silverstripe-blog/code/compat/widgets/ArchiveWidget.php

<?php

if(!class_exists('Widget')) {
	return;
}

/**
 * @deprecated since version 2.0
 *
 * @property string $DisplayMode
 * @property string $ArchiveType
 */
class ArchiveWidget extends BlogArchiveWidget implements MigratableObject {
	/**
	 * @var array
	 */
	private static $db = array(
		'DisplayMode' => 'Varchar',
	);

	/**
	 * @var array
	 */
	private static $only_available_in = array(
		'none',
	);

	/**
	 * {@inheritdoc}
	 */
	public function canCreate($member = null) {
		return false;
	}

	/**
	 * {@inheritdoc}
	 */
	public function up() {
		if($this->DisplayMode) {
			$this->ArchiveType = 'Monthly';

			if($this->DisplayMode === 'year') {
				$this->ArchiveType = 'Yearly';
			}
		}

		$this->ClassName = 'BlogArchiveWidget';
		$this->write();
		return "Migrated " . $this->ArchiveType . " archive widget";

	}
}