interfaces.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 20 May 2010 20:47:55 +0200
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child 5871 b21eb3e90a10
permissions -rw-r--r--
[entity] introduce a new 'adapters' registry This changeset introduces the notion in adapters (as in Zope Component Architecture) in a cubicweb way, eg using a specific registry of appobjects. This allows nicer code structure, by avoid clutering entity classes and moving code usually specific to a place of the ui (or something else) together with the code that use the interface. We don't use actual interface anymore, they are implied by adapters (which may be abstract), whose reg id is an interface name. Appobjects that used to 'implements(IFace)' should now be rewritten by: * coding an IFaceAdapter(EntityAdapter) defining (implementing if desired) the interface, usually with __regid__ = 'IFace' * use "adaptable('IFace')" as selector instead Also, the implements_adapter_compat decorator eases backward compatibility with adapter's methods that may still be found on entities implementing the interface. Notice that unlike ZCA, we don't support automatic adapters chain (yagni?). All interfaces defined in cubicweb have been turned into adapters, also some new ones have been introduced to cleanup Entity / AnyEntity classes namespace. At the end, the pluggable mixins mecanism should disappear in favor of adapters as well.
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Standard interfaces. Deprecated in favor of adapters.
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.. note::
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  The `implements` selector used to match not only entity classes but also their
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  interfaces. This will disappear in a future version. You should define an
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  adapter for that interface and use `adaptable('MyIFace')` selector on appobjects
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  that require that interface.
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"""
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__docformat__ = "restructuredtext en"
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from logilab.common.interface import Interface
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# XXX deprecates in favor of IProgressAdapter
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class IProgress(Interface):
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    """something that has a cost, a state and a progression"""
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    @property
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    def cost(self):
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        """the total cost"""
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    @property
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    def done(self):
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        """what is already done"""
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    @property
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    def todo(self):
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        """what remains to be done"""
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    def progress_info(self):
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        """returns a dictionary describing progress/estimated cost of the
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        version.
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        - mandatory keys are (''estimated', 'done', 'todo')
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        - optional keys are ('notestimated', 'notestimatedcorrected',
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          'estimatedcorrected')
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        'noestimated' and 'notestimatedcorrected' should default to 0
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        'estimatedcorrected' should default to 'estimated'
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        """
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    def finished(self):
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        """returns True if status is finished"""
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    def in_progress(self):
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        """returns True if status is not finished"""
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    def progress(self):
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        """returns the % progress of the task item"""
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# XXX deprecates in favor of IMileStoneAdapter
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class IMileStone(IProgress):
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    """represents an ITask's item"""
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    parent_type = None # specify main task's type
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    def get_main_task(self):
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        """returns the main ITask entity"""
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    def initial_prevision_date(self):
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        """returns the initial expected end of the milestone"""
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    def eta_date(self):
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        """returns expected date of completion based on what remains
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        to be done
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        """
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    def completion_date(self):
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        """returns date on which the subtask has been completed"""
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    def contractors(self):
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        """returns the list of persons supposed to work on this task"""
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# XXX deprecates in favor of IEmbedableAdapter
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class IEmbedable(Interface):
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    """interface for embedable entities"""
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    def embeded_url(self):
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        """embed action interface"""
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# XXX deprecates in favor of ICalendarAdapter
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class ICalendarViews(Interface):
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    """calendar views interface"""
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    def matching_dates(self, begin, end):
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        """
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        :param begin: day considered as begin of the range (`DateTime`)
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        :param end: day considered as end of the range (`DateTime`)
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        :return:
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          a list of dates (`DateTime`) in the range [`begin`, `end`] on which
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          this entity apply
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        """
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# XXX deprecates in favor of ICalendarableAdapter
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class ICalendarable(Interface):
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    """interface for items that do have a begin date 'start' and an end date 'stop'
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    """
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    @property
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    def start(self):
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        """return start date"""
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    @property
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    def stop(self):
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        """return stop state"""
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# XXX deprecates in favor of ICalendarableAdapter
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class ITimetableViews(Interface):
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    """timetable views interface"""
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    def timetable_date(self):
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        """XXX explain
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        :return: date (`DateTime`)
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        """
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# XXX deprecates in favor of IGeocodableAdapter
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class IGeocodable(Interface):
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    """interface required by geocoding views such as gmap-view"""
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    @property
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    def latitude(self):
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        """returns the latitude of the entity"""
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    @property
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    def longitude(self):
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        """returns the longitude of the entity"""
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    def marker_icon(self):
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        """returns the icon that should be used as the marker"""
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# XXX deprecates in favor of ISIOCItemAdapter
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class ISiocItem(Interface):
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    """interface for entities which may be represented as an ISIOC item"""
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    def isioc_content(self):
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        """return item's content"""
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    def isioc_container(self):
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        """return container entity"""
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    def isioc_type(self):
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        """return container type (post, BlogPost, MailMessage)"""
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    def isioc_replies(self):
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        """return replies items"""
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    def isioc_topics(self):
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        """return topics items"""
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# XXX deprecates in favor of ISIOCContainerAdapter
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class ISiocContainer(Interface):
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    """interface for entities which may be represented as an ISIOC container"""
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    def isioc_type(self):
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        """return container type (forum, Weblog, MailingList)"""
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    def isioc_items(self):
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        """return contained items"""
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# XXX deprecates in favor of IEmailableAdapter
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class IFeed(Interface):
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    """interface for entities with rss flux"""
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    def rss_feed_url(self):
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        """"""
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# XXX deprecates in favor of IDownloadableAdapter
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class IDownloadable(Interface):
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    """interface for downloadable entities"""
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    def download_url(self): # XXX not really part of this interface
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        """return an url to download entity's content"""
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    def download_content_type(self):
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        """return MIME type of the downloadable content"""
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    def download_encoding(self):
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        """return encoding of the downloadable content"""
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    def download_file_name(self):
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        """return file name of the downloadable content"""
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    def download_data(self):
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        """return actual data of the downloadable content"""
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# XXX deprecates in favor of IPrevNextAdapter
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class IPrevNext(Interface):
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    """interface for entities which can be linked to a previous and/or next
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    entity
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    """
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    def next_entity(self):
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        """return the 'next' entity"""
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    def previous_entity(self):
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        """return the 'previous' entity"""
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# XXX deprecates in favor of IBreadCrumbsAdapter
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class IBreadCrumbs(Interface):
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    def breadcrumbs(self, view, recurs=False):
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        pass
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# XXX deprecates in favor of ITreeAdapter
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class ITree(Interface):
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    def parent(self):
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        """returns the parent entity"""
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    def children(self):
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        """returns the item's children"""
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    def children_rql(self):
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        """XXX returns RQL to get children"""
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    def iterchildren(self):
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        """iterates over the item's children"""
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    def is_leaf(self):
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        """returns true if this node as no child"""
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    def is_root(self):
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        """returns true if this node has no parent"""
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    def root(self):
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        """returns the root object"""
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