Link.php

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<?php
namespace Magento\Sales\Block\Order;

class Link extends \Magento\Framework\View\Element\Html\Link\Current
{
    protected $_registry;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\App\DefaultPathInterface $defaultPath,
        \Magento\Framework\Registry $registry,
        array $data = []
    ) {
        parent::__construct($context, $defaultPath, $data);
        $this->_registry = $registry;
    }

    private function getOrder()
    {
        return $this->_registry->registry('current_order');
    }

    public function getHref()
    {
        return $this->getUrl($this->getPath(), ['order_id' => $this->getOrder()->getId()]);
    }

    protected function _toHtml()
    {
        if ($this->hasKey()
            && method_exists($this->getOrder(), 'has' . $this->getKey())
            && !$this->getOrder()->{'has' . $this->getKey()}()
        ) {
            return '';
        }
        return parent::_toHtml();
    }
}