eZ\Publish\Core\Repository\RoleService::loadRoles PHP Method

    public function loadRoles()
    {
        if ($this->repository->hasAccess('role', 'read') !== true) {
            throw new UnauthorizedException('role', 'read');
        }
        $spiRoles = $this->userHandler->loadRoles();
        $roles = array();
        foreach ($spiRoles as $spiRole) {
            $roles[] = $this->roleDomainMapper->buildDomainRoleObject($spiRole);
        }
        return $roles;
    }