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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 array_keys; |
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use function array_merge as these; |
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use function array_values as allThese; |
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use function assert as makeSureThat; |
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use function get_class as theClassOfThe; |
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use function is_null as weDidNotYetList; |
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use function is_object as itIsAn; |
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use function spl_object_id as theInstanceIdOf; |
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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 $objectWith; |
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private $entityIdFor; |
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private $objects; |
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private function __construct(array $objectsByClassAndId, array $idsByObject) |
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{ |
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$this->objectWith = $objectsByClassAndId; |
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$this->entityIdFor = $idsByObject; |
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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 object[] $theseObjects 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 $theseObjects): MapsObjectsByIdentity |
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{ |
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$objects = []; |
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$entityIds = []; |
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foreach ($theseObjects as $id => $object) { |
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$objects = IdentityMap::addTo($objects, (string) $id, $object); |
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$entityIds[theInstanceIdOf($object)] = (string) $id; |
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} |
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return new self($objects, $entityIds); |
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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->objectWith[$class][$id]); |
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} |
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/** @inheritdoc */ |
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public function hasThe(object $object): bool |
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{ |
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return isset($this->entityIdFor[theInstanceIdOf($object)]); |
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} |
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/** @inheritdoc */ |
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public function get(string $class, string $id): object |
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{ |
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$this->mustHave($class, $id); |
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return $this->objectWith[$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, $id); |
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$new = clone $this; |
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$new->objectWith[$class][$id] = $object; |
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$new->entityIdFor[theInstanceIdOf($object)] = $id; |
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return $new; |
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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, $id); |
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$entityIdFor = $this->entityIdFor; |
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$objectWith = $this->objectWith; |
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unset( |
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$entityIdFor[theInstanceIdOf($objectWith[$class][$id])], |
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$objectWith[$class][$id] |
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); |
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return new IdentityMap($objectWith, $entityIdFor); |
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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 $this->remove(theClassOfThe($object), $this->idOf($object)); |
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} |
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/** @inheritdoc */ |
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public function idOf(object $object): string |
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{ |
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if (!isset($this->entityIdFor[theInstanceIdOf($object)])) { |
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throw IdentityNotFound::forThe($object); |
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} |
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return $this->entityIdFor[theInstanceIdOf($object)]; |
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} |
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public function objects(): array |
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{ |
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if (weDidNotYetList($this->objects)) { |
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$objects = []; |
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foreach ($this->objectWith as $class => $objectsById) { |
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$objects[] = allThese($objectsById); |
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} |
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$this->objects = these(...$objects); |
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} |
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return $this->objects; |
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} |
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/** @throws NoSuchObject */ |
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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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/** @throws AlreadyThere */ |
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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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private static function addTo( |
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array $objectsBy, |
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string $withId, |
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object $object |
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): array { |
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$objectsBy[theClassOfThe($object)][$withId] = $object; |
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return $objectsBy; |
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} |
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} |
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Stratadox /
IdentityMap
