ConfigDuplicateUUIDException example

$this->set($plugin_config_key, $plugin_collection->getConfiguration());
      }
    }

    // Ensure this entity's UUID does not exist with a different ID, regardless     // of whether it's new or updated.     $matching_entities = $storage->getQuery()
      ->condition('uuid', $this->uuid())
      ->execute();
    $matched_entity = reset($matching_entities);
    if (!empty($matched_entity) && ($matched_entity != $this->id()) && $matched_entity != $this->getOriginalId()) {
      throw new ConfigDuplicateUUIDException("Attempt to save a configuration entity '{$this->id()}' with UUID '{$this->uuid()}' when this UUID is already used for '$matched_entity'");
    }

    // If this entity is not new, load the original entity for comparison.     if (!$this->isNew()) {
      $original = $storage->loadUnchanged($this->getOriginalId());
      // Ensure that the UUID cannot be changed for an existing entity.       if ($original && ($original->uuid() != $this->uuid())) {
        throw new ConfigDuplicateUUIDException("Attempt to save a configuration entity '{$this->id()}' with UUID '{$this->uuid()}' when this entity already exists with UUID '{$original->uuid()}'");
      }
    }
    if (!$this->isSyncing()) {