public override Element VisitWhenExpressionExp(WhenExpressionExpContext context)
{
var whenExpresion = new WhenExpression(CreateParseInfo(context));
whenExpresion.Children.Add(Visit(context.b));
whenExpresion.Children.Add(Visit(context.s));
return(whenExpresion);
}
/// <summary>
/// Creates a <see cref="CasesColumn"/>
/// </summary>
/// <param name="first"></param>
/// <param name="others"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"> if <paramref name="whenExpressions"/> is <c>null</c></exception>
public static CasesColumn Cases(WhenExpression first, params WhenExpression[] others)
{
if (first == null)
{
throw new ArgumentNullException(nameof(first));
}
if (others == null)
{
throw new ArgumentNullException(nameof(others));
}
return(new CasesColumn(new[] { first }.Union(others.Where(x => x != null))));
}
/// <summary>Renders the clause in textual representation. </summary>
/// <param name="writer">to output to</param>
public void ToEPL(TextWriter writer)
{
if (AfterTimePeriodExpression != null)
{
writer.Write("after ");
AfterTimePeriodExpression.ToEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
writer.Write(" ");
}
else if ((AfterNumberOfEvents != null) && (AfterNumberOfEvents != 0))
{
writer.Write("after ");
writer.Write(Convert.ToString(AfterNumberOfEvents));
writer.Write(" events ");
}
if (Selector != OutputLimitSelector.DEFAULT)
{
writer.Write(Selector.GetText());
writer.Write(" ");
}
if (Unit == OutputLimitUnit.WHEN_EXPRESSION)
{
writer.Write("when ");
WhenExpression.ToEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
if ((ThenAssignments != null) && (ThenAssignments.Count > 0))
{
WriteThenAssignments(writer, ThenAssignments);
}
}
else if (Unit == OutputLimitUnit.CRONTAB_EXPRESSION)
{
writer.Write("at (");
String delimiter = "";
for (int i = 0; i < CrontabAtParameters.Length; i++)
{
writer.Write(delimiter);
CrontabAtParameters[i].ToEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
delimiter = ", ";
}
writer.Write(")");
}
else if (Unit == OutputLimitUnit.TIME_PERIOD && TimePeriodExpression != null)
{
writer.Write("every ");
TimePeriodExpression.ToEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
}
else if (Unit == OutputLimitUnit.AFTER)
{
// no action required
}
else if (Unit == OutputLimitUnit.CONTEXT_PARTITION_TERM)
{
writer.Write("when terminated");
OutputAndAfter(writer);
}
else
{
writer.Write("every ");
if (FrequencyVariable == null)
{
writer.Write(Convert.ToString(Frequency.AsInt()));
}
else
{
writer.Write(FrequencyVariable);
}
writer.Write(" events");
}
if (IsAndAfterTerminate)
{
writer.Write(" and when terminated");
OutputAndAfter(writer);
}
}
public override string ToString()
{
return($"ExprCaseAlter: When->{WhenExpression.ToString()} Then->{ThenExpression.ToString()}");
}
public void Visit(WhenExpression statement)
{
}