public function __construct(FileInterface $file, TableSchemaInterface $tableSchema, IndexSchema $indexPage = null, $forkRate = 33)
{
$keyLength = 0;
foreach ($indexPage->getColumns() as $columnId) {
/* @var $columnPage ColumnSchema */
$columnPage = $tableSchema->getColumn($columnId);
assert(!is_null($columnPage));
$keyLength += $columnPage->getCellSize();
}
if ($keyLength < 4) {
$keyLength = 4;
}
if (!is_numeric($forkRate)) {
throw new \ErrorException("Forkrate has to specified as integer!");
}
$forkRate = (int) $forkRate;
$this->file = $file;
$this->setKeyLength($keyLength);
$this->forkRate = $forkRate;
$this->tableSchema = $tableSchema;
$this->indexPage = $indexPage;
// if file is empty, initialize it
if ($file->getLength() <= 1) {
$file->setData(str_pad("", $keyLength * 8, ""));
$rootNode = new BTreeNodePage();
$rootNode->setKeyLength($keyLength);
$rootNode->setForkRate($this->forkRate);
// make sure root-reference is in index 1, not 0.
// that way we can use reference 0 as 'not defined'/'not used'
$this->setRootReference(1);
$this->writeNode($rootNode, 1);
}
}
