Link View Helper to create edit + new buttons in t3 backend module

LinkViewHelper.php

<?php
namespace Vendor\Ext\ViewHelpers\Form;
use Vendor\Ext\ViewHelpers\Misc\RequestViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\TagBuilder;

/***************************************************************
 * Copyright notice
 *
 * (c) 2014 Johannes Hertenstein
 *
 * All rights reserved
 *
 * This script is part of the TYPO3 project. The TYPO3 project is
 * free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The GNU General Public License can be found at
 * http://www.gnu.org/copyleft/gpl.html.
 *
 * This script is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * This copyright notice MUST APPEAR in all copies of the script!
 * ************************************************************* */

class LinkViewHelper extends AbstractViewHelper {

	/**
	 * @var TagBuilder
	 */
	protected $tag = NULL;

	/**
	 * @param string $to
	 * @param string $column
	 * @param integer $uid
	 *
	 * @return mixed
	 */
	public function render($to, $column, $uid = NULL) {
		$pid = new RequestViewHelper();
		$pid = $pid->render("id");

		$this->tag = new TagBuilder("a");
		$this->tag->addAttribute("href","#");
		$this->tag->setContent($this->renderChildren());
		$this->tag->forceClosingTag(TRUE);

		$parameter = array();

		switch($to){
			case "edit":
				$parameter[] = "edit[$column][{$uid}]=edit";
				break;

			case "new":
				$parameter[] = "edit[$column][{$pid}]=new";
				break;
		}

		$this->tag->addAttribute("href","alt_doc.php?".implode("&",$parameter));

		return $this->tag->render();
	}
}