private static Expression GetReadOnlyMemberPopulation(IMemberPopulationContext context)
{
var dataSourcesValue = context.DataSources.ValueExpression;
var targetMemberAccess = context.MapperData.GetTargetMemberAccess();
var targetMemberNotNull = targetMemberAccess.GetIsNotDefaultComparison();
return(Expression.IfThen(targetMemberNotNull, dataSourcesValue));
}
private Expression GetBinding(IMemberPopulationContext context, Expression populationGuard)
{
var bindingValue = context.DataSources.ValueExpression;
var guardedBindingValue = GetGuardedBindingValue(bindingValue, populationGuard);
var binding = context.MapperData.GetTargetMemberPopulation(guardedBindingValue);
return(binding);
}
protected override Expression GetPopulationGuard(IMemberPopulationContext context)
{
var mapperData = context.MapperData;
var populateCondition = context.PopulateCondition;
if (SkipPopulationGuarding(mapperData))
{
return populateCondition;
}
var existingValueIsDefault = mapperData.TargetMember.GetHasDefaultValueCheck(mapperData);
if (populateCondition == null)
{
return existingValueIsDefault;
}
return Expression.AndAlso(populateCondition, existingValueIsDefault);
}
public Expression GetPopulation(IMemberPopulationContext context)
{
if (!context.IsSuccessful)
{
return(context.DataSources.ValueExpression);
}
var useSingleExpression = context.MapperData.UseMemberInitialisations();
var populationGuard = GetPopulationGuard(context);
var population = useSingleExpression
? GetBinding(context, populationGuard)
: context.MapperData.TargetMember.IsReadOnly
? GetReadOnlyMemberPopulation(context)
: context.DataSources.GetPopulationExpression();
if (context.DataSources.Variables.Any())
{
population = Expression.Block(context.DataSources.Variables, population);
}
return(GetGuardedPopulation(population, populationGuard, useSingleExpression));
}
protected abstract Expression GetPopulationGuard(IMemberPopulationContext context);
protected override Expression GetPopulationGuard(IMemberPopulationContext context) => context.PopulateCondition;
