PHPSessionHandler: Implement SessionHandlerInterface

[mediawiki.git] / includes / site / SiteList.php

<?php

/**
 * Collection of Site objects.
 *
 * 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
 *
 * @since 1.21
 *
 * @file
 * @ingroup Site
 *
 * @license GNU GPL v2+
 * @author Jeroen De Dauw < jeroendedauw@gmail.com >
 */
class SiteList extends GenericArrayObject {
        /**
         * Internal site identifiers pointing to their sites offset value.
         *
         * @since 1.21
         *
         * @var array Array of integer
         */
        protected $byInternalId = array();

        /**
         * Global site identifiers pointing to their sites offset value.
         *
         * @since 1.21
         *
         * @var array Array of string
         */
        protected $byGlobalId = array();

        /**
         * Navigational site identifiers alias inter-language prefixes
         * pointing to their sites offset value.
         *
         * @since 1.23
         *
         * @var array Array of string
         */
        protected $byNavigationId = array();

        /**
         * @see GenericArrayObject::getObjectType
         *
         * @since 1.21
         *
         * @return string
         */
        public function getObjectType() {
                return 'Site';
        }

        /**
         * @see GenericArrayObject::preSetElement
         *
         * @since 1.21
         *
         * @param int|string $index
         * @param Site $site
         *
         * @return bool
         */
        protected function preSetElement( $index, $site ) {
                if ( $this->hasSite( $site->getGlobalId() ) ) {
                        $this->removeSite( $site->getGlobalId() );
                }

                $this->byGlobalId[$site->getGlobalId()] = $index;
                $this->byInternalId[$site->getInternalId()] = $index;

                $ids = $site->getNavigationIds();
                foreach ( $ids as $navId ) {
                        $this->byNavigationId[$navId] = $index;
                }

                return true;
        }

        /**
         * @see ArrayObject::offsetUnset()
         *
         * @since 1.21
         *
         * @param mixed $index
         */
        public function offsetUnset( $index ) {
                if ( $this->offsetExists( $index ) ) {
                        /**
                         * @var Site $site
                         */
                        $site = $this->offsetGet( $index );

                        unset( $this->byGlobalId[$site->getGlobalId()] );
                        unset( $this->byInternalId[$site->getInternalId()] );

                        $ids = $site->getNavigationIds();
                        foreach ( $ids as $navId ) {
                                unset( $this->byNavigationId[$navId] );
                        }
                }

                parent::offsetUnset( $index );
        }

        /**
         * Returns all the global site identifiers.
         * Optionally only those belonging to the specified group.
         *
         * @since 1.21
         *
         * @return array
         */
        public function getGlobalIdentifiers() {
                return array_keys( $this->byGlobalId );
        }

        /**
         * Returns if the list contains the site with the provided global site identifier.
         *
         * @param string $globalSiteId
         *
         * @return bool
         */
        public function hasSite( $globalSiteId ) {
                return array_key_exists( $globalSiteId, $this->byGlobalId );
        }

        /**
         * Returns the Site with the provided global site identifier.
         * The site needs to exist, so if not sure, call hasGlobalId first.
         *
         * @since 1.21
         *
         * @param string $globalSiteId
         *
         * @return Site
         */
        public function getSite( $globalSiteId ) {
                return $this->offsetGet( $this->byGlobalId[$globalSiteId] );
        }

        /**
         * Removes the site with the specified global site identifier.
         * The site needs to exist, so if not sure, call hasGlobalId first.
         *
         * @since 1.21
         *
         * @param string $globalSiteId
         */
        public function removeSite( $globalSiteId ) {
                $this->offsetUnset( $this->byGlobalId[$globalSiteId] );
        }

        /**
         * Returns if the list contains no sites.
         *
         * @since 1.21
         *
         * @return bool
         */
        public function isEmpty() {
                return $this->byGlobalId === array();
        }

        /**
         * Returns if the list contains the site with the provided site id.
         *
         * @param int $id
         *
         * @return bool
         */
        public function hasInternalId( $id ) {
                return array_key_exists( $id, $this->byInternalId );
        }

