commit 9c13641bb25b9c3ba2526817ac9a0f46bd5b611e
Author: Florian Weber <florian.weber@ueberbit.de>
Date:   Tue Nov 10 22:56:28 2015 +0100

    Deprecate processFieldWidget

diff --git a/core/modules/field/migration_templates/d6_field_instance.yml b/core/modules/field/migration_templates/d6_field_instance.yml
index aa7861a..de21142 100644
--- a/core/modules/field/migration_templates/d6_field_instance.yml
+++ b/core/modules/field/migration_templates/d6_field_instance.yml
@@ -46,14 +46,12 @@ process:
       - widget_type
       - widget_settings
       - global_settings
-
   default_value_callback: ''
   default_value:
     plugin: d6_field_instance_defaults
     source:
       - widget_type
       - widget_settings
-
 destination:
   plugin: entity:field_config
 migration_dependencies:
diff --git a/core/modules/field/migration_templates/d6_field_instance_widget_settings.yml b/core/modules/field/migration_templates/d6_field_instance_widget_settings.yml
index d34648d..275bb4f 100644
--- a/core/modules/field/migration_templates/d6_field_instance_widget_settings.yml
+++ b/core/modules/field/migration_templates/d6_field_instance_widget_settings.yml
@@ -41,20 +41,9 @@ process:
   entity_type: 'constants/entity_type'
   'options/weight': weight
   'options/type':
-    type:
-      plugin: static_map
-      bypass: true
-      source: widget_type
-      map:
-        number: number
-        email_textfield: email_default
-        date_select: datetime_default
-        date_text: datetime_default
-        imagefield_widget: image_image
-        phone_textfield: telephone_default
-        optionwidgets_onoff: boolean_checkbox
-        optionwidgets_buttons: options_buttons
-        optionwidgets_select: options_select
+    plugin: field_instance_widget_type
+    source:
+      - widget_type
   'options/settings':
     -
       plugin: field_instance_widget_settings
@@ -62,7 +51,6 @@ process:
         - widget_type
         - widget_settings
   'options/third_party_settings': 'constants/third_party_settings'
-
 destination:
   plugin: component_entity_form_display
 migration_dependencies:
diff --git a/core/modules/field/src/Plugin/migrate/process/d6/FieldWidgetType.php b/core/modules/field/src/Plugin/migrate/process/d6/FieldWidgetType.php
new file mode 100644
index 0000000..a30d84c
--- /dev/null
+++ b/core/modules/field/src/Plugin/migrate/process/d6/FieldWidgetType.php
@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\field\Plugin\migrate\process\d6\FieldWidgetType.
+ */
+
+namespace Drupal\field\Plugin\migrate\process\d6;
+
+use Drupal\Component\Plugin\Exception\PluginNotFoundException;
+use Drupal\Component\Plugin\PluginManagerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Get the field instance widget type.
+ *
+ * @MigrateProcessPlugin(
+ *   id = "field_instance_widget_type"
+ * )
+ */
+class FieldWidgetType extends ProcessPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The cckfield plugin manager.
+   *
+   * @var \Drupal\Component\Plugin\PluginManagerInterface
+   */
+  protected $cckPluginManager;
+
+  /**
+   * Constructs a FieldSettings plugin.
+   *
+   * @param array $configuration
+   *   The plugin configuration.
+   * @param string $plugin_id
+   *   The plugin ID.
+   * @param mixed $plugin_definition
+   *   The plugin definition.
+   * @param \Drupal\Component\Plugin\PluginManagerInterface $cck_plugin_manager
+   *   The cckfield plugin manager.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, PluginManagerInterface $cck_plugin_manager) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->cckPluginManager = $cck_plugin_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('plugin.manager.migrate.cckfield')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    $source_widget_type = $row->getSourceProperty('widget_type');
+    $source_field_type = $row->getSourceProperty('type');
+
+    try {
+      return $this->cckPluginManager->createInstance($source_field_type)
+        ->transformWidgetType($row);
+    }
+    catch (PluginNotFoundException $e) {
+      return $this->getWidget($source_widget_type);
+    }
+  }
+
+  /**
+   * Returns widget for a given source widget type.
+   *
+   * @param $source_widget_type
+   *
+   * @return string|null
+   */
+  protected function getWidget($source_widget_type) {
+    $map = [
+      'number' => 'number',
+      'email_textfield' => 'email_default',
+      'date_select' => 'datetime_default',
+      'date_text' => 'datetime_default',
+      'imagefield_widget' => 'image_image',
+      'phone_textfield' => 'telephone_default',
+      'optionwidgets_onoff' => 'boolean_checkbox',
+      'optionwidgets_buttons' => 'options_buttons',
+      'optionwidgets_select' => 'options_select',
+    ];
+    return isset($map[$source_widget_type]) ? $map[$source_widget_type] : NULL;
+  }
+
+}
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php b/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php
index 010b56f..d3c6ee2 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/cckfield/CckFieldPluginBase.php
@@ -44,11 +44,13 @@ public function processFieldInstance(MigrationInterface $migration) {
    * {@inheritdoc}
    */
   public function processFieldWidget(MigrationInterface $migration) {
+    /*
     $process = [];
     foreach ($this->getFieldWidgetMap() as $source_widget => $destination_widget) {
       $process['type']['map'][$source_widget] = $destination_widget;
     }
     $migration->mergeProcessOfProperty('options/type', $process);
+    */
   }
 
   /**
@@ -100,4 +102,13 @@ public function transformFieldInstanceSettings(Row $row) {
     return [];
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function transformWidgetType(Row $row) {
+    $source_widget_type = $row->getSourceProperty('widget_type');
+    $map = $this->getFieldWidgetMap();
+    return isset($map[$source_widget_type]) ? $map[$source_widget_type] : NULL;
+  }
+
 }