add_to_calendar-1.0.0-beta5/src/Plugin/Field/FieldType/AddToCalendarItem.php

<?php

namespace Drupal\add_to_calendar\Plugin\Field\FieldType;

use Drupal\Component\Utility\Random;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\TypedData\DataDefinition;
use Drupal\Core\StringTranslation\TranslatableMarkup;


/**
 * Defines the 'add_to_calendar' field type.
 *
 * @FieldType(
 *   id = "add_to_calendar",
 *   label = @Translation("Add to calendar"),
 *   category = @Translation("General"),
 *   default_widget = "string_textfield",
 *   default_formatter = "add_to_calendar_default"
 * )
 */
class AddToCalendarItem extends FieldItemBase {

  /**
   * {@inheritdoc}
   */
  public function isEmpty() {
    $value = $this->get('value')->getValue();
    return $value === NULL || $value === '';
  }

  /**
   * {@inheritdoc}
   */
  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
    $properties['value'] = DataDefinition::create('string')
      ->setLabel(new TranslatableMarkup('Add to calendar'))
      ->setRequired(TRUE);

    return $properties;
  }

  /**
   * {@inheritdoc}
   */
  public static function schema(FieldStorageDefinitionInterface $field_definition) {

    $columns = [
      'value' => [
        'type' => 'varchar',
        'not null' => FALSE,
        'description' => 'Add to calendar.',
        'length' => 255,
      ],
    ];

    $schema = [
      'columns' => $columns,
    ];

    return $schema;
  }

  /**
   * {@inheritdoc}
   */
  public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
    $random = new Random();
    $values['value'] = $random->word(mt_rand(1, 50));
    return $values;
  }

}