        /**
         * Returns the Site with the provided site id.
         * The site needs to exist, so if not sure, call has first.
         *
         * @since 1.21
         *
         * @param int $id
         *
         * @return Site
         */
        public function getSiteByInternalId( $id ) {
                return $this->offsetGet( $this->byInternalId[$id] );
        }

        /**
         * Removes the site with the specified site id.
         * The site needs to exist, so if not sure, call has first.
         *
         * @since 1.21
         *
         * @param int $id
         */
        public function removeSiteByInternalId( $id ) {
                $this->offsetUnset( $this->byInternalId[$id] );
        }

        /**
         * Returns if the list contains the site with the provided navigational site id.
         *
         * @param string $id
         *
         * @return bool
         */
        public function hasNavigationId( $id ) {
                return array_key_exists( $id, $this->byNavigationId );
        }

        /**
         * Returns the Site with the provided navigational site id.
         * The site needs to exist, so if not sure, call has first.
         *
         * @since 1.23
         *
         * @param string $id
         *
         * @return Site
         */
        public function getSiteByNavigationId( $id ) {
                return $this->offsetGet( $this->byNavigationId[$id] );
        }

        /**
         * Removes the site with the specified navigational site id.
         * The site needs to exist, so if not sure, call has first.
         *
         * @since 1.23
         *
         * @param string $id
         */
        public function removeSiteByNavigationId( $id ) {
                $this->offsetUnset( $this->byNavigationId[$id] );
        }

        /**
         * Sets a site in the list. If the site was not there,
         * it will be added. If it was, it will be updated.
         *
         * @since 1.21
         *
         * @param Site $site
         */
        public function setSite( Site $site ) {
                $this[] = $site;
        }

        /**
         * Returns the sites that are in the provided group.
         *
         * @since 1.21
         *
         * @param string $groupName
         *
         * @return SiteList
         */
        public function getGroup( $groupName ) {
                $group = new self();

                /**
                 * @var Site $site
                 */
                foreach ( $this as $site ) {
                        if ( $site->getGroup() === $groupName ) {
                                $group[] = $site;
                        }
                }

                return $group;
        }

        /**
         * A version ID that identifies the serialization structure used by getSerializationData()
         * and unserialize(). This is useful for constructing cache keys in cases where the cache relies
         * on serialization for storing the SiteList.
         *
         * @var string A string uniquely identifying the version of the serialization structure,
         *             not including any sub-structures.
         */
        const SERIAL_VERSION_ID = '2014-03-17';

        /**
         * Returns the version ID that identifies the serialization structure used by
         * getSerializationData() and unserialize(), including the structure of any nested structures.
         * This is useful for constructing cache keys in cases where the cache relies
         * on serialization for storing the SiteList.
         *
         * @return string A string uniquely identifying the version of the serialization structure,
         *                including any sub-structures.
         */
        public static function getSerialVersionId() {
                return self::SERIAL_VERSION_ID . '+Site:' . Site::SERIAL_VERSION_ID;
        }

        /**
         * @see GenericArrayObject::getSerializationData
         *
         * @since 1.21
         *
         * @return array
         */
        protected function getSerializationData() {
                // NOTE: When changing the structure, either implement unserialize() to handle the
                //      old structure too, or update SERIAL_VERSION_ID to kill any caches.
                return array_merge(
                        parent::getSerializationData(),
                        array(
                                'internalIds' => $this->byInternalId,
                                'globalIds' => $this->byGlobalId,
                                'navigationIds' => $this->byNavigationId
                        )
                );
        }

        /**
         * @see GenericArrayObject::unserialize
         *
         * @since 1.21
         *
         * @param string $serialization
         *
         * @return array
         */
        public function unserialize( $serialization ) {
                $serializationData = parent::unserialize( $serialization );

                $this->byInternalId = $serializationData['internalIds'];
                $this->byGlobalId = $serializationData['globalIds'];
                $this->byNavigationId = $serializationData['navigationIds'];

                return $serializationData;
        }
}