StringLongItem.php

<?php

namespace Drupal\Core\Field\Plugin\Field\FieldType;

use Drupal\Component\Utility\Random;
use Drupal\Core\Field\Attribute\FieldType;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Defines the 'string_long' field type.
 */
class StringLongItem extends StringItemBase {
    
    /**
     * {@inheritdoc}
     */
    public static function schema(FieldStorageDefinitionInterface $field_definition) {
        return [
            'columns' => [
                'value' => [
                    'type' => $field_definition->getSetting('case_sensitive') ? 'blob' : 'text',
                    'size' => 'big',
                ],
            ],
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
        $random = new Random();
        $values['value'] = $random->paragraphs();
        return $values;
    }

}