/// <summary>Ctor. </summary>
/// <param name="selector">is the events to select</param>
/// <param name="unit">the unit of selection</param>
/// <param name="afterTimePeriod">after-keyword time period</param>
/// <param name="afterNumberOfEvents">after-keyword number of events</param>
public OutputLimitClause(
OutputLimitSelector selector,
OutputLimitUnit unit,
TimePeriodExpression afterTimePeriod,
int?afterNumberOfEvents)
{
Selector = selector;
Unit = unit;
AfterTimePeriodExpression = afterTimePeriod;
AfterNumberOfEvents = afterNumberOfEvents;
}
/// <summary>Creates an output limit clause. </summary>
/// <param name="selector">is the events to select</param>
/// <param name="timePeriodExpression">a frequency to output at</param>
/// <returns>clause</returns>
public static OutputLimitClause Create(OutputLimitSelector selector, TimePeriodExpression timePeriodExpression)
{
return(new OutputLimitClause(selector, timePeriodExpression));
}
/// <summary>Create with after-only time period. </summary>
/// <param name="afterTimePeriodExpression">time period</param>
/// <returns>clause</returns>
public static OutputLimitClause CreateAfter(TimePeriodExpression afterTimePeriodExpression)
{
return(new OutputLimitClause(
OutputLimitSelector.DEFAULT, OutputLimitUnit.AFTER, afterTimePeriodExpression, 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);
}
}
/// <summary>Ctor. </summary>
/// <param name="afterTimePeriodExpression">timer period for after.</param>
public OutputLimitClause(TimePeriodExpression afterTimePeriodExpression)
{
Unit = OutputLimitUnit.AFTER;
AfterTimePeriodExpression = afterTimePeriodExpression;
}
/// <summary>Ctor. </summary>
/// <param name="selector">is the events to select</param>
/// <param name="timePeriodExpression">the unit for the frequency</param>
public OutputLimitClause(OutputLimitSelector selector, TimePeriodExpression timePeriodExpression)
{
Selector = selector;
TimePeriodExpression = timePeriodExpression;
Unit = OutputLimitUnit.TIME_PERIOD;
}
/// <summary>Ctor. </summary>
/// <param name="expression">interval expression</param>
/// <param name="orTerminated">indicator whether or-terminated</param>
public MatchRecognizeIntervalClause(TimePeriodExpression expression, bool orTerminated)
{
Expression = expression;
IsOrTerminated = orTerminated;
}