htools-8.x-1.x-dev/modules/htools_migrate/src/Plugin/migrate/process/Callback.php

<?php

namespace Drupal\htools_migrate\Plugin\migrate\process;

use Drupal\migrate\MigrateExecutableInterface;
use Drupal\migrate\Row;
use Drupal\migrate\Plugin\migrate\process\Callback as CoreCallback;

/**
 * Passes the source value to a callback.
 *
 * The callback process plugin allows simple processing of the value, such as
 * strtolower(). The callable takes the source value as the single mandatory
 * argument. No additional arguments can be passed to the callback.
 *
 * Available configuration keys:
 * - callable: The name of the callable method.
 *
 * Examples:
 *
 * @code
 * process:
 *   destination_field:
 *     plugin: callback
 *     callable: strtolower
 *     source: source_field
 * @endcode
 *
 * An example where the callable is a static method in a class:
 *
 * @code
 * process:
 *   destination_field:
 *     plugin: callback
 *     callable:
 *       - '\Drupal\Component\Utility\Unicode'
 *       - strtolower
 *     source: source_field
 * @endcode
 *
 * @see \Drupal\migrate\Plugin\MigrateProcessInterface
 */
class Callback extends CoreCallback {

  /**
   * Flag indicating whether there are multiple values.
   *
   * @var bool
   */
  protected $multiple;

  /**
   * {@inheritdoc}
   */
  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
    $result = parent::transform($value, $migrate_executable, $row, $destination_property);

    if (is_array($result)) {
      $this->multiple = TRUE;
    } else {
      $this->multiple = FALSE;
    }

    return $result;
  }

  /**
   * {@inheritdoc}
   */
  public function multiple() {
    return $this->multiple;
  }

}