protected void HeadPartition(Stream stream, List <ItemPartition> list)
{
try
{
var head = new ItemPartition()
{
ItemType = PersistentItemType.Head,
Position = stream.Position
};
head.Size = Math.Min(this.HeadSize, stream.Length - head.Position);
list.Add(head);
var item = new ItemPartition()
{
ItemType = PersistentItemType.Content,
Position = head.EndPosition
};
item.Size = stream.Length - item.Position;
list.Add(item);
}
catch
{
throw;
}
}
protected void TailPartition(Stream stream, List <ItemPartition> list)
{
try
{
var tail = new ItemPartition()
{
ItemType = PersistentItemType.Tail,
Position = stream.Length - this.TailSize,
Size = this.TailSize
};
list.Add(tail);
var item = new ItemPartition()
{
ItemType = PersistentItemType.Content,
Position = stream.Position
};
item.Size = stream.Length - stream.Position - tail.Size;
list.Add(item);
}
catch
{
throw;
}
}
protected void AveragePartition(Stream stream, List <ItemPartition> list)
{
try
{
long nCount = (stream.Length - stream.Position) / this.Size;
if (0 != (stream.Length - stream.Position) % this.Size)
{
nCount++;
}
for (long i = 0; i < nCount; i++)
{
var item = new ItemPartition()
{
ItemType = PersistentItemType.Content,
Position = stream.Position + i * this.Size
};
item.Size = Math.Min(this.Size, stream.Length - item.Position);
list.Add(item);
}
}
catch
{
throw;
}
}
/// <summary>
/// Determinate how to save a ItemPartition.
/// Subclass should override this method to meet its needs.
/// </summary>
/// <param name="partition"></param>
/// <returns></returns>
/// <see cref="Biu.Serialization.PersistenceDecision"/>
/// <see cref="Biu.Serialization.ItemPartition"/>
public virtual PersistenceDecision MakeSavingDecision(ItemPartition partition)
{
return(new PersistenceDecision()
{
Key = this.Keys.FirstOrDefault(),
Formatter = this.Formatters.FirstOrDefault(),
StoredType = PersistentItemStoredType.Stream,
Significance = PersistentItemSignificance.Normal
});
}
protected void HeadTailPartition(Stream stream, List <ItemPartition> list)
{
try
{
var head = new ItemPartition()
{
ItemType = PersistentItemType.Head,
Position = stream.Position
};
head.Size = Math.Min(this.HeadSize, stream.Length - head.Position);
list.Add(head);
var tail = new ItemPartition()
{
ItemType = PersistentItemType.Tail,
Position = stream.Length - this.TailSize,
Size = this.TailSize
};
long nRemainingSize = stream.Length - stream.Position - head.Size - tail.Size;
long nCount = nRemainingSize / this.Size;
if (0 != nRemainingSize % this.Size)
{
nCount++;
}
for (long i = 0; i < nCount; i++)
{
var item = new ItemPartition()
{
ItemType = PersistentItemType.Content,
Position = stream.Position + i * this.Size
};
item.Size = Math.Min(this.Size, nRemainingSize - item.Position);
list.Add(item);
}
list.Add(tail);
}
catch
{
throw;
}
}