/// <summary>
/// Write entries directory to pages. If pages not enough for new directory - additional pages will allocated.
/// Also write header and pageAllocator state
/// </summary>
public void Write(Stream stm, PagedContainerHeader header, PageAllocator pageAllocator)
{
var targetPages = pages;
var buff = entries.WriteEntries(header.DataHandler);
var requiredPages = header.GetRequiredPages(buff.Length);
if (requiredPages > targetPages.Length) // need to allocate additional pages?
{
targetPages = targetPages.Concat(pageAllocator.AllocatePages(requiredPages - targetPages.Length)).ToArray();
}
else if (requiredPages < targetPages.Length) // can free unused pages?
{
var mustBeFreePages = targetPages.Skip(requiredPages).ToArray();
targetPages = targetPages.Take(requiredPages).ToArray();
pageAllocator.FreePages(mustBeFreePages);
}
stm.WriteIntoPages(header, buff, 0, targetPages);
header.DirectoryFirstPage = targetPages[0];
header.Write(stm);
pageAllocator.Write(stm);
pages = targetPages;
}
/// <summary>
/// Remove entries by keys. Mask * and ? supported.
/// Return deleted keys.
/// </summary>
public virtual string[] Delete(params string[] keys)
{
throwIfHasOpenedStream(keys);
var r = new List <string>();
foreach (var entry in entries.Find(keys).ToArray())
{
r.Add(entry.Name);
var pages = Stream.ReadPageSequence(Header, entry.FirstPage);
pageAllocator.FreePages(pages);
entries.Remove(entry);
}
if (Flags.HasFlag(PersistentContainerFlags.WriteDirImmediately))
{
WriteHeaders();
}
return(r.ToArray());
}