/// <summary>
/// Given a text expression and runtimeArgs, evaluate the expression.
/// Expressions must be compatible with DataColumn.Expression. the result is cast to T
/// </summary>
internal static object EvaluateExpressionImpl(WfExpression wfExpression, IRunState context, IDictionary <string, Resource> knownEntities)
{
var expression = context.Metadata.CompiledExpressionCache[wfExpression.Id];
if (expression == null)
{
return(GetKnownEntities(wfExpression, knownEntities));
}
else
{
// Evaluate the expression
var eSettings = new EvaluationSettings();
eSettings.TimeZoneName = TimeZoneHelper.SydneyTimeZoneName; // TODO: Workflow engine to provide a timezone to run in. Required for date-time functions.
eSettings.ParameterResolver = paramName => context.ResolveParameterValue(paramName, knownEntities); // used for runtime parameters
object result = Factory.ExpressionRunner.Run(expression, eSettings).Value;
return(CoerceToListIfNeeded(wfExpression, result));
}
}
