/**
     * Some utility functions for working with extensions.
     *
     * @author Daniel Siepmann <[email protected]>
     */
    class Tx_YourHelpers_Utility_ExtensionUtility extends Tx_Extbase_Utility_Extension {

        /**
         * Get the extension name from the given class.
         *
         * Takes loaded extension in account. If the extension is not loaded
         * it will not return the name.
         *
         * @param  string $classname The classname you want the extension name from.
         * @return boolean           The extension name or an empty string if
         *                 extension name could not get or the extension is not loaded.
         *
         * @author Daniel Siepmann <[email protected]>
         */
        public function getExtensionNameFromClassname( $classname ) {
            $extKey = '';
            $extensionName = '';

            list( , $extensionName ) = explode( '_', $classname );

            if (empty( $extensionName )) {
                return '';
            }

            $extKey = t3lib_div::camelCaseToLowerCaseUnderscored( $extensionName );
            if (t3lib_extMgm::isLoaded( $extKey ) === true) {
                return $extensionName;
            }
            return '';
        }

        /**
         * Get the extension key from the given class.
         *
         * @param  string $classname The classname you want the extension key from.
         * @return string            The extension key  or an empty string if
         *                extension name could not get or the extension is not loaded.
         *
         * @author Daniel Siepmann <[email protected]>
         */
        public function getExtensionKeyFromClassname( $classname ) {
            $extensionName = $this->getExtensionNameFromClassname( $classname );
            if (empty( $extensionName )) {
                return $extensionName;
            }

            return t3lib_div::camelCaseToLowerCaseUnderscored( $extensionName );
        }
    }