/// <summary>
/// Validate the constraint expression.
/// </summary>
/// <param name="bundle">Model to validate.</param>
/// <param name="theContext">Validation context to capture the errors.</param>
/// <returns>
/// Return true if the constraint is valid, return false if
/// the constraint is not valid.
/// </returns>
public override bool Validate(BundleModel bundle, ModelValidationContext theContext)
{
if (Expression.Node == null)
{
return(false);
}
var variableCaptureVisitor = new ConstraintVariableReferenceCaptureVisitor();
Expression.Node.AcceptVisitor(variableCaptureVisitor);
var variableReferences = variableCaptureVisitor.GetReferences();
foreach (var singletonVariableReference in variableReferences.SingletonVariableReferences)
{
if (bundle.Variables.FirstOrDefault(_ => _.Name.IsEqualTo(singletonVariableReference.VariableName)) == null)
{
theContext.AddError($"Missing singleton variable {singletonVariableReference.VariableName}");
return(false);
}
}
foreach (var aggregateVariableReference in variableReferences.AggregateVariableReferences)
{
if (bundle.Aggregates.FirstOrDefault(_ => _.Name.IsEqualTo(aggregateVariableReference.VariableName)) == null)
{
theContext.AddError($"Missing aggregate variable {aggregateVariableReference.VariableName}");
return(false);
}
}
return(true);
}
