/// <summary>
/// Constructor that will maintain an objects property in zmemory
/// </summary>
/// <param name="manager"></param>
/// <param name="propAddress"></param>
/// <param name="header"></param>
public ZProperty(IMemoryManager manager, ushort propAddress, ZHeader header)
{
_manager = manager;
_header = header;
PropertyAddress = propAddress;
var ptr = propAddress;
var propByte = _manager.Get(PropertyAddress);
if (_header.Version > 3 && (byte)(propByte & Bits.Bit7) == Bits.Bit7)
{
Number = GetPropertyNumber(propByte);
Length = (ushort)(_manager.Get(++ptr) & 0x3F);
if (Length == 0)
{
Length = 64;
}
}
else
{
Number = GetPropertyNumber(propByte);
Length = GetPropertySize(propByte);
}
DataAddress = (ushort)(PropertyAddress + 1);
_data = _manager.AsSpan(DataAddress, 2);
BytesUsed = (ushort)(Length + 1);
}
public List <ushort> GetOperands(byte opcode)
{
var args = new List <ushort>();
if (Bits.BitsSet(opcode, (byte)OperationForm.Variable))
{
// Section 4.4.3
var types = _memoryManager.Get(_stack.GetPCAndInc());
byte types2 = 0;
if (opcode == 0xec || opcode == 0xfa)
{
types2 = _memoryManager.Get(_stack.GetPCAndInc());
}
GetVariableOperands(types, args);
if (opcode == 0xec || opcode == 0xfa)
{
GetVariableOperands(types2, args);
}
}
else if (Bits.BitsSet(opcode, (byte)OperationForm.Short))
{
// Section 4.4.1
args.Add(GetOperand(ShortFormOperandType(opcode)));
}
else // Long Form
{
// Section 4.4.2
args.Add(GetOperand(LongFormOperandType1(opcode)));
args.Add(GetOperand(LongFormOperandType2(opcode)));
}
return(args);
}
/// <summary>
/// Fetches value by its reference.
/// </summary>
/// <param name="reference">Reference to the value</param>
/// <returns>The instance of value</returns>
public TValue Fetch(DbItemReference reference)
{
var item = _memoryManager.Get(reference);
if (IsVersioningEnabled)
{
var record = new VersionedRecord(item.RawData, _memoryManager, SnapshotData);
if (record.HasVisibleVersionTo(DataTankerTransaction.Current.Id))
{
item = record.GetMatchingVersion(DataTankerTransaction.Current.Id);
}
}
return(_valueSerializer.Deserialize(item.RawData));
}
public DbItem GetMatchingVersion(int transactionNumber)
{
return(_versions
.Where(version => IsVersionVisibleTo(version, transactionNumber))
.Select(version => _memoryManager.Get(version.VersionReference))
.FirstOrDefault());
}
