public static ICollection <DeltaOperation> Merge(
IEnumerable <DeltaOperation> lastRevision,
IEnumerable <DeltaOperation> priorRevision)
{
var result = new LinkedList <DeltaOperation>();
using (var merger = new DeltaSimulator(lastRevision))
{
foreach (DeltaOperation operation in priorRevision)
{
switch (operation.Command)
{
case DeltaCommand.WriteLog:
result.AddLast(operation);
break;
case DeltaCommand.WriteSuccessor:
merger.Seek(operation.Offset);
merger.Read(operation.Length,
delegate(byte[] data, int offset, int count)
{
result.AddLast(DeltaOperation.WriteLog(data, offset, count));
return(count);
},
delegate(int offset, int count)
{
result.AddLast(DeltaOperation.WriteSuccessor(offset, count));
return(count);
});
break;
}
}
}
return(result);
}
public static DeltaOperation WriteLog(byte[] data, int offset, int length)
{
var result = new DeltaOperation();
result.command = DeltaCommand.WriteLog;
result.length = length;
result.data = new ArraySegment<byte>(data, offset, length);
return result;
}
public static DeltaOperation WriteSuccessor(int offset, int length)
{
var result = new DeltaOperation();
result.command = DeltaCommand.WriteSuccessor;
result.offset = offset;
result.length = length;
return result;
}
public static DeltaOperation WriteSuccessor(int offset, int length)
{
var result = new DeltaOperation();
result.command = DeltaCommand.WriteSuccessor;
result.offset = offset;
result.length = length;
return(result);
}
public static DeltaOperation WriteLog(byte[] data, int offset, int length)
{
var result = new DeltaOperation();
result.command = DeltaCommand.WriteLog;
result.length = length;
result.data = new ArraySegment <byte>(data, offset, length);
return(result);
}
public override void Read(BufferReader reader, RecordHeader header)
{
base.Read(reader, header);
for (; ; )
{
DeltaOperation operation = new DeltaOperation();
operation.Read(reader);
if (operation.Command == DeltaCommand.Stop) break;
operations.AddLast(operation);
}
}
public override void Read(BufferReader reader, RecordHeader header)
{
base.Read(reader, header);
for (; ;)
{
DeltaOperation operation = new DeltaOperation();
operation.Read(reader);
if (operation.Command == DeltaCommand.Stop)
{
break;
}
operations.AddLast(operation);
}
}