Issue #3245810: Move ValidationResult and related infrastructure into Package Manager

package_manager/src/Event/StageEvent.php

@@ -2,10 +2,48 @@
 
 namespace Drupal\package_manager\Event;
 
+use Drupal\package_manager\ValidationResult;
 use Symfony\Contracts\EventDispatcher\Event;
 
 /**
  * Base class for all events related to the life cycle of the staging area.
  */
 abstract class StageEvent extends Event {
+
+  /**
+   * The validation results.
+   *
+   * @var \Drupal\package_manager\ValidationResult[]
+   */
+  protected $results = [];
+
+  /**
+   * Gets the validation results.
+   *
+   * @param int|null $severity
+   *   (optional) The severity for the results to return. Should be one of the
+   *   SystemManager::REQUIREMENT_* constants.
+   *
+   * @return \Drupal\package_manager\ValidationResult[]
+   *   The validation results.
+   */
+  public function getResults(?int $severity = NULL): array {
+    if ($severity !== NULL) {
+      return array_filter($this->results, function ($result) use ($severity) {
+        return $result->getSeverity() === $severity;
+      });
+    }
+    return $this->results;
+  }
+
+  /**
+   * Adds a validation result.
+   *
+   * @param \Drupal\package_manager\ValidationResult $validation_result
+   *   The validation result.
+   */
+  public function addValidationResult(ValidationResult $validation_result): void {
+    $this->results[] = $validation_result;
+  }
+
 }