public void ProcessPayload(FormatData data)
{
if (data is FormatStartData)
{
VerifyState(FormattingState.FormatEnd, data);
ProcessFormatStart((FormatStartData)data);
_state = FormattingState.FormatStart;
}
else if (data is GroupStartData)
{
var groupData = (GroupStartData)data;
VerifyState(FormattingState.FormatStart | FormattingState.GroupEnd, data);
ProcessGroupStart(groupData);
_state = FormattingState.GroupStart;
}
else if (data is SimpleFormatEntryData)
{
// may occur in any state
ProcessFormatEntry((SimpleFormatEntryData)data);
}
else if (data is ErrorFormatEntryData)
{
// may occur in any state
ProcessFormatEntry((ErrorFormatEntryData)data);
}
else if (data is FormatEntryData)
{
VerifyState(FormattingState.GroupStart, data);
ProcessFormatEntry((FormatEntryData)data);
}
else if (data is GroupEndData)
{
VerifyState(FormattingState.GroupStart, data);
ProcessGroupEnd((GroupEndData)data);
_state = FormattingState.GroupEnd;
}
else if (data is FormatEndData)
{
VerifyState(FormattingState.GroupEnd, data);
ProcessFormatEnd((FormatEndData)data);
_state = FormattingState.GroupEnd;
}
else
{
var msg = String.Format("The format data of type {0} is unknown and cannot be processed",
data.GetType().Name);
throw new InvalidOperationException(msg);
}
}
private void VerifyState(FormattingState allowedStates, FormatData currentData)
{
if (!allowedStates.HasFlag(_state))
{
var msg = String.Format("The format data is invalid. Did you modify the output of an Format-* command?",
currentData.GetType().Name, _state);
throw new InvalidOperationException(msg);
}
}
