/// <summary>
/// Update data inside a datapage. If new data can be used in same datapage, just update. Otherside, copy content to a new ExtendedPage
/// </summary>
public DataBlock Update(CollectionPage col, PageAddress blockAddress, byte[] data)
{
var dataPage = _pager.GetPage<DataPage>(blockAddress.PageID);
var block = dataPage.DataBlocks[blockAddress.Index];
var extend = dataPage.FreeBytes + block.Data.Length - data.Length <= 0;
// check if need to extend
if (extend)
{
// clear my block data
block.Data = new byte[0];
block.ExtendData = data;
// create (or get a existed) extendpage and store data there
ExtendPage extendPage;
if (block.ExtendPageID == uint.MaxValue)
{
extendPage = _pager.NewPage<ExtendPage>();
block.ExtendPageID = extendPage.PageID;
}
else
{
extendPage = _pager.GetPage<ExtendPage>(block.ExtendPageID);
}
this.StoreExtendData(extendPage, data);
}
else
{
// if no extends, just update data block
block.Data = data;
// if there was a extended bytes, delete
if (block.ExtendPageID != uint.MaxValue)
{
_pager.DeletePage(block.ExtendPageID, true);
block.ExtendPageID = uint.MaxValue;
}
}
// updates freebytes + items count
dataPage.UpdateItemCount();
// add/remove dataPage on freelist if has space AND its on/off free list
_pager.AddOrRemoveToFreeList(dataPage.FreeBytes > DataPage.DATA_RESERVED_BYTES, dataPage, col, ref col.FreeDataPageID);
dataPage.IsDirty = true;
return block;
}
/// <summary>
/// Delete indexNode from a Index ajust Next/Prev nodes
/// </summary>
public void Delete(CollectionIndex index, PageAddress nodeAddress)
{
var node = this.GetNode(nodeAddress);
var page = node.Page;
for (int i = node.Prev.Length - 1; i >= 0; i--)
{
// get previus and next nodes (between my deleted node)
var prev = this.GetNode(node.Prev[i]);
var next = this.GetNode(node.Next[i]);
if (prev != null)
{
prev.Next[i] = node.Next[i];
prev.Page.IsDirty = true;
}
if (next != null)
{
next.Prev[i] = node.Prev[i];
next.Page.IsDirty = true;
}
}
page.Nodes.Remove(node.Position.Index);
// update freebytes + items count
page.UpdateItemCount();
// if there is no more nodes in this page, delete them
if (page.Nodes.Count == 0)
{
// first, remove from free list
_pager.AddOrRemoveToFreeList(false, page, index.Page, ref index.FreeIndexPageID);
_pager.DeletePage(page.PageID, false);
}
else
{
// add or remove page from free list
_pager.AddOrRemoveToFreeList(page.FreeBytes > IndexPage.INDEX_RESERVED_BYTES, node.Page, index.Page, ref index.FreeIndexPageID);
}
page.IsDirty = true;
}
/// <summary>
/// Delete one dataBlock
/// </summary>
public DataBlock Delete(CollectionPage col, PageAddress blockAddress)
{
// get page and mark as dirty
var page = _pager.GetPage <DataPage>(blockAddress.PageID);
var block = page.DataBlocks[blockAddress.Index];
// if there a extended page, delete all
if (block.ExtendPageID != uint.MaxValue)
{
_pager.DeletePage(block.ExtendPageID, true);
}
// delete block inside page
page.DataBlocks.Remove(block.Position.Index);
// update freebytes + itemcount
page.UpdateItemCount();
// set page as dirty here
_pager.SetDirty(page);
// if there is no more datablocks, lets delete all page
if (page.DataBlocks.Count == 0)
{
// first, remove from free list
_pager.AddOrRemoveToFreeList(false, page, col, ref col.FreeDataPageID);
_pager.DeletePage(page.PageID);
}
else
{
// add or remove to free list
_pager.AddOrRemoveToFreeList(page.FreeBytes > DataPage.DATA_RESERVED_BYTES, page, col, ref col.FreeDataPageID);
}
col.DocumentCount--;
// mark collection page as dirty
_pager.SetDirty(col);
return(block);
}
/// <summary>
/// Delete one dataBlock
/// </summary>
public DataBlock Delete(CollectionPage col, PageAddress blockAddress)
{
// get page and mark as dirty
var page = _pager.GetPage<DataPage>(blockAddress.PageID);
var block = page.DataBlocks[blockAddress.Index];
// if there a extended page, delete all
if (block.ExtendPageID != uint.MaxValue)
{
_pager.DeletePage(block.ExtendPageID, true);
}
// delete block inside page
page.DataBlocks.Remove(block.Position.Index);
// update freebytes + itemcount
page.UpdateItemCount();
// set page as dirty here
_pager.SetDirty(page);
// if there is no more datablocks, lets delete all page
if (page.DataBlocks.Count == 0)
{
// first, remove from free list
_pager.AddOrRemoveToFreeList(false, page, col, ref col.FreeDataPageID);
