class Node

abstract class Node {
    private DOMDocument $dom;
    private DOMElement $contextNode;
    public function __construct(DOMElement $context) {
        $this->setContextNode($context);
    }
    public function dom() : DOMDocument {
        return $this->dom;
    }
    public function totals() : Totals {
        $totalsContainer = $this->contextNode()->firstChild;
        if (!$totalsContainer) {
            $totalsContainer = $this->contextNode()
                ->appendChild($this->dom
                ->createElementNS('https://schema.phpunit.de/coverage/1.0', 'totals'));
        }
        return new Totals($totalsContainer);
    }
    public function addDirectory(string $name) : Directory {
        $dirNode = $this->dom()
            ->createElementNS('https://schema.phpunit.de/coverage/1.0', 'directory');
        $dirNode->setAttribute('name', $name);
        $this->contextNode()
            ->appendChild($dirNode);
        return new Directory($dirNode);
    }
    public function addFile(string $name, string $href) : File {
        $fileNode = $this->dom()
            ->createElementNS('https://schema.phpunit.de/coverage/1.0', 'file');
        $fileNode->setAttribute('name', $name);
        $fileNode->setAttribute('href', $href);
        $this->contextNode()
            ->appendChild($fileNode);
        return new File($fileNode);
    }
    protected function setContextNode(DOMElement $context) : void {
        $this->dom = $context->ownerDocument;
        $this->contextNode = $context;
    }
    protected function contextNode() : DOMElement {
        return $this->contextNode;
    }

}