/// <summary>
/// Verify that the transition from the current state into new state is valid.
/// </summary>
/// <param name="newState">The new writer state to transition into.</param>
private void ValidateTransition(ParameterWriterState newState)
{
if (this.State != ParameterWriterState.Error && newState == ParameterWriterState.Error)
{
// we can always transition into an error state if we are not already in an error state
return;
}
switch (this.State)
{
case ParameterWriterState.Start:
if (newState != ParameterWriterState.CanWriteParameter && newState != ParameterWriterState.Completed)
{
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromStart));
}
break;
case ParameterWriterState.CanWriteParameter:
if (newState != ParameterWriterState.CanWriteParameter && newState != ParameterWriterState.ActiveSubWriter && newState != ParameterWriterState.Completed)
{
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromCanWriteParameter));
}
break;
case ParameterWriterState.ActiveSubWriter:
if (newState != ParameterWriterState.CanWriteParameter)
{
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromActiveSubWriter));
}
break;
case ParameterWriterState.Completed:
// we should never see a state transition when in state 'Completed'
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromCompleted));
case ParameterWriterState.Error:
if (newState != ParameterWriterState.Error)
{
// No more state transitions once we are in error state
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromError));
}
break;
default:
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_UnreachableCodePath));
}
}
private void ValidateTransition(ParameterWriterState newState)
{
if ((this.State == ParameterWriterState.Error) || (newState != ParameterWriterState.Error))
{
switch (this.State)
{
case ParameterWriterState.Start:
if ((newState != ParameterWriterState.CanWriteParameter) && (newState != ParameterWriterState.Completed))
{
throw new ODataException(Microsoft.Data.OData.Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromStart));
}
break;
case ParameterWriterState.CanWriteParameter:
if (((newState != ParameterWriterState.CanWriteParameter) && (newState != ParameterWriterState.ActiveSubWriter)) && (newState != ParameterWriterState.Completed))
{
throw new ODataException(Microsoft.Data.OData.Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromCanWriteParameter));
}
break;
case ParameterWriterState.ActiveSubWriter:
if (newState != ParameterWriterState.CanWriteParameter)
{
throw new ODataException(Microsoft.Data.OData.Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromActiveSubWriter));
}
break;
case ParameterWriterState.Completed:
throw new ODataException(Microsoft.Data.OData.Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromCompleted));
case ParameterWriterState.Error:
if (newState != ParameterWriterState.Error)
{
throw new ODataException(Microsoft.Data.OData.Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_InvalidTransitionFromError));
}
break;
default:
throw new ODataException(Microsoft.Data.OData.Strings.General_InternalError(InternalErrorCodes.ODataParameterWriterCore_ValidateTransition_UnreachableCodePath));
}
}
}
private void EnterScope(ParameterWriterState newState)
{
this.ValidateTransition(newState);
this.scopes.Push(newState);
}
