add adapter repository for snapshot store

src/Snapshot/AdapterRepository.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Patchlevel\EventSourcing\Snapshot;
+
+use Patchlevel\EventSourcing\Snapshot\Adapter\SnapshotAdapter;
+
+interface AdapterRepository
+{
+    public function get(string $name): SnapshotAdapter;
+}

src/Snapshot/DefaultAdapterRepository.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Patchlevel\EventSourcing\Snapshot;
+
+use Patchlevel\EventSourcing\Snapshot\Adapter\SnapshotAdapter;
+
+use function array_key_exists;
+
+final class DefaultAdapterRepository implements AdapterRepository
+{
+    /** @param array<string, SnapshotAdapter> $snapshotAdapters */
+    public function __construct(
+        private readonly array $snapshotAdapters,
+    ) {
+    }
+
+    public function get(string $name): SnapshotAdapter
+    {
+        if (!array_key_exists($name, $this->snapshotAdapters)) {
+            throw new AdapterNotFound($name);
+        }
+
+        return $this->snapshotAdapters[$name];
+    }
+}

src/Snapshot/DefaultSnapshotStore.php

@@ -15,20 +15,29 @@
 use Throwable;
 
 use function array_key_exists;
+use function is_array;
 use function sprintf;
 
 final class DefaultSnapshotStore implements SnapshotStore
 {
+    private AdapterRepository $adapterRepository;
+
     private Hydrator $hydrator;
 
     private AggregateRootMetadataFactory $metadataFactory;
 
-    /** @param array<string, SnapshotAdapter> $snapshotAdapters */
+    /** @param array<string, SnapshotAdapter>|AdapterRepository $snapshotAdapters */
     public function __construct(
-        private array $snapshotAdapters,
+        array|AdapterRepository $adapterRepository,
         Hydrator|null $hydrator = null,
         AggregateRootMetadataFactory|null $metadataFactory = null,
     ) {
+        if (is_array($adapterRepository)) {
+            $this->adapterRepository = new DefaultAdapterRepository($adapterRepository);
+        } else {
+            $this->adapterRepository = $adapterRepository;
+        }
+
         $this->hydrator = $hydrator ?? new MetadataHydrator();
         $this->metadataFactory = $metadataFactory ?? new AggregateRootMetadataAwareMetadataFactory();
     }
@@ -91,11 +100,7 @@ public function adapter(string $aggregateClass): SnapshotAdapter
             throw new SnapshotNotConfigured($aggregateClass);
         }
 
-        if (!array_key_exists($adapterName, $this->snapshotAdapters)) {
-            throw new AdapterNotFound($adapterName);
-        }
-
-        return $this->snapshotAdapters[$adapterName];
+        return $this->adapterRepository->get($adapterName);
     }
 
     /** @param class-string<AggregateRoot> $aggregateClass */
@@ -116,7 +121,7 @@ private function version(string $aggregateClass): string|null
     public static function createDefault(array $snapshotAdapters, PayloadCryptographer|null $cryptographer = null): self
     {
         return new self(
-            $snapshotAdapters,
+            new DefaultAdapterRepository($snapshotAdapters),
             new MetadataHydrator(cryptographer: $cryptographer),
         );
     }

tests/Unit/Snapshot/DefaultAdapterRepositoryTest.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Patchlevel\EventSourcing\Tests\Unit\Snapshot;
+
+use Patchlevel\EventSourcing\Snapshot\Adapter\SnapshotAdapter;
+use Patchlevel\EventSourcing\Snapshot\AdapterNotFound;
+use Patchlevel\EventSourcing\Snapshot\DefaultAdapterRepository;
+use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
+
+/** @covers \Patchlevel\EventSourcing\Snapshot\DefaultAdapterRepository */
+final class DefaultAdapterRepositoryTest extends TestCase
+{
+    use ProphecyTrait;
+
+    public function testGetAdapter(): void
+    {
+        $adapter = $this->prophesize(SnapshotAdapter::class);
+        $repository = new DefaultAdapterRepository(['memory' => $adapter->reveal()]);
+
+        self::assertSame($adapter->reveal(), $repository->get('memory'));
+    }
+
+    public function testAdapterNotFound(): void
+    {
+        $this->expectException(AdapterNotFound::class);
+
+        $repository = new DefaultAdapterRepository([]);
+        $repository->get('memory');
+    }
+}