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

core/modules/migrate/src/Plugin/MigrateSourceInterface.php

@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\migrate\Plugin\MigrateSourceInterface.
+ */
+
+namespace Drupal\migrate\Plugin;
+use Drupal\Component\Plugin\PluginInspectionInterface;
+use Drupal\migrate\Row;
+
+/**
+ * Defines an interface for migrate sources.
+ *
+ * @see \Drupal\migrate\Plugin\MigratePluginManager
+ * @see \Drupal\migrate\Annotation\MigrateSource
+ * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
+ * @see plugin_api
+ *
+ * @ingroup migration
+ */
+interface MigrateSourceInterface extends \Countable, \Iterator, PluginInspectionInterface {
+
+  /**
+   * Returns available fields on the source.
+   *
+   * @return array
+   *   Available fields in the source, keys are the field machine names as used
+   *   in field mappings, values are descriptions.
+   */
+  public function fields();
+
+  /**
+   * Returns the iterator that will yield the row arrays to be processed.
+   *
+   * @return \Iterator
+   *   The iterator object.
+   *
+   * @throws \Exception
+   *   Cannot obtain a valid iterator.
+   */
+  public function getIterator();
+
+  /**
+   * Add additional data to the row.
+   *
+   * @param \Drupal\Migrate\Row $row
+   *   The row object.
+   *
+   * @return bool
+   *   FALSE if this row needs to be skipped.
+   */
+  public function prepareRow(Row $row);
+
+  public function __toString();
+
+  /**
+   * Get the source ids.
+   *
+   * @return array
+   *   The source ids.
+   */
+  public function getIds();
+
+}