Adds callback an dateformat sep

src/Step/Callback.php

@@ -0,0 +1,44 @@
+<?php
+
+
+namespace PolderKnowledge\Importer\Step;
+
+
+use PolderKnowledge\Importer\Reader\Reader;
+use Zend\Db\Sql\Ddl\Column\Datetime;
+
+final class Callback implements Step
+{
+    /**
+     * @var Step
+     */
+    private $step;
+
+    private $key;
+
+    private $callback;
+
+    public function __construct($key, callable $callback)
+    {
+        $this->key = $key;
+        $this->callback = $callback;
+    }
+
+    /**
+     * @return \Generator
+     */
+    public function fetch()
+    {
+        foreach ($this->step->fetch() as $item) {
+            $value = $item[$this->key];
+
+            $item[$this->key] = call_user_func($this->callback, $value, $item);
+            yield $item;
+        }
+    }
+
+    public function attach(Reader $step)
+    {
+        $this->step = $step;
+    }
+}

src/Step/DateFormat.php

@@ -0,0 +1,44 @@
+<?php
+
+
+namespace PolderKnowledge\Importer\Step;
+
+
+use PolderKnowledge\Importer\Reader\Reader;
+use Zend\Db\Sql\Ddl\Column\Datetime;
+
+final class DateFormat implements Step
+{
+    /**
+     * @var Step
+     */
+    private $step;
+
+    private $key;
+
+    private $format;
+
+    public function __construct($key, $format)
+    {
+        $this->key = $key;
+        $this->format = $format;
+    }
+
+    /**
+     * @return \Generator
+     */
+    public function fetch()
+    {
+        foreach ($this->step->fetch() as $item) {
+            $value = $item[$this->key];
+
+            $item[$this->key] = \DateTime::createFromFormat($this->format, $value)->format('Y-m-d');
+            yield $item;
+        }
+    }
+
+    public function attach(Reader $step)
+    {
+        $this->step = $step;
+    }
+}