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<?php |
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declare(strict_types=1); |
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namespace Stratadox\IdentityMap; |
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use function get_class; |
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use function in_array; |
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/** |
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* Whitelist for the Identity Map. |
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* |
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* Used for whitelisting entities while loading objects. |
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* |
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* @see IdentityMap |
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* |
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* @author Stratadox |
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*/ |
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final class Whitelist implements MapsObjectsByIdentity |
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{ |
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private $allow; |
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private $map; |
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private function __construct(array $allow, MapsObjectsByIdentity $map) |
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{ |
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$this->allow = $allow; |
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$this->map = $map; |
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} |
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/** |
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* Constructs a whitelist for the identity map. |
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* |
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* @param MapsObjectsByIdentity $mapped The actual identity map. |
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* @param string ...$allowedClasses The whitelisted classes. |
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* @return MapsObjectsByIdentity The wrapped identity map. |
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* @throws NoSuchObject Probably won't though. |
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*/ |
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public static function forThe( |
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MapsObjectsByIdentity $mapped, |
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string ...$allowedClasses |
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): MapsObjectsByIdentity { |
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foreach ($mapped->objects() as $object) { |
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if (Whitelist::doesNotHave($object, $allowedClasses)) { |
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$mapped = $mapped->removeThe($object); |
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} |
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} |
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return new Whitelist($allowedClasses, $mapped); |
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} |
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/** |
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* Whitelists the given classes in the identity map. |
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* |
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* @param string ...$classes The whitelisted classes. |
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* @return MapsObjectsByIdentity The wrapped identity map. |
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*/ |
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public static function the(string ...$classes): MapsObjectsByIdentity |
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{ |
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return new Whitelist($classes, IdentityMap::startEmpty()); |
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} |
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/** @inheritdoc */ |
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public function has(string $class, string $id): bool |
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{ |
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return $this->map->has($class, $id); |
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} |
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/** @inheritdoc */ |
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public function hasThe(object $object): bool |
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{ |
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return $this->map->hasThe($object); |
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} |
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/** @inheritdoc */ |
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public function get(string $class, string $id): object |
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{ |
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return $this->map->get($class, $id); |
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} |
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/** @inheritdoc */ |
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public function idOf(object $object): string |
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{ |
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return $this->map->idOf($object); |
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} |
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/** @inheritdoc */ |
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public function add(string $id, object $object): MapsObjectsByIdentity |
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{ |
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if (!in_array(get_class($object), $this->allow)) { |
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return $this; |
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} |
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return $this->newMap($this->map->add($id, $object)); |
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} |
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/** @inheritdoc */ |
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public function remove(string $class, string $id): MapsObjectsByIdentity |
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{ |
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return $this->newMap($this->map->remove($class, $id)); |
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} |
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/** @inheritdoc */ |
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public function removeThe(object $object): MapsObjectsByIdentity |
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{ |
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return $this->newMap($this->map->removeThe($object)); |
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} |
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/** @inheritdoc */ |
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public function objects(): array |
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{ |
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return $this->map->objects(); |
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} |
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private function newMap(MapsObjectsByIdentity $map): MapsObjectsByIdentity |
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{ |
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return new Whitelist($this->allow, $map); |
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} |
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private static function doesNotHave( |
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object $mapped, |
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array $allowedClasses |
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): bool { |
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foreach ($allowedClasses as $class) { |
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if ($mapped instanceof $class) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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Stratadox /
IdentityMap
