/// <summary>
/// Loads the header.
/// </summary>
public void LoadHeader(BinaryStreamBase stream)
{
stream.Position = 0;
byte version = stream.ReadUInt8();
if (version == 109)
{
stream.Position = 0;
if (EncodingDefinition.FixedSizeCombinedEncoding != new EncodingDefinition(stream.ReadGuid()))
throw new Exception("Header Corrupt");
if (TreeNodeType != new EncodingDefinition(stream.ReadGuid()))
throw new Exception("Header Corrupt");
if (BlockSize != stream.ReadInt32())
throw new Exception("Header Corrupt");
if (stream.ReadUInt8() != 0)
throw new Exception("Header Corrupt");
LastAllocatedBlock = stream.ReadUInt32();
RootNodeIndexAddress = stream.ReadUInt32();
RootNodeLevel = stream.ReadUInt8();
}
else if (version == 1)
{
if (BlockSize != stream.ReadInt32())
throw new Exception("Header Corrupt");
if (TreeNodeType != new EncodingDefinition(stream))
throw new Exception("Header Corrupt");
LastAllocatedBlock = stream.ReadUInt32();
RootNodeIndexAddress = stream.ReadUInt32();
RootNodeLevel = stream.ReadUInt8();
}
else
{
throw new VersionNotFoundException();
}
}
/// <summary>
/// Creates a new <see cref="SortedTreeEngineReaderOptions"/> from a stream
/// </summary>
/// <param name="stream">the stream to read from</param>
public SortedTreeEngineReaderOptions(BinaryStreamBase stream)
{
byte version = stream.ReadUInt8();
switch (version)
{
case 0:
Timeout = new TimeSpan(stream.ReadInt64());
MaxReturnedCount = stream.ReadInt64();
MaxScanCount = stream.ReadInt64();
MaxSeekCount = stream.ReadInt64();
break;
default:
throw new VersionNotFoundException("Unknown Version");
}
}
/// <summary>
/// Reads the header data.
/// </summary>
/// <param name="stream"></param>
/// <param name="treeNodeType"></param>
/// <param name="blockSize"></param>
internal static void ReadHeader(BinaryStreamBase stream, out EncodingDefinition treeNodeType, out int blockSize)
{
stream.Position = 0;
byte version = stream.ReadUInt8();
if (version == 109)
{
stream.Position = 0;
stream.ReadGuid();
treeNodeType = new EncodingDefinition(stream.ReadGuid());
blockSize = stream.ReadInt32();
}
else if (version == 1)
{
blockSize = stream.ReadInt32();
treeNodeType = new EncodingDefinition(stream);
}
else
{
throw new VersionNotFoundException();
}
}
/// <summary>
/// Loads a <see cref="DatabaseInfo"/> from stream.
/// </summary>
/// <param name="stream"></param>
public DatabaseInfo(BinaryStreamBase stream)
{
byte version = stream.ReadUInt8();
switch (version)
{
case 1:
DatabaseName = stream.ReadString();
KeyTypeID = stream.ReadGuid();
ValueTypeID = stream.ReadGuid();
var count = stream.ReadInt32();
EncodingDefinition[] definitions = new EncodingDefinition[count];
for (int x = 0; x < count; x++)
{
definitions[x] = new EncodingDefinition(stream);
}
SupportedStreamingModes = new ReadOnlyCollection<EncodingDefinition>(definitions);
KeyType = Library.GetSortedTreeType(KeyTypeID);
ValueType = Library.GetSortedTreeType(ValueTypeID);
break;
default:
throw new VersionNotFoundException("Unknown version code.");
}
}
/// <summary> /// Writes the provided data to the BinaryWriter /// </summary> /// <param name="stream"></param> public abstract void Write(BinaryStreamBase stream);
/// <summary> /// Reads the provided key from the stream. /// </summary> /// <param name="stream"></param> public abstract void Read(BinaryStreamBase stream);
public void Save(BinaryStreamBase stream)
{
stream.Write((byte)1);
stream.Write(DatabaseName);
stream.Write(KeyTypeID);
stream.Write(ValueTypeID);
stream.Write(SupportedStreamingModes.Count);
foreach (var encoding in SupportedStreamingModes)
{
encoding.Save(stream);
}
}
/// <summary>
/// Creates a <see cref="Stream"/> wrapper around a <see cref="BinaryStreamBase"/>.
/// </summary>
/// <param name="baseStream"></param>
internal BinaryStreamStream(BinaryStreamBase baseStream)
{
BaseStream = baseStream;
}
/// <summary>
/// Writes this data to the <see cref="stream"/>.
/// </summary>
/// <param name="stream">the stream to write data to</param>
public void Save(BinaryStreamBase stream)
{
stream.Write((byte)0);
stream.Write(Timeout.Ticks);
stream.Write(MaxReturnedCount);
stream.Write(MaxScanCount);
stream.Write(MaxSeekCount);
}
/// <summary>
/// Creates a <see cref="Stream"/> wrapper around a <see cref="BinaryStreamBase"/>.
/// </summary>
/// <param name="baseStream"></param>
internal BinaryStreamStream(BinaryStreamBase baseStream)
{
BaseStream = baseStream;
}
/// <summary>
/// Writes the first page of the SortedTree as long as the <see cref="IsDirty"/> flag is set.
/// After returning, the IsDirty flag is cleared.
/// </summary>
public void SaveHeader(BinaryStreamBase stream)
{
if (!IsDirty)
return;
long oldPosotion = stream.Position;
stream.Position = 0;
stream.Write((byte)1);
stream.Write(BlockSize);
TreeNodeType.Save(stream);
stream.Write(LastAllocatedBlock);
stream.Write(RootNodeIndexAddress); //Root Index
stream.Write(RootNodeLevel); //Root Index
stream.Position = oldPosotion;
m_isDirty = false;
}
