added callback decorator

src/Decorators/CallbackDecorator.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace DMT\Import\Reader\Decorators;
+
+use Closure;
+
+class CallbackDecorator implements DecoratorInterface
+{
+
+    private Closure $callback;
+
+    public function __construct(Closure $callback)
+    {
+        $this->callback = $callback;
+    }
+
+    public function decorate(object $currentRow): object
+    {
+        return call_user_func($this->callback, $currentRow) ?? $currentRow;
+    }
+}

src/Decorators/Xml/XmlToObjectDecorator.php

@@ -29,7 +29,7 @@ public function __construct(string $fqcn, array $mapping)
      *
      * This tries to initiate and populate a DataTransferObject.
      *
-     * @param SimpleXMLElement|object $currentRow The current csv row.
+     * @param SimpleXMLElement|object $currentRow The current xml row.
      *
      * @return object Instance of an object according to type stored in fqcn.
      * @throws DecoratorException When the initialization of the object failed.

tests/Decorators/CallbackDecoratorTest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace DMT\Test\Import\Reader\Decorators;
+
+use ArrayObject;
+use Closure;
+use DMT\Import\Reader\Decorators\CallbackDecorator;
+use PHPUnit\Framework\TestCase;
+use SimpleXMLElement;
+
+class CallbackDecoratorTest extends TestCase
+{
+    /**
+     * @dataProvider provideRow
+     *
+     * @param Closure $callback
+     * @param object $currentRow
+     * @param object $expected
+     */
+    public function testDecorate(Closure $callback, object $currentRow, object $expected): void
+    {
+        $decorator = new CallbackDecorator($callback);
+
+        $this->assertEquals($expected, $decorator->decorate($currentRow));
+    }
+
+    public function provideRow(): iterable
+    {
+        return [
+            'xml' => [
+                function (SimpleXMLElement $currentRow) {
+                    $currentRow->addChild('type', (string) $currentRow->car->attributes()['type']);
+                    foreach ($currentRow->xpath('car/@*') as $attribute) {
+                        unset($attribute[0]);
+                    }
+                },
+                simplexml_load_string('<root><car type="focus">ford</car></root>'),
+                simplexml_load_string('<root><car>ford</car><type>focus</type></root>')
+            ],
+            'json' => [
+                function (object $currentRow) {
+                    $currentRow->lorem = 'ipsum';
+                },
+                json_decode('{"foo": "bar"}'),
+                (object) ['foo' => 'bar', 'lorem' => 'ipsum']
+            ],
+            'csv (pass through)' => [
+                function (object $currentRow) {
+                    $currentRow['col2'] = 'value2';
+                },
+                new ArrayObject(['col1' => 'value1']),
+                new ArrayObject(['col1' => 'value1', 'col2' => 'value2']),
+            ],
+        ];
+    }
+}