public function desiccate(Tree $tree) { $writer = new StringWriter(); foreach ($tree->getNodes() as $node) { $writer->writeString8($node->getOctalModeString()); $writer->writeString8(' '); $writer->writeString8($node->getName()); $writer->writeString8(""); $sha = $node->getRelatedObject()->getSha(); if (strlen($sha) != 40) { throw new NotPersistedException("Object referred to by node named " . $node->getName() . " is not persisted yet."); } $writer->writeHHex($sha); } $data = $writer->toString(); return new RawObject('tree', $data); }