Issue #2015683 by plopesc: Convert field type to typed data plugin for telephone module .

core/modules/telephone/lib/Drupal/telephone/Plugin/field/field_type/TelephoneItem.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\telephone\Plugin\field\field_type\TelephoneItem.
+ */
+
+namespace Drupal\telephone\Plugin\field\field_type;
+
+use Drupal\Core\Entity\Annotation\FieldType;
+use Drupal\Core\Annotation\Translation;
+use Drupal\field\Plugin\Type\FieldType\ConfigFieldItemBase;
+use Drupal\field\Plugin\Core\Entity\Field;
+
+/**
+ * Plugin implementation of the 'telephone' field type.
+ *
+ * @FieldType(
+ *   id = "telephone",
+ *   module = "telephone",
+ *   label = @Translation("Telephone number"),
+ *   description = @Translation("This field stores a telephone number in the database."),
+ *   default_widget = "telephone_default",
+ *   default_formatter = "telephone_link"
+ * )
+ */
+class TelephoneItem extends ConfigFieldItemBase {
+
+  /**
+   * Definitions of the contained properties.
+   *
+   * @var array
+   */
+  static $propertyDefinitions;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function schema(Field $field) {
+    return array(
+      'columns' => array(
+        'value' => array(
+          'type' => 'varchar',
+          'length' => 256,
+          'not null' => FALSE,
+        ),
+      ),
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPropertyDefinitions() {
+    if (!isset(static::$propertyDefinitions)) {
+      static::$propertyDefinitions['value'] = array(
+        'type' => 'string',
+        'label' => t('Telephone number'),
+      );
+    }
+    return static::$propertyDefinitions;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isEmpty() {
+    $value = $this->get('value')->getValue();
+    return $value === NULL || $value === '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConstraints() {
+    $constraint_manager = \Drupal::typedData()->getValidationConstraintManager();
+    $constraints = parent::getConstraints();
+
+    $max_length = 256;
+    $constraints[] = $constraint_manager->create('ComplexData', array(
+      'value' => array(
+        'Length' => array(
+          'max' => $max_length,
+          'maxMessage' => t('%name: the telephone number may not be longer than @max characters.', array('%name' => $this->getInstance()->label, '@max' => $max_length)),
+        )
+      ),
+    ));
+
+    return $constraints;
+  }
+
+}

core/modules/telephone/lib/Drupal/telephone/Type/TelephoneItem.php

-<?php
-
-/**
- * @file
- * Contains \Drupal\telephone\Type\TelephoneItem.
- */
-
-namespace Drupal\telephone\Type;
-
-use Drupal\field\Plugin\field\field_type\LegacyConfigFieldItem;
-
-/**
- * Defines the 'telephone_field' entity field items.
- */
-class TelephoneItem extends LegacyConfigFieldItem {
-
-  /**
-   * Definitions of the contained properties.
-   *
-   * @see TelephoneItem::getPropertyDefinitions()
-   *
-   * @var array
-   */
-  static $propertyDefinitions;
-
-  /**
-   * Implements ComplexDataInterface::getPropertyDefinitions().
-   */
-  public function getPropertyDefinitions() {
-    if (!isset(static::$propertyDefinitions)) {
-      static::$propertyDefinitions['value'] = array(
-        'type' => 'string',
-        'label' => t('Telephone number'),
-      );
-    }
-    return static::$propertyDefinitions;
-  }
-}

core/modules/telephone/telephone.install

-<?php
-
-/**
- * @file
- * Install, update and uninstall functions for the Telephone module.
- */
-
-/**
- * Implements hook_field_schema().
- */
-function telephone_field_schema($field) {
-  $columns = array(
-    'value' => array(
-      'type' => 'varchar',
-      'length' => 256,
-      'not null' => FALSE,
-    ),
-  );
-  return array(
-    'columns' => $columns,
-  );
-}

core/modules/telephone/telephone.module

@@ -5,36 +5,15 @@
  * Defines a simple telephone number field type.
  */
 
-/**
- * Implements hook_field_info().
- */
-function telephone_field_info() {
-  return array(
-    'telephone' => array(
-      'label' => t('Telephone number'),
-      'description' => t('This field stores a telephone number in the database.'),
-      'default_widget' => 'telephone_default',
-      'default_formatter' => 'telephone_link',
-      'class' => 'Drupal\telephone\Type\TelephoneItem',
-    ),
-  );
-}
-
 /**
  * Implements hook_field_info_alter().
  */
 function telephone_field_info_alter(&$info) {
-  if (module_exists('text')) {
+  if (Drupal::moduleHandler()->moduleExists('text')) {
     $info['telephone']['default_formatter'] = 'text_plain';
   }
 }
 
-/**
- * Implements hook_field_is_empty().
- */
-function telephone_field_is_empty($item, $field_type) {
-  return !isset($item['value']) || $item['value'] === '';
-}
 
 /**
  * Implements hook_field_formatter_info_alter().