TranslateMetadata.php

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<?php
class TranslateMetadata {
    protected static $cache = null;

    public static function get( $group, $key ) {
        if ( self::$cache === null ) {
            $dbr = wfGetDB( DB_SLAVE );
            self::$cache = $dbr->select( 'translate_metadata', '*', array(), __METHOD__ );
        }

        foreach ( self::$cache as $row ) {
            if ( $row->tmd_group === $group && $row->tmd_key === $key ) {
                return $row->tmd_value;
            }
        }

        return false;
    }

    public static function set( $group, $key, $value ) {
        $dbw = wfGetDB( DB_MASTER );
        $data = array( 'tmd_group' => $group, 'tmd_key' => $key, 'tmd_value' => $value );
        if ( $value === false ) {
            unset( $data['tmd_value'] );
            $dbw->delete( 'translate_metadata', $data );
        } else {
            $dbw->replace(
                'translate_metadata',
                array( array( 'tmd_group', 'tmd_key' ) ),
                $data,
                __METHOD__
            );
        }

        self::$cache = null;
    }

    public static function getSubgroups( $groupId ) {
        $groups = self::get( $groupId, 'subgroups' );
        if ( $groups !== false ) {
            if ( strpos( $groups, '|' ) !== false ) {
                $groups = explode( '|', $groups );
            } else {
                $groups = array_map( 'trim', explode( ',', $groups ) );
            }

            foreach ( $groups as $index => $id ) {
                if ( trim( $id ) === '' ) {
                    unset( $groups[$index] );
                }
            }
        }

        return $groups;
    }

    public static function setSubgroups( $groupId, $subgroupIds ) {
        $subgroups = implode( '|', $subgroupIds );
        self::set( $groupId, 'subgroups', $subgroups );
    }

    public static function deleteGroup( $groupId ) {
        $dbw = wfGetDB( DB_MASTER );
        $conds = array( 'tmd_group' => $groupId );
        $dbw->delete( 'translate_metadata', $conds );
    }
}