *args, **kwargs):
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   190
        return self.score
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   191
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   192
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   193
# the base class for all appobjects ############################################
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   194
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class AppObject(object):
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    """This is the base class for CubicWeb application objects which are
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    selected according to a context (usually at least a request and a result
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   198
    set).
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   199
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    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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   202
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    The following attributes should be set on concret appobject classes:
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   204
    :__registry__:
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      name of the registry for this object (string like 'views',
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   206
      'templates'...)
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   207
    :id:
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      object's identifier in the registry (string like 'main',
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      'primary', 'folder_box')
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   210
    :__select__:
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   211
      class'selector
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   212
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   213
    Moreover, the `__abstract__` attribute may be set to True to indicate
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    that a appobject is abstract and should not be registered.
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0
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    At registration time, the following attributes are set on the class:
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    :vreg:
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      the instance's registry
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    :schema:
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      the instance's schema
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    :config:
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      the instance's configuration
0
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    At selection time, the following attributes are set on the instance:
0
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    :req:
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      current request
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    :rset:
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      context result set or None
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   229
    :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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    :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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    id = None
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    __select__ = yes()
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    @classmethod
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    def classid(cls):
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        """returns a unique identifier for the appobject"""
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        return '%s.%s' % (cls.__module__, cls.__name__)
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    # XXX bw compat code
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    @classmethod
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    def build___select__(cls):
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        for klass in cls.mro():
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            if klass.__name__ == 'AppObject':
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                continue # the bw compat __selector__ is there
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            klassdict = klass.__dict__
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            if ('__select__' in klassdict and '__selectors__' in klassdict
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                and '__selgenerated__' not in klassdict):
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                raise TypeError("__select__ and __selectors__ can't be used together on class %s" % cls)
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            if '__selectors__' in klassdict and '__selgenerated__' not in klassdict:
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                cls.__selgenerated__ = True
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                # case where __selectors__ is defined locally (but __select__
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                # is in a parent class)
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                selectors = klassdict['__selectors__']
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                if len(selectors) == 1:
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                    # micro optimization: don't bother with AndSelector if there's
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                    # only one selector
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                    select = _instantiate_selector(selectors[0])
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                else:
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                    select = AndSelector(*selectors)
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                cls.__select__ = select
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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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        cls.build___select__()
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        cls.vreg = registry.vreg
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        cls.register_properties()
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        return cls
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    @classmethod
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    def vreg_initialization_completed(cls):
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        pass
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    # properties definition:
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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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    property_defs = {}
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    @classmethod
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    def register_properties(cls):
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        for propid, pdef in cls.property_defs.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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            cls.vreg.register_property(cls.propkey(propid), **pdef)
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    @classmethod
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    def propkey(cls, propid):
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        return '%s.%s.%s' % (cls.__registry__, cls.id, propid)
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    def __init__(self, req=None, rset=None, row=None, col=None, **extra):
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        super(AppObject, self).__init__()
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        self.req = req
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        self.rset = rset
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        self.row = row
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        self.col = col
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        self.extra_kwargs = extra
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    def propval(self, propid):
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        assert self.req
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        return self.req.property_value(self.propkey(propid))
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    def view(self, __vid, rset=None, __fallback_oid=None, __registry='views',
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             **kwargs):
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        """shortcut to self.vreg.view method avoiding to pass self.req"""
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        return self.vreg[__registry].render(__vid, self.req, __fallback_oid,
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                                            rset=rset, **kwargs)
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    # deprecated ###############################################################
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    @classproperty
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    @deprecated('[3.4] use __select__ and & or | operators')
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    def __selectors__(cls):
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        selector = cls.__select__
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        if isinstance(selector, AndSelector):
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            return tuple(selector.selectors)
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        if not isinstance(selector, tuple):
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            selector = (selector,)
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        return selector
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   341
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   342
    @classmethod
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   343
    @deprecated('[3.5] use vreg.schema')
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   344
    def schema(cls):
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   345
        return cls.vreg.schema
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diff changeset
   346
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diff changeset
   347
    @classmethod
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diff changeset
   348
    @deprecated('[3.5] use vreg.config')
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   349
    def schema(cls):
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parents: 2789
diff changeset
   350
        return cls.vreg.config
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diff changeset
   351
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   352
    @deprecated('[3.5] use req.varmaker')
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   353
    def initialize_varmaker(self):
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   354
        self.varmaker = self.req.varmaker
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diff changeset
   355
2796
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diff changeset
   356
    @deprecated('[3.5] use req.get_cache')
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   357
    def get_cache(self, cachename):
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   358
        return self.req.get_cache(cachename)
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diff changeset
   359
2798
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parents: 2796
diff changeset
   360
    @deprecated('[3.5] use req.build_url')
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parents: 2796
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   361
    def build_url(self, *args, **kwargs):
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parents: 2796
diff changeset
   362
        return self.req.build_url(*args, **kwargs)
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parents: 2796
diff changeset
   363
2792
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parents: 2789
diff changeset
   364
    @deprecated('[3.5] use rset.limited_rql')
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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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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parents: 2789
diff changeset
   367
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parents: 2789
diff changeset
   368
    @deprecated('[3.5] use self.rset.complete_entity(row,col) instead')
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diff changeset
   369
    def complete_entity(self, row, col=0, skip_bytes=True):
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diff changeset
   370
        return self.rset.complete_entity(row, col, skip_bytes)
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parents: 2789
diff changeset
   371
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   372
    @deprecated('[3.5] use self.rset.get_entity(row,col) instead')
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   373
    def entity(self, row, col=0):
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parents: 2789
diff changeset
   374
        return self.rset.get_entity(row, col)
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parents: 2789
diff changeset
   375
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   376
    @deprecated('[3.5] use req.user_rql_callback')
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parents: 2789
diff changeset
   377
    def user_rql_callback(self, args, msg=None):
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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diff changeset
   378
        return self.req.user_rql_callback(args, msg)
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parents: 2789
diff changeset
   379
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   380
    @deprecated('[3.5] use req.user_callback')
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   381
    def user_callback(self, cb, args, msg=None, nonify=False):
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   382
        return self.req.user_callback(cb, args, msg, nonify)
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parents: 2789
diff changeset
   383
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   384
    @deprecated('[3.5] use req.format_date')
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
    def format_date(self, date, date_format=None, time=False):
2792
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diff changeset
   386
        return self.req.format_date(date, date_format, time)
0
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parents:
diff changeset
   387
2792
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parents: 2789
diff changeset
   388
    @deprecated('[3.5] use req.format_timoe')
0
b97547f5f1fa Showtime !
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parents:
diff changeset
   389
    def format_time(self, time):
2792
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   390
        return self.req.format_time(time)
0
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parents:
diff changeset
   391
2792
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parents: 2789
diff changeset
   392
    @deprecated('[3.5] use req.format_float')
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
    def format_float(self, num):
2792
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parents: 2789
diff changeset
   394
        return self.req.format_float(num)
1524
1d7575f5deaf delete-trailing-whitespaces
sylvain.thenault@logilab.fr
parents: 1398
diff changeset
   395
2792
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   396
    @deprecated('[3.5] use req.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'):
2792
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents: 2789
diff changeset
   398
        return self.req.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
de974465d381 [appobject] kill VObject class, move base selector classes to appobject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2656
diff changeset
   400
set_log_methods(AppObject, getLogger('cubicweb.appobject'))