Context condition for Parent node of node has term (#1053)

Co-authored-by: Jonathan Hunt <git@huntdesign.co.nz>

src/Plugin/Condition/ParentNodeOfNodeHasTerm.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\islandora\Plugin\Condition;
+
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides a 'term' condition for a node's parent.
+ *
+ * Like parent_node_has_term but applicable to a node instead of media.
+ * Like node_has_term but applicable to parent node.
+ * A typical use case is to test for a child node within a compound item.
+ *
+ * @Condition(
+ *   id = "parent_node_of_node_has_term",
+ *   label = @Translation("Parent node for node has term with URI"),
+ *   context_definitions = {
+ *     "node" = @ContextDefinition("entity:node", required = TRUE , label = @Translation("node"))
+ *   }
+ * )
+ */
+class ParentNodeOfNodeHasTerm extends NodeHasTerm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form = parent::buildConfigurationForm($form, $form_state);
+    // Make term not required.
+    $form['term']['#required'] = FALSE;
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function evaluate() {
+    if (empty($this->configuration['uri']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
+    $node = $this->getContextValue('node');
+    if (!$node) {
+      return FALSE;
+    }
+
+    $fields = [$this->utils::MEMBER_OF_FIELD];
+    $parentIds = $this->utils->findAncestors($node, $fields, 1);
+    if (!$parentIds) {
+      return FALSE;
+    }
+    $result = 0;
+    foreach ($parentIds as $parentId) {
+      $parent = $this->entityTypeManager->getStorage('node')->load($parentId);
+      if ($parent) {
+        $parentResult = $this->evaluateEntity($parent);
+        $result = $result + (int) $parentResult;
+      }
+    }
+    return (boolean) $result;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function summary() {
+    if (!empty($this->configuration['negate'])) {
+      return $this->t('The parent node is not associated with taxonomy term with uri @uri.', ['@uri' => $this->configuration['uri']]);
+    }
+    else {
+      return $this->t('The parent node is associated with taxonomy term with uri @uri.', ['@uri' => $this->configuration['uri']]);
+    }
+  }
+
+}