_pager.DeletePage(page.PageID);
}
else
{
// add or remove to free list
_pager.AddOrRemoveToFreeList(page.FreeBytes > DataPage.DATA_RESERVED_BYTES, page, col, ref col.FreeDataPageID);
}
col.DocumentCount--;
// mark collection page as dirty
_pager.SetDirty(col);
return block;
}
public static string Dump(this PageAddress address)
{
return(address.PageID.Dump() + ":" + address.Index.Dump());
}
/// <summary>
/// Get a data block from a DataPage using address
/// </summary>
public DataBlock GetBlock(PageAddress blockAddress)
{
var page = _pager.GetPage <DataPage>(blockAddress.PageID);
return(page.DataBlocks[blockAddress.Index]);
}
public void Write(PageAddress value)
{
Write(value.PageID);
Write(value.Index);
}
/// <summary>
/// Read all data from datafile using a pageID as reference. If data is not in DataPage, read from ExtendPage. If readExtendData = false, do not read extended data
/// </summary>
public DataBlock Read(PageAddress blockAddress, bool readExtendData)
{
var page = _pager.GetPage<DataPage>(blockAddress.PageID);
var block = page.DataBlocks[blockAddress.Index];
// if there is a extend page, read bytes to block.Data
if (readExtendData && block.ExtendPageID != uint.MaxValue)
{
block.ExtendData = this.ReadExtendData(block.ExtendPageID);
}
return block;
}
public static void Write(this BufferSlice buffer, PageAddress value, int offset)
{
value.PageID.ToBytes(buffer.Array, buffer.Offset + offset);
buffer[offset + 4] = value.Index;
}
public static void Write(this BinaryWriter writer, PageAddress address)
{
writer.Write(address.PageID);
writer.Write(address.Index);
}
/// <summary>
/// Get a node inside a page using PageAddress - Returns null if address IsEmpty
/// </summary>
public IndexNode GetNode(PageAddress address)
{
if (address.IsEmpty) return null;
var page = _pager.GetPage<IndexPage>(address.PageID);
return page.Nodes[address.Index];
}
/// <summary>
/// Get a data block from a DataPage using address
/// </summary>
public DataBlock GetBlock(PageAddress blockAddress)
{
var page = _pager.GetPage<DataPage>(blockAddress.PageID);
return page.DataBlocks[blockAddress.Index];
}
/// <summary>
/// Read all data from datafile using a pageID as reference. If data is not in DataPage, read from ExtendPage.
/// </summary>
public byte[] Read(PageAddress blockAddress)
{
var block = this.GetBlock(blockAddress);
// if there is a extend page, read bytes all bytes from extended pages
if (block.ExtendPageID != uint.MaxValue)
{
return this.ReadExtendData(block.ExtendPageID);
}
return block.Data;
}
public void Write(PageAddress value)
{
this.Write(value.PageID);
this.Write(value.Index);
}
public void Write(PageAddress value)
{
this.Write(value.PageID);
this.Write(value.Index);
}
/// <summary>
/// Delete indexNode from a Index ajust Next/Prev nodes
/// </summary>
public void Delete(CollectionIndex index, PageAddress nodeAddress)
{
var node = this.GetNode(nodeAddress);
var page = node.Page;
// mark page as dirty here because, if deleted, page type will change
_pager.SetDirty(page);
for (int i = node.Prev.Length - 1; i >= 0; i--)
{
// get previus and next nodes (between my deleted node)
var prev = this.GetNode(node.Prev[i]);
var next = this.GetNode(node.Next[i]);
if (prev != null)
{
prev.Next[i] = node.Next[i];
_pager.SetDirty(prev.Page);
}
if (next != null)
{
next.Prev[i] = node.Prev[i];
_pager.SetDirty(next.Page);
}
}
page.Nodes.Remove(node.Position.Index);
// update freebytes + items count
page.UpdateItemCount();
// if there is no more nodes in this page, delete them
if (page.Nodes.Count == 0)
{
// first, remove from free list
_pager.AddOrRemoveToFreeList(false, page, index.Page, ref index.FreeIndexPageID);
_pager.DeletePage(page.PageID);
}
else
{
// add or remove page from free list
_pager.AddOrRemoveToFreeList(page.FreeBytes > IndexPage.INDEX_RESERVED_BYTES, node.Page, index.Page, ref index.FreeIndexPageID);
}
// now remove node from nodelist
var prevNode = this.GetNode(node.PrevNode);
var nextNode = this.GetNode(node.NextNode);
if (prevNode != null)
{
prevNode.NextNode = node.NextNode;
_pager.SetDirty(prevNode.Page);
}
if (nextNode != null)
{
nextNode.PrevNode = node.PrevNode;
_pager.SetDirty(nextNode.Page);
}
}
public static void Write(this BinaryWriter writer, PageAddress address)
{
writer.Write(address.PageID);
writer.Write(address.Index);
}
