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PageReference.php
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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Page;
use MediaWiki\DAO\WikiAwareEntity;
use Stringable;
/**
* Interface for objects (potentially) representing a page that can be viewable and linked to
* on a wiki. This includes special pages.
*
* The identity of any PageReference object is defined by the
* namespace, the dbkey, and the wiki ID.
* If the wiki ID is self::LOCAL, the identity is relative to the local wiki.
*
* @note For compatibility with the Title class, PageReference instances
* may for represent things that are not viewable pages, such as interwiki links
* and section links. This is intended to change in the future.
*
* @note Instances of Title shall be the only instances of PageReference that are not
* viewable pages. Other classes implementing PageReference must not permit an empty DB key.
* The idea is that once Title has been removed, all PageReference are then viewable pages.
*
* @note Code that deserializes instances of PageReference must ensure that the original
* meaning of the "local" Wiki ID is preserved if the PageReference originated on
* another wiki.
*
* @see https://www.mediawiki.org/wiki/Manual:Modeling_pages
*
* @stable to type
* @since 1.37
* @ingroup Page
*/
interface PageReference extends Stringable, WikiAwareEntity {
/**
* Get the ID of the wiki this page belongs to.
*
* @return string|false The wiki's logical name,
* or self::LOCAL to indicate the local wiki.
*/
public function getWikiId();
/**
* Returns the page's namespace number.
*
* The value returned by this method should represent a valid namespace,
* but this cannot be guaranteed in all cases.
*
* @return int
*/
public function getNamespace(): int;
/**
* Get the page title in DB key form.
*
* @note This may return a string starting with a hash, if the PageReference represents
* the target of a block or unblock operation. This is due to the way the block target
* is represented in the logging table. This is intended to change in the future.
*
* @note This may return an empty string, if this PageReference is a Title that represents
* a relative section link. This is intended to change in the future.
*
* @return string
*/
public function getDBkey(): string;
/**
* Checks whether the given PageReference refers to the same page as this PageReference.
*
* Two PageReference instances are considered to refer to the same page if
* they belong to the same wiki, and have the same namespace and DB key.
*
* @param PageReference $other
*
* @return bool
*/
public function isSamePageAs( PageReference $other ): bool;
/**
* Returns an informative human readable unique representation of the page identity,
* for use as a cache key and for logging and debugging.
*
* @return string
*/
public function __toString(): string;
}

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