RecentMessageGroup.php

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<?php
class RecentMessageGroup extends WikiMessageGroup {
    /*
     * Yes this is very ugly hack and should not be removed.
     * @see MessageCollection::getPages()
     */
    protected $namespace = false;

    protected $language;

    public function __construct() {
    }

    public function setLanguage( $code ) {
        $this->language = $code;
    }

    public function getId() {
        return '!recent';
    }

    public function getLabel( IContextSource $context = null ) {
        $msg = wfMessage( 'translate-dynagroup-recent-label' );
        $msg = self::addContext( $msg, $context );

        return $msg->plain();
    }

    public function getDescription( IContextSource $context = null ) {
        $msg = wfMessage( 'translate-dynagroup-recent-desc' );
        $msg = self::addContext( $msg, $context );

        return $msg->plain();
    }

    protected function getRCCutoff() {
        $db = wfGetDB( DB_SLAVE );
        $tables = 'recentchanges';
        $max = $db->selectField( $tables, 'MAX(rc_id)', array(), __METHOD__ );

        return max( 0, $max - 50000 );
    }

    protected function getQueryConditions() {
        global $wgTranslateMessageNamespaces;
        $db = wfGetDB( DB_SLAVE );
        $conds = array(
            'rc_title ' . $db->buildLike( $db->anyString(), '/' . $this->language ),
            'rc_namespace' => $wgTranslateMessageNamespaces,
            'rc_type != ' . RC_LOG,
            'rc_id > ' . $this->getRCCutoff(),
        );

        return $conds;
    }

    protected function matchingMessage( MessageHandle $msg ) {
        return true;
    }

    public function getDefinitions() {
        if ( !$this->language ) {
            throw new MWException( "Language not set" );
        }

        $db = wfGetDB( DB_SLAVE );
        $tables = 'recentchanges';
        $fields = array( 'rc_namespace', 'rc_title' );
        $conds = $this->getQueryConditions();
        $options = array(
            'ORDER BY' => 'rc_id DESC',
            'LIMIT' => 5000
        );
        $res = $db->select( $tables, $fields, $conds, __METHOD__, $options );

        $defs = array();
        foreach ( $res as $row ) {
            $title = Title::makeTitle( $row->rc_namespace, $row->rc_title );
            $handle = new MessageHandle( $title );

            if ( !$handle->isValid() || !$this->matchingMessage( $handle ) ) {
                continue;
            }

            $messageKey = $handle->getKey();
            $fullKey = $row->rc_namespace . ':' . $messageKey;

            /* Note: due to bugs, getMessage might return null even for
             * known messages. These negatives are not cached, but that
             * should be rare enough case to not affect performance. */
            if ( !isset( $defs[$fullKey] ) ) {
                $group = $handle->getGroup();
                $msg = $group->getMessage( $messageKey, $group->getSourceLanguage() );

                if ( $msg !== null ) {
                    $defs[$fullKey] = $msg;
                }
            }
        }

        return $defs;
    }

    public function getChecker() {
        return null;
    }

    public function getMessageContent( MessageHandle $handle ) {
        $groupId = MessageIndex::getPrimaryGroupId( $handle );
        $group = MessageGroups::getGroup( $groupId );
        if ( $group ) {
            return $group->getMessage( $handle->getKey(), $group->getSourceLanguage() );
        }

        throw new MWException( 'Could not find group for ' . $handle->getKey() );
    }
}