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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Security\Core\Role; /** * RoleHierarchy defines a role hierarchy. * * @author Fabien Potencier <fabien@symfony.com> */ class RoleHierarchy implements RoleHierarchyInterface { private $hierarchy; private $map; /** * Constructor. * * @param array $hierarchy An array defining the hierarchy */ public function __construct(array $hierarchy) { $this->hierarchy = $hierarchy; $this->buildRoleMap(); } /** * {@inheritdoc} */ public function getReachableRoles(array $roles) { $reachableRoles = $roles; foreach ($roles as $role) { if (!isset($this->map[$role->getRole()])) { continue; } foreach ($this->map[$role->getRole()] as $r) { $reachableRoles[] = new Role($r); } } return $reachableRoles; } private function buildRoleMap() { $this->map = array(); foreach ($this->hierarchy as $main => $roles) { $this->map[$main] = $roles; $visited = array(); $additionalRoles = $roles; while ($role = array_shift($additionalRoles)) { if (!isset($this->hierarchy[$role])) { continue; } $visited[] = $role; $this->map[$main] = array_unique(array_merge($this->map[$main], $this->hierarchy[$role])); $additionalRoles = array_merge($additionalRoles, array_diff($this->hierarchy[$role], $visited)); } } } }