diff core/lib/Drupal/Component/Plugin/Derivative/DeriverBase.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Component/Plugin/Derivative/DeriverBase.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,35 @@
+<?php
+
+namespace Drupal\Component\Plugin\Derivative;
+
+/**
+ * Provides a basic deriver.
+ */
+abstract class DeriverBase implements DeriverInterface {
+
+  /**
+   * List of derivative definitions.
+   *
+   * @var array
+   */
+  protected $derivatives = [];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinition($derivative_id, $base_plugin_definition) {
+    if (!empty($this->derivatives) && !empty($this->derivatives[$derivative_id])) {
+      return $this->derivatives[$derivative_id];
+    }
+    $this->getDerivativeDefinitions($base_plugin_definition);
+    return $this->derivatives[$derivative_id];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinitions($base_plugin_definition) {
+    return $this->derivatives;
+  }
+
+}