Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Gettext/PoMetadataInterface.php

@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Gettext\PoMetadataInterface.
+ */
+
+namespace Drupal\Component\Gettext;
+
+use Drupal\Component\Gettext\PoHeader;
+
+/**
+ * Methods required for both reader and writer implementations.
+ *
+ * @see \Drupal\Component\Gettext\PoReaderInterface
+ * @see \Drupal\Component\Gettext\PoWriterInterface
+ */
+interface PoMetadataInterface {
+
+  /**
+   * Set language code.
+   *
+   * @param string $langcode
+   *   Language code string.
+   */
+  public function setLangcode($langcode);
+
+  /**
+   * Get language code.
+   *
+   * @return string
+   *   Language code string.
+   */
+  public function getLangcode();
+
+  /**
+   * Set header metadata.
+   *
+   * @param \Drupal\Component\Gettext\PoHeader $header
+   *   Header object representing metadata in a PO header.
+   */
+  public function setHeader(PoHeader $header);
+
+  /**
+   * Get header metadata.
+   *
+   * @return \Drupal\Component\Gettext\PoHeader $header
+   *   Header instance representing metadata in a PO header.
+   */
+  public function getHeader();
+
+}