class FieldPluginBase

abstract class FieldPluginBase extends PluginBase implements MigrateFieldInterface {
    
    /**
     * {@inheritdoc}
     */
    public function alterFieldMigration(MigrationInterface $migration) {
        $process[0]['map'][$this->pluginId][$this->pluginId] = $this->pluginId;
        $migration->mergeProcessOfProperty('type', $process);
    }
    
    /**
     * {@inheritdoc}
     */
    public function alterFieldInstanceMigration(MigrationInterface $migration) {
        // Nothing to do by default with field instances.
    }
    
    /**
     * {@inheritdoc}
     */
    public function alterFieldWidgetMigration(MigrationInterface $migration) {
        $process = [];
        foreach ($this->getFieldWidgetMap() as $source_widget => $destination_widget) {
            $process['type']['map'][$source_widget] = $destination_widget;
        }
        $migration->mergeProcessOfProperty('options/type', $process);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldFormatterType(Row $row) {
        return $row->getSourceProperty('formatter/type');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldFormatterMap() {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldWidgetType(Row $row) {
        return $row->getSourceProperty('widget/type');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldWidgetMap() {
        // By default, use the plugin ID for the widget types.
        return [
            $this->pluginId => $this->pluginId . '_default',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function alterFieldFormatterMigration(MigrationInterface $migration) {
        $process = [];
        // Some migrate field plugin IDs are prefixed with 'd6_' or 'd7_'. Since the
        // plugin ID is used in the static map as the module name, we have to remove
        // this prefix from the plugin ID.
        $plugin_id = preg_replace('/d[67]_/', '', $this->pluginId);
        foreach ($this->getFieldFormatterMap() as $source_format => $destination_format) {
            $process[0]['map'][$plugin_id][$source_format] = $destination_format;
        }
        $migration->mergeProcessOfProperty('options/type', $process);
    }
    
    /**
     * {@inheritdoc}
     */
    public function defineValueProcessPipeline(MigrationInterface $migration, $field_name, $data) {
        $process = [
            'plugin' => 'get',
            'source' => $field_name,
        ];
        $migration->mergeProcessOfProperty($field_name, $process);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldType(Row $row) {
        $field_type = $row->getSourceProperty('type');
        if (isset($this->pluginDefinition['type_map'][$field_type])) {
            return $this->pluginDefinition['type_map'][$field_type];
        }
        else {
            return $field_type;
        }
    }

}