private Expression GetReadOnlyMemberPopulation()
{
var targetMemberAccess = MapperData.GetTargetMemberAccess();
var targetMemberNotNull = targetMemberAccess.GetIsNotDefaultComparison();
return(Expression.IfThen(targetMemberNotNull, _dataSources.BuildValue()));
}
public Expression GetFinalValueOrNull()
{
var finalDataSource = _dataSources.Last();
var finalValue = finalDataSource.Value;
if (!finalDataSource.IsFallback)
{
return(finalValue);
}
if (finalValue.NodeType == ExpressionType.Coalesce)
{
// Coalesce between the existing target member value and the fallback:
return(((BinaryExpression)finalValue).Right);
}
var targetMemberAccess = MapperData.GetTargetMemberAccess();
if (ExpressionEvaluation.AreEqual(finalValue, targetMemberAccess))
{
return(null);
}
return(finalValue);
}
private Expression GetFallbackValueOrNull()
{
var finalDataSource = _dataSources.Last();
var fallbackValue = finalDataSource.Value;
if (finalDataSource.IsConditional || _dataSources.HasOne())
{
return(fallbackValue);
}
if (fallbackValue.NodeType == ExpressionType.Coalesce)
{
return(((BinaryExpression)fallbackValue).Right);
}
var targetMemberAccess = MapperData.GetTargetMemberAccess();
if (ExpressionEvaluation.AreEqual(fallbackValue, targetMemberAccess))
{
return(null);
}
return(fallbackValue);
}
