diff --git a/src/EventSubscriber/AfterParseBase.php b/src/EventSubscriber/AfterParseBase.php
new file mode 100644
index 0000000..7459119
--- /dev/null
+++ b/src/EventSubscriber/AfterParseBase.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Drupal\feeds\EventSubscriber;
+
+use Drupal\feeds\Event\FeedsEvents;
+use Drupal\feeds\Event\ParseEvent;
+use Drupal\feeds\Exception\SkipItemException;
+use Drupal\feeds\Feeds\Item\ItemInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * A base class for manipulating parser results.
+ *
+ * @todo maybe move to contrib.
+ */
+abstract class AfterParseBase implements EventSubscriberInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events = [];
+    $events[FeedsEvents::PARSE][] = ['afterParse', FeedsEvents::AFTER];
+    return $events;
+  }
+
+  /**
+   * Acts on parser result.
+   *
+   * @param \Drupal\feeds\Event\ParseEvent $event
+   *   The parse event.
+   */
+  public function afterParse(ParseEvent $event) {
+    if (!$this->applies($event)) {
+      return;
+    }
+
+    /** @var \Drupal\feeds\Result\ParserResultInterface */
+    $result = $event->getParserResult();
+
+    for ($i = 0; $i < $result->count(); $i++) {
+      if (!$result->offsetExists($i)) {
+        break;
+      }
+
+      /** @var \Drupal\feeds\Feeds\Item\ItemInterface */
+      $item = $result->offsetGet($i);
+
+      try {
+        $this->alterItem($item, $event);
+      }
+      catch (SkipItemException $e) {
+        $result->offsetUnset($i);
+        $i--;
+      }
+    }
+  }
+
+  /**
+   * Returns if parsing should apply.
+   *
+   * @param \Drupal\feeds\Event\ParseEvent $event
+   *   The parse event.
+   *
+   * @return bool
+   *   True, if altering should continue.
+   *   False otherwise.
+   */
+  public function applies(ParseEvent $event) {
+    return TRUE;
+  }
+
+  /**
+   * Alters a single item.
+   *
+   * @param \Drupal\feeds\Feeds\Item\ItemInterface
+   *   The item to make modifications on.
+   * @param \Drupal\feeds\Event\ParseEvent $event
+   *   The parse event.
+   *
+   * @throws \Drupal\Feeds\Exception\SkipItemException
+   *   In case the item should not be imported.
+   */
+  protected function alterItem(ItemInterface $item, ParseEvent $event) {}
+
+}
\ No newline at end of file
diff --git a/src/Exception/SkipItemException.php b/src/Exception/SkipItemException.php
new file mode 100644
index 0000000..0cde4b0
--- /dev/null
+++ b/src/Exception/SkipItemException.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Drupal\feeds\Exception;
+
+/**
+ * Thrown if the import of a single item should be skipped.
+ */
+class SkipItemException extends FeedsRuntimeException {}