Refactor: extract FilePathNameIterator

This change makes it easy for the depending libraries to use iterable of
`SplFileInfo`, adapted to the format of `ColocatedMappingDriver` file paths.
For example, one could provide an instance of Symfony Finder, adapted with
`FilePathNameIterator` without having to reinvent it from scratch.

Author: rela589n

src/Persistence/Mapping/Driver/ColocatedMappingDriver.php

@@ -7,7 +7,6 @@
 use AppendIterator;
 use Doctrine\Persistence\Mapping\MappingException;
 use FilesystemIterator;
-use Generator;
 use Iterator;
 use RecursiveDirectoryIterator;
 use RecursiveIteratorIterator;
@@ -156,7 +155,8 @@ public function getAllClassNames(): array
             $filesIterator->append($iterator);
         }
 
-        $sourceFilePathNames = $this->pathNameIterator($filesIterator);
+        /** @var iterable<string> $sourceFilePathNames */
+        $sourceFilePathNames = new FilePathNameIterator($filesIterator);
         /** @var array<string,true> $includedFiles */
         $includedFiles = [];
 
@@ -201,16 +201,4 @@ public function getAllClassNames(): array
 
         return $classes;
     }
-
-    /**
-     * @param iterable<SplFileInfo> $filesIterator
-     *
-     * @return Generator<int,string>
-     */
-    private function pathNameIterator(iterable $filesIterator): Generator
-    {
-        foreach ($filesIterator as $file) {
-            yield $file->getPathname();
-        }
-    }
 }

src/Persistence/Mapping/Driver/FilePathNameIterator.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Persistence\Mapping\Driver;
+
+use Generator;
+use IteratorAggregate;
+use SplFileInfo;
+
+/** @implements IteratorAggregate<int,string> */
+final class FilePathNameIterator implements IteratorAggregate
+{
+    public function __construct(
+        /** @var iterable<SplFileInfo> */
+        private readonly iterable $filesIterator,
+    ) {
+    }
+
+    /** @return Generator<int,string> */
+    public function getIterator(): Generator
+    {
+        foreach ($this->filesIterator as $file) {
+            yield $file->getPathname();
+        }
+    }
+}