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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 as theClassOfThe; |
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use function get_class; |
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/** |
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* Contains objects by class and id. |
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* |
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* @author Stratadox |
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*/ |
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final class IdentityMap implements MapsObjectsByIdentity |
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{ |
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private $map; |
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private function __construct(array $map) |
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{ |
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$this->map = $map; |
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} |
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/** |
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* Produces a new identity map that contains the objects. |
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* |
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* @param array $objects The objects to add, as [id => object] |
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* @return MapsObjectsByIdentity The map of objects. |
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*/ |
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public static function with(array $objects): MapsObjectsByIdentity |
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{ |
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$map = []; |
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foreach ($objects as $id => $object) { |
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$map = IdentityMap::addTo($map, (string) $id, $object); |
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} |
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return new self($map); |
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} |
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/** |
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* Produces an empty identity map. |
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* |
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* @return MapsObjectsByIdentity The empty map of objects. |
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*/ |
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public static function startEmpty(): MapsObjectsByIdentity |
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{ |
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return new self([]); |
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} |
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/** @inheritdoc */ |
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public function has(string $class, string $id): bool |
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{ |
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return isset($this->map[$class][$id]); |
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} |
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/** @inheritdoc */ |
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public function get(string $class, string $id): object |
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{ |
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$this->mustHave($class, $id); |
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return $this->map[$class][$id]; |
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} |
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/** @inheritdoc */ |
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public function add(string $id, object $object): MapsObjectsByIdentity |
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{ |
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$class = theClassOfThe($object); |
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$this->mayNotAlreadyHave($class, $id); |
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$map = $this->map; |
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$map[$class][$id] = $object; |
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return new IdentityMap($map); |
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} |
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/** @inheritdoc */ |
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public function remove(string $class, string $id): MapsObjectsByIdentity |
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{ |
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$this->mustHave($class, $id); |
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$map = $this->map; |
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unset($map[$class][$id]); |
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return new IdentityMap($map); |
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} |
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/** @inheritdoc */ |
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public function idOf(object $object): string |
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{ |
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$this->mustKnowThisTypeOf($object); |
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foreach ($this->map[get_class($object)] as $id => $mappedObject) { |
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if ($object === $mappedObject) { |
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return (string) $id; |
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} |
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} |
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throw IdentityNotFound::forThe($object); |
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} |
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/** |
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* Asserts that the object of the class with this id is present in the map. |
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* |
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* @param string $class The class of the object to check for. |
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* @param string $id The identity of the object, unique per class. |
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* @throws NoSuchObject When there is no object with this id in the map. |
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*/ |
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private function mustHave(string $class, string $id): void |
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{ |
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if ($this->has($class, $id)) { |
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return; |
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} |
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throw IdentityNotFound::requesting($class, $id); |
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} |
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/** |
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* Asserts that the object of the class with this id is not already there. |
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* |
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* @param string $class The class of the object to check for. |
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* @param string $id The identity of the object, unique per class. |
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* @throws AlreadyThere When there is already an object with this id. |
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*/ |
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private function mayNotAlreadyHave(string $class, string $id): void |
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{ |
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if ($this->has($class, $id)) { |
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throw DuplicationDetected::in($class, $id); |
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} |
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} |
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/** |
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* Asserts that the class of the object is known to the identity map. |
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* |
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* @param object $object The object whose class must be known. |
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* @throws NoSuchObject When there are no objects of this class in the map. |
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*/ |
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private function mustKnowThisTypeOf(object $object): void |
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{ |
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if (!isset($this->map[get_class($object)])) { |
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throw IdentityNotFound::forThe($object); |
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} |
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} |
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/** |
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* Adds the object to the map, returning the new map. |
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* |
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* @param array $map The original map. |
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* @param string $id The id of the object to add. |
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* @param object $object The object instance to add. |
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* @return array A new map that includes the new object. |
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*/ |
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private static function addTo(array $map, string $id, object $object): array |
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{ |
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$map[theClassOfThe($object)][$id] = $object; |
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return $map; |
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} |
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} |
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Stratadox /
IdentityMap
