TelephoneItem.php

<?php

namespace Drupal\telephone\Plugin\Field\FieldType;

use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\TypedData\DataDefinition;

/**
 * Plugin implementation of the 'telephone' field type.
 *
 * @FieldType(
 *   id = "telephone",
 *   label = @Translation("Telephone number"),
 *   description = @Translation("This field stores a telephone number in the database."),
 *   category = @Translation("Number"),
 *   default_widget = "telephone_default",
 *   default_formatter = "basic_string"
 * )
 */
class TelephoneItem extends FieldItemBase {
    
    /**
     * {@inheritdoc}
     */
    public static function schema(FieldStorageDefinitionInterface $field_definition) {
        return [
            'columns' => [
                'value' => [
                    'type' => 'varchar',
                    'length' => 256,
                ],
            ],
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
        $properties['value'] = DataDefinition::create('string')->setLabel(t('Telephone number'))
            ->setRequired(TRUE);
        return $properties;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isEmpty() {
        $value = $this->get('value')
            ->getValue();
        return $value === NULL || $value === '';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConstraints() {
        $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
        $constraints = parent::getConstraints();
        $max_length = 256;
        $constraints[] = $constraint_manager->create('ComplexData', [
            'value' => [
                'Length' => [
                    'max' => $max_length,
                    'maxMessage' => t('%name: the telephone number may not be longer than @max characters.', [
                        '%name' => $this->getFieldDefinition()
                            ->getLabel(),
                        '@max' => $max_length,
                    ]),
                ],
            ],
        ]);
        return $constraints;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
        $values['value'] = rand(pow(10, 8), pow(10, 9) - 1);
        return $values;
    }

}