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[yaffs-website] / web / core / lib / Drupal / Core / Entity / EntityReferenceSelection / SelectionPluginBase.php
diff --git a/web/core/lib/Drupal/Core/Entity/EntityReferenceSelection/SelectionPluginBase.php b/web/core/lib/Drupal/Core/Entity/EntityReferenceSelection/SelectionPluginBase.php
new file mode 100644 (file)
index 0000000..1e48a3e
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@@ -0,0 +1,161 @@
+<?php
+
+namespace Drupal\Core\Entity\EntityReferenceSelection;
+
+use Drupal\Component\Plugin\ConfigurablePluginInterface;
+use Drupal\Component\Utility\NestedArray;
+use Drupal\Core\Database\Query\SelectInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\PluginBase;
+
+/**
+ * Provides a base class for configurable selection handlers.
+ */
+abstract class SelectionPluginBase extends PluginBase implements SelectionInterface, ConfigurablePluginInterface {
+
+  /**
+   * Constructs a new selection object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->setConfiguration($configuration);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'target_type' => NULL,
+      // @todo Remove this key in Drupal 9.0.x.
+      'handler' => $this->getPluginId(),
+      'entity' => NULL,
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfiguration() {
+    return $this->configuration;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setConfiguration(array $configuration) {
+    // Resolve backward compatibility level configurations, if any.
+    $this->resolveBackwardCompatibilityConfiguration($configuration);
+
+    // Merge in defaults.
+    $this->configuration = NestedArray::mergeDeep(
+      $this->defaultConfiguration(),
+      $configuration
+    );
+
+    // Ensure a backward compatibility level configuration.
+    $this->ensureBackwardCompatibilityConfiguration();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateDependencies() {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public function entityQueryAlter(SelectInterface $query) {}
+
+  /**
+   * Moves the backward compatibility level configurations in the right place.
+   *
+   * In order to keep backward compatibility, we copy all settings, except
+   * 'target_type', 'handler' and 'entity' under 'handler_settings', following
+   * the structure from the field config. If the plugin was instantiated using
+   * the 'handler_settings' level, those values will be used. In case of
+   * conflict, the root level settings will take precedence. The backward
+   * compatibility aware configuration will have the next structure:
+   * - target_type
+   * - handler (will be removed in Drupal 9.0.x, it's the plugin id)
+   * - entity
+   * - setting_1
+   * - setting_2
+   *   ...
+   * - setting_N
+   * - handler_settings: (will be removed in Drupal 9.0.x)
+   *   - setting_1
+   *   - setting_2
+   *     ...
+   *   - setting_N
+   *
+   * @param array $configuration
+   *   The configuration array to be altered.
+   *
+   * @deprecated Scheduled for removal in Drupal 9.0.x.
+   *
+   * @see https://www.drupal.org/node/2870971
+   */
+  protected function resolveBackwardCompatibilityConfiguration(array &$configuration) {
+    if (isset($this->defaultConfiguration()['handler_settings'])) {
+      throw new \InvalidArgumentException("{$this->getPluginDefinition()['class']}::defaultConfiguration() should not contain a 'handler_settings' key. All settings should be placed in the root level.");
+    }
+
+    // Extract the BC level from the passed configuration, if any.
+    if (array_key_exists('handler_settings', $configuration)) {
+      if (!is_array($configuration['handler_settings'])) {
+        throw new \InvalidArgumentException("The setting 'handler_settings' is reserved and cannot be used.");
+      }
+      @trigger_error("Providing settings under 'handler_settings' is deprecated and will be removed before 9.0.0. Move the settings in the root of the configuration array. See https://www.drupal.org/node/2870971.", E_USER_DEPRECATED);
+
+      // Settings passed in the root level take precedence over BC settings.
+      $configuration += $configuration['handler_settings'];
+      unset($configuration['handler_settings']);
+    }
+  }
+
+  /**
+   * Ensures a backward compatibility level configuration.
+   *
+   * @deprecated Scheduled for removal in Drupal 9.0.x.
+   *
+   * @see https://www.drupal.org/node/2870971
+   */
+  protected function ensureBackwardCompatibilityConfiguration() {
+    $keys = ['handler', 'target_type', 'entity', 'handler_settings'];
+    // Synchronize back 'handler_settings'.
+    foreach ($this->configuration as $key => $value) {
+      // Filter out keys that belong strictly to the root level.
+      if (!in_array($key, $keys, TRUE)) {
+        $this->configuration['handler_settings'][$key] = $value;
+      }
+    }
+  }
+
+}