/// <summary>
/// Contruye un nuevo ConditionalChartElement.
/// </summary>
/// <param name="index">El parametro no es relevante para este metodo.</param>
/// <returns>El nuevo ConditionalChartElement.</returns>
public override ChartElement Build(int index)
{
ConditionalChartElement element = new ConditionalChartElement
{
PinSize = new Size(5, 5),
BackColor = Color.LightBlue,
Display = new Rectangle(Center.X - 100, Center.Y - 25, 200, 50),
ShowInputPins = false,
ShowOutputPins = false,
Condition = ""
};
return(element);
}
/// <summary>
/// Ejecuta un algoritmo determinado, dado por un ChartElementCollection.
/// </summary>
/// <param name="instructionCollection">El conjunto de instrucciones a ejecutar.</param>
public void ExecuteAlgorithm(ChartElementCollection instructionCollection)
{
ChartElement current = null;
try
{
ChartElement first = instructionCollection.First; // Obtiene el elemento "Begin" si existe.
if (first == null || first.Connections == null)
{
throw new Exception("Invalid algorithm to execute."); // Si no existe el "Begin", el algoritmo no es valido.
}
foreach (var connection in first.Connections)
{
if (connection.To != null)
{
current = connection.To.ChartElement; // Obtiene la primera instruccion a ejecutar.
}
}
while (!(current is EndChartElement) && !shouldStop)
{
if (current == null)
{
throw new InvalidOperationException("Unconnected chart element. Check your chart connections.");
}
if (current is ConditionalChartElement)
{
ConditionalChartElement conditionalChart = (ConditionalChartElement)current;
if (conditionalChart.Condition == "")
{
throw new InvalidOperationException("Invalid conditional chart.");
}
string preExpression = ParseSensorData(conditionalChart.Condition).ToLower();
string evaluationResult = Evaluator.Evaluate(preExpression);
bool found = false;
foreach (var connection in current.Connections)
{
if (evaluationResult.Equals(connection.Label))
{
if (connection.To != null)
{
current = connection.To.ChartElement;
found = true;
}
else
{
throw new Exception("Invalid connection");
}
break;
}
}
if (!found)
{
throw new InvalidOperationException("Invalid conditional expression.");
}
}
else
{
if (current is CommandChartElement)
{
ExecuteCommand((CommandChartElement)current);
}
else if (current is ActivityChartElement)
{
string activityName = ((ActivityChartElement)current).ActivityName;
if (ActivityList.ContainsKey(activityName))
{
ExecuteAlgorithm(ActivityList[activityName]);
}
else
{
throw new InvalidOperationException("Invalid activity.");
}
}
else if (current is AssignationChartElement)
{
AssignationChartElement assignChart = (AssignationChartElement)current;
if (assignChart.Name == "" || assignChart.Expression == "")
{
throw new InvalidOperationException("Invalid assignation chart element.");
}
string where = ParseSensorData(assignChart.Name);
string preExpression = ParseSensorData(((AssignationChartElement)current).Expression).ToLower();
string what = Evaluator.Evaluate(preExpression);
Evaluator.Assign(where, what);
}
foreach (var connection in current.Connections)
{
if (connection.To != null)
{
current = connection.To.ChartElement;
}
else
{
throw new InvalidOperationException("Unconnected chart element. Check your chart connections.");
}
break;
}
}
}
}
catch (Exception exception)
{
if (!(exception is ThreadAbortException))
{
OnError(exception); // Lanza el evento Error con el mensaje incluido.
if (current != null)
{
current.BackColor = Color.Red; // Cambia el color del chartElement actual para permitir al usuario conocer la fuente del error.
}
Thread.CurrentThread.Abort(); // Termina la ejecucion del hilo actual.
}
}
}