public MGRB Copy()
{
if (_containers.Count() > 0)
{
var o = Serialize();
var m = new MGRB();
m.Deserialize(o);
return(m);
}
return(new MGRB());
}
internal void SavePageList(SafeSortedList <T, PageInfo> _pages, List <int> diskpages)
{
lock (_fileLock)
{
T[] keys = _pages.Keys();
int blocknum = 0;
// TODO : needed??
//if (_externalStrings)
//{
// if (_pagelistalllocblock != null)
// _strings.FreeBlocks(_pagelistalllocblock);
// blocknum = _strings.SaveData("pagelist", BJSON.ToBJSON(keys,
// new BJSONParameters { UseUnicodeStrings = false, UseTypedArrays = false }));
// File.WriteAllBytes(_FileName + ".pagelist", Helper.GetBytes(blocknum, false));
//}
// save page list
int c = (_pages.Count() / Global.PageItemCount) + 1;
// allocate pages needed
while (c > diskpages.Count)
{
diskpages.Add(GetNewPageNumber());
}
byte[] page = new byte[_PageLength];
for (int i = 0; i < (diskpages.Count - 1); i++)
{
byte[] block = CreateBlockHeader(1, Global.PageItemCount, diskpages[i + 1]);
Buffer.BlockCopy(block, 0, page, 0, block.Length);
for (int j = 0; j < Global.PageItemCount; j++)
{
CreatePageListData(_pages, i * Global.PageItemCount, block.Length, j, page, blocknum);
}
SeekPage(diskpages[i]);
_file.Write(page, 0, page.Length);
}
c = _pages.Count() % Global.PageItemCount;
byte[] lastblock = CreateBlockHeader(1, (ushort)c, -1);
Buffer.BlockCopy(lastblock, 0, page, 0, lastblock.Length);
int lastoffset = (_pages.Count() / Global.PageItemCount) * Global.PageItemCount;
for (int j = 0; j < c; j++)
{
CreatePageListData(_pages, lastoffset, lastblock.Length, j, page, blocknum);
}
SeekPage(diskpages[diskpages.Count - 1]);
_file.Write(page, 0, page.Length);
}
}
public MGIndex(string path, string filename, byte keysize, bool allowdups)
{
if (Global.UseLessMemoryStructures)
{
_cache = new SafeSortedList <int, Page <T> >();
}
else
{
_cache = new SafeDictionary <int, Page <T> >();
}
_AllowDuplicates = allowdups;
if (path.EndsWith(Path.DirectorySeparatorChar.ToString()) == false)
{
path += Path.DirectorySeparatorChar;
}
_index = new IndexFile <T>(path + filename, keysize);
// load page list
_index.GetPageList(_pageListDiskPages, _pageList, out _LastIndexedRecordNumber);
if (_pageList.Count() == 0)
{
Page <T> page = new Page <T>();
page.FirstKey = (T)RDBDataType <T> .GetEmpty();
page.DiskPageNumber = _index.GetNewPageNumber();
page.isDirty = true;
_pageList.Add(page.FirstKey, new PageInfo(page.DiskPageNumber, 0, 0));
_cache.Add(page.DiskPageNumber, page);
}
}