RevTag.php

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<?php
class RevTag {
    protected static $schema = false;

    public static function checkSchema() {
        if ( self::$schema !== false ) {
            return self::$schema;
        } else {
            $dbr = wfGetDB( DB_SLAVE );
            if ( $dbr->tableExists( 'revtag_type' ) ) {
                return self::$schema = 1;
            } else {
                return self::$schema = 2;
            }
        }
    }

    public static function getType( $tag ) {
        if ( self::checkSchema() === 2 ) {
            return $tag;
        }

        $tags = self::loadTags();

        if ( isset( $tags[$tag] ) ) {
            return $tags[$tag];
        } else {
            $text = "Unknown revtag $tag. Known are " . implode( ', ', array_keys( $tags ) );
            throw new MWException( $text );
        }
    }

    public static function typeToTag( $tag ) {
        if ( self::checkSchema() === 2 ) {
            return $tag;
        }

        $tags = self::loadTags();
        $tags = array_flip( $tags );

        if ( isset( $tags[$tag] ) ) {
            return $tags[$tag];
        } else {
            $text = "Unknown revtag type $tag. Known are " . implode( ', ', array_keys( $tags ) );
            throw new MWException( $text );
        }
    }

    protected static function loadTags() {
        static $tags = null;
        if ( $tags === null ) {
            $tags = array();

            $dbr = wfGetDB( DB_SLAVE );
            $res = $dbr->select(
                'revtag_type',
                array( 'rtt_name', 'rtt_id' ),
                array(),
                __METHOD__
            );

            foreach ( $res as $row ) {
                $tags[$row->rtt_name] = $row->rtt_id;
            }
        }

        return $tags;
    }
}