Version 1

[yaffs-website] / web / core / lib / Drupal / Component / Plugin / Derivative / DeriverBase.php

diff --git a/web/core/lib/Drupal/Component/Plugin/Derivative/DeriverBase.php b/web/core/lib/Drupal/Component/Plugin/Derivative/DeriverBase.php
new file mode 100644 (file)
index 0000000..f49ab99
--- /dev/null
+++ b/web/core/lib/Drupal/Component/Plugin/Derivative/DeriverBase.php
@@ -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;
+  }
+
+}