public IndexPage GetFreeIndexPage()
{
var freeIndexPage = CacheIndexPage.GetPage(Header.FreeIndexPageID);
// Check if "free page" has no more index to be used
if (freeIndexPage.NodeIndex >= IndexPage.NODES_PER_PAGE - 1)
{
Header.LastPageID++; // Take last page and increase
Header.IsDirty = true;
var newIndexPage = new IndexPage(Header.LastPageID); // Create a new index page
freeIndexPage.NextPageID = newIndexPage.PageID; // Point older page to the new page
Header.FreeIndexPageID = Header.LastPageID; // Update last index page
CacheIndexPage.AddPage(freeIndexPage, true);
return(newIndexPage);
}
else
{
// Has more free index on same index page? return them
freeIndexPage.NodeIndex++; // Reserve space
return(freeIndexPage);
}
}
public bool Delete(Guid id)
{
// Search index node from guid
var indexNode = Search(id);
// If null, not found (return false)
if (indexNode == null)
{
return(false);
}
// Delete the index node logicaly
indexNode.IsDeleted = true;
// Add page (from index node) to cache and set as dirty
CacheIndexPage.AddPage(indexNode.IndexPage, true);
// Mark all data blocks (from data pages) as IsEmpty = true
DataFactory.MarkAsEmpty(indexNode.DataPageID, this);
// Set header as Dirty to be saved on dispose
Header.IsDirty = true;
return(true); // Confirma a exclusão
}