// Protected //
protected Tuple <CellAffinity, int> SizeTypeOf(List <Expression> Xs)
{
int MaxSize = -1;
CellAffinity MaxAffinity = CellAffinity.BOOL;
foreach (Expression x in Xs)
{
CellAffinity ca = x.TypeOf();
MaxAffinity = CellAffinityHelper.Highest(MaxAffinity, ca);
if (MaxAffinity == ca)
{
MaxSize = Math.Max(MaxSize, x.SizeOf());
}
}
return(new Tuple <CellAffinity, int>(MaxAffinity, MaxSize));
}
/// <summary>
///
/// </summary>
/// <param name="Names"></param>
/// <param name="Types"></param>
/// <returns></returns>
public static Schema FromString(string Names, string Types)
{
string[] NameArray = Names.Split(',');
string[] TypeArray = Types.Split(',');
if (NameArray.Length != TypeArray.Length)
{
throw new ArgumentException("The name and type tags have different counts");
}
Schema columns = new Schema();
for (int i = 0; i < NameArray.Length; i++)
{
string[] x = TypeArray[i].Split('.');
CellAffinity t = CellAffinityHelper.Parse(x[0]);
int size = 8;
if (t == CellAffinity.CSTRING && x.Length == 2)
{
size = int.Parse(x[1]);
}
else if (t == CellAffinity.CSTRING)
{
size = Schema.DEFAULT_STRING_SIZE;
}
else if (t == CellAffinity.BINARY && x.Length == 2)
{
size = int.Parse(x[1]);
}
else if (t == CellAffinity.BINARY)
{
size = Schema.DEFAULT_BLOB_SIZE;
}
columns.Add(NameArray[i], t, size);
}
return(columns);
}
// Adds //
/// <summary>
/// Adds a column to the schema; will throw an exception if a column name passed already exists in the schema
/// </summary>
/// <param name="Alias">The column name</param>
/// <param name="Affinity">The column affinity</param>
/// <param name="Nullable">A boolean, true means the column can be nulls, false means the column cannot be null</param>
/// <param name="PageSize">The size in bytes; this will be ignored if the affinity is not variable (not string or blob)</param>
public void Add(string Name, CellAffinity Affinity, int Size, bool Nullable)
{
// Check the name size //
if (Name.Length > MAX_COLUMN_NAME_LEN)
{
Name = Name.Substring(0, MAX_COLUMN_NAME_LEN);
}
// Check the size //
if (CellAffinityHelper.IsVariableLength(Affinity) && Size == 0)
{
throw new Exception("Variable length types must have a size greater than zero");
}
// Check if exists //
if (this.Contains(Name))
{
throw new Exception("Column already exists: " + Name);
}
// Check for capacity //
if (this.Count >= MAX_COLUMNS)
{
throw new Exception("Schema cannot accept any more columns");
}
// Get the size //
int v = CellSerializer.FixLength(Affinity, Size);
// Build record //
Record r = Record.Stitch(new Cell(Name), new Cell((byte)Affinity), new Cell(Nullable), new Cell(v));
// Accumulate record //
this._Cache.Allocate(Name, r);
// Hash code //
this._HashCode += r.GetHashCode(new Key(1, 2)) * this.Count;
}
