/// <summary>
/// Restores records.
/// </summary>
/// <param name="snapshot">Snapshot to restore.</param>
public void Restore(FileCabinetRecordSnapshot snapshot)
{
var newRecords = snapshot.GetRecords();
var start = newRecords[0].Id;
var end = newRecords[newRecords.Count - 1].Id;
var index = 0;
var startInsert = 0;
while (index < this.records.Count)
{
if (this.records[index].Id >= start && this.records[index].Id <= end)
{
this.records.RemoveAt(index);
}
else
{
index++;
startInsert++;
}
}
if (this.records.Count == 0)
{
this.records.AddRange(newRecords);
}
else
{
this.records.InsertRange(startInsert, newRecords);
}
}
/// <summary>
/// Restores records.
/// </summary>
/// <param name="snapshot">Snapshot to restore.</param>
public void Restore(FileCabinetRecordSnapshot snapshot)
{
var newRecords = snapshot.GetRecords();
var start = newRecords[0].Id;
var end = newRecords[newRecords.Count - 1].Id;
var startInsert = -1;
int currentId = 0;
int currentPosition = 0;
bool readRecords = false;
using (var reader = new BinaryReader(this.stream, Encoding.Unicode, true))
{
this.stream.Seek(SizeOfShort, SeekOrigin.Begin);
if (reader.PeekChar() < 0)
{
startInsert = 0;
}
while (reader.PeekChar() > -1)
{
currentId = reader.ReadInt32();
this.stream.Seek(-SizeOfInt, SeekOrigin.Current);
if (currentId > start && startInsert == -1)
{
startInsert = currentPosition;
}
if (currentId < start)
{
startInsert = currentPosition + 1;
}
if (currentId > end)
{
readRecords = true;
break;
}
this.stream.Seek(SizeOfRecord, SeekOrigin.Current);
}
if (readRecords == true)
{
this.stream.Seek(-SizeOfShort, SeekOrigin.Current);
while (reader.PeekChar() > -1)
{
newRecords.Add(ReadRecord(reader));
}
}
}
using (var writer = new BinaryWriter(this.stream, Encoding.Unicode, true))
{
this.stream.Seek(startInsert * SizeOfRecord, SeekOrigin.Begin);
foreach (var r in newRecords)
{
this.stream.Seek(SizeOfShort, SeekOrigin.Current);
this.WriteRecordWithID(writer, r);
}
this.stream.Seek(0, SeekOrigin.Begin);
}
}
