<?PHP
declare(strict_types = 1);

/**
 * Exception thrown in case an erroneously duplicate link is to be entered in a
 * linking table.
 */
class MDDuplicateLinkException extends Exception {

    /**
     * Error message.
     *
     * @return string
     */
    public function errorMessage() {

        //error message
        $errorMsg = 'Duplicate link exception: ' . $this->getMessage() . '.';
        return $errorMsg;

    }

}