public OpStatus PushChange(IChangeOp op, bool bIsApplied = false)
{
DebugUtil.Log(2, "ChangeHistory.PushChange: pushed {0}", op.Identifier());
if (vHistory.Count > 0 && iCurrent < vHistory.Count)
{
TrimFuture();
}
if (bIsApplied == false)
{
OpStatus result = op.Apply();
if (result.code != OpStatus.no_error)
{
DebugUtil.Error("[ChangeHistory::PushChange] Apply() of ChangeOp {0} failed - code {1} message {2}",
op.Identifier(), result.code, result.message);
return(result);
}
}
vHistory.Add(op);
iCurrent++;
return(OpStatus.Success);
}
public OpStatus StepBack()
{
if (iCurrent == 0)
{
return(OpStatus.Success); // weird but ok
}
IChangeOp op = vHistory[iCurrent - 1];
DebugUtil.Log(2, "ChangeHistory.StepBack: reverting {0}", op.Identifier());
OpStatus result = op.Revert();
if (result.code != OpStatus.no_error)
{
DebugUtil.Error("[ChangeHistory::StepBack] Revert() of ChangeOp {0} failed - result was code {1} message {2}",
op.Identifier(), result.code, result.message);
return(result);
}
iCurrent--;
return(OpStatus.Success);
}
public OpStatus StepForward()
{
if (iCurrent == vHistory.Count)
{
return(OpStatus.Success);
}
IChangeOp op = vHistory[iCurrent];
DebugUtil.Log(2, "ChangeHistory.StepForward: applying {0}", op.Identifier());
OpStatus result = op.Apply();
if (result.code != OpStatus.no_error)
{
DebugUtil.Error("[ChangeHistory::StepForward] Apply() of ChangeOp {0} failed - result was code {1} message {2}",
op.Identifier(), result.code, result.message);
return(result);
}
iCurrent++;
return(OpStatus.Success);
}