protected override void ReadContent(ByteReader reader)
{
this.DataBlocks = new Dictionary<ushort, DataBlock>(ItemCount);
for (var i = 0; i < ItemCount; i++)
{
var block = new DataBlock();
block.Page = this;
block.Position = new PageAddress(this.PageID, reader.ReadUInt16());
block.ExtendPageID = reader.ReadUInt32();
var size = reader.ReadUInt16();
block.Data = reader.ReadBytes(size);
this.DataBlocks.Add(block.Position.Index, block);
}
}
/// <summary>
/// Insert data inside a datapage. Returns dataPageID that idicates the first page
/// </summary>
public DataBlock Insert(CollectionPage col, byte[] data)
{
// need to extend (data is bigger than 1 page)
var extend = (data.Length + DataBlock.DATA_BLOCK_FIXED_SIZE) > BasePage.PAGE_AVAILABLE_BYTES;
// if extend, just search for a page with BLOCK_SIZE avaiable
var dataPage = _pager.GetFreePage<DataPage>(col.FreeDataPageID, extend ? DataBlock.DATA_BLOCK_FIXED_SIZE : data.Length + DataBlock.DATA_BLOCK_FIXED_SIZE);
// create a new block with first empty index on DataPage
var block = new DataBlock { Position = new PageAddress(dataPage.PageID, dataPage.DataBlocks.NextIndex()), Page = dataPage };
// if extend, store all bytes on extended page.
if (extend)
{
var extendPage = _pager.NewPage<ExtendPage>();
block.ExtendData = data;
block.ExtendPageID = extendPage.PageID;
this.StoreExtendData(extendPage, data);
}
else
{
block.Data = data;
}
// add dataBlock to this page
dataPage.DataBlocks.Add(block.Position.Index, block);
// update freebytes + items count
dataPage.UpdateItemCount();
dataPage.IsDirty = true;
// add/remove dataPage on freelist if has space
_pager.AddOrRemoveToFreeList(dataPage.FreeBytes > DataPage.DATA_RESERVED_BYTES, dataPage, col, ref col.FreeDataPageID);
col.DocumentCount++;
col.IsDirty = true;
return block;
}
public override void ReadContent(BinaryReader reader)
{
this.DataBlocks = new Dictionary<ushort, DataBlock>(ItemCount);
for (var i = 0; i < ItemCount; i++)
{
var block = new DataBlock();
block.Page = this;
block.Position = new PageAddress(this.PageID, reader.ReadUInt16());
block.ExtendPageID = reader.ReadUInt32();
for(var j = 0; j < CollectionIndex.INDEX_PER_COLLECTION; j++)
{
block.IndexRef[j] = reader.ReadPageAddress();
}
var size = reader.ReadUInt16();
block.Data = reader.ReadBytes(size);
this.DataBlocks.Add(block.Position.Index, block);
}
}
/// <summary>
/// Update byte array from existing data block. Update free space too
/// </summary>
public void UpdateBlockData(DataBlock block, byte[] data)
{
this.FreeBytes = this.FreeBytes + block.Data.Length - data.Length;
block.Data = data;
}
