/// <summary>
/// Apply a filter expression.
/// </summary>
/// <param name="filter">expression</param>
/// <param name="streamZeroEvent">the event that represents stream zero</param>
/// <param name="streamOneEvents">all events thate are stream one events</param>
/// <param name="exprEvaluatorContext">context for expression evaluation</param>
/// <returns>filtered stream one events</returns>
public static EventBean[] ApplyFilterExpression(
ExprEvaluator filter,
EventBean streamZeroEvent,
EventBean[] streamOneEvents,
ExprEvaluatorContext exprEvaluatorContext)
{
EventBean[] eventsPerStream = new EventBean[2];
eventsPerStream[0] = streamZeroEvent;
EventBean[] filtered = new EventBean[streamOneEvents.Length];
int countPass = 0;
foreach (EventBean eventBean in streamOneEvents) {
eventsPerStream[1] = eventBean;
var result = filter.Evaluate(eventsPerStream, true, exprEvaluatorContext);
if ((result != null) && true.Equals(result)) {
filtered[countPass] = eventBean;
countPass++;
}
}
if (countPass == streamOneEvents.Length) {
return streamOneEvents;
}
return EventBeanUtility.ResizeArray(filtered, countPass);
}