search_api-8.x-1.15/tests/search_api_test/src/Plugin/search_api/data_type/AlteringValueTestDataType.php

<?php

namespace Drupal\search_api_test\Plugin\search_api\data_type;

use Drupal\Component\Plugin\DependentPluginInterface;
use Drupal\search_api\DataType\DataTypePluginBase;

/**
 * Provides a dummy data type for testing purposes.
 *
 * @SearchApiDataType(
 *   id = "search_api_test_altering",
 *   label = @Translation("Altering test data type"),
 *   description = @Translation("Altering dummy data type implementation")
 * )
 */
class AlteringValueTestDataType extends DataTypePluginBase implements DependentPluginInterface {

  /**
   * {@inheritdoc}
   */
  public function getValue($value) {
    return strlen($value);
  }

  /**
   * {@inheritdoc}
   */
  public function calculateDependencies() {
    return \Drupal::state()->get('search_api_test.data_type.dependencies', []);
  }

}