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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));
}
}
}
}