public static IConfiguredDataSource GetToTargetDataSourceOrNullForTargetType(this IObjectMappingData mappingData)
{
var toTargetDataSources = mappingData
.MapperData
.MapperContext
.UserConfigurations
.GetDataSourcesForToTarget(mappingData.MapperData);
if (toTargetDataSources.None())
{
return(null);
}
foreach (var dataSource in toTargetDataSources)
{
mappingData = mappingData.WithSource(dataSource.SourceMember);
if (mappingData.IsTargetConstructable())
{
return(dataSource);
}
}
// TODO: Cover: Unconstructable ToTarget data source
return(null);
}
protected override bool TargetCannotBeMapped(IObjectMappingData mappingData, out Expression nullMappingBlock)
{
if (mappingData.MapperData.TargetCouldBePopulated())
{
// If a target complex type is readonly or unconstructable
// we still try to map to it using an existing non-null value:
return(base.TargetCannotBeMapped(mappingData, out nullMappingBlock));
}
if (mappingData.IsTargetConstructable())
{
return(base.TargetCannotBeMapped(mappingData, out nullMappingBlock));
}
var targetType = mappingData.MapperData.TargetType;
if (targetType.IsAbstract() && DerivedTypesExistForTarget(mappingData))
{
return(base.TargetCannotBeMapped(mappingData, out nullMappingBlock));
}
nullMappingBlock = Expression.Block(
ReadableExpression.Comment("Cannot construct an instance of " + targetType.GetFriendlyName()),
targetType.ToDefaultExpression());
return(true);
}
protected override bool TargetCannotBeMapped(IObjectMappingData mappingData, out string reason)
{
if (mappingData.MapperData.TargetCouldBePopulated())
{
// If a target complex type is readonly or unconstructable
// we still try to map to it using an existing non-null value:
return(base.TargetCannotBeMapped(mappingData, out reason));
}
if (mappingData.IsTargetConstructable())
{
return(base.TargetCannotBeMapped(mappingData, out reason));
}
var targetType = mappingData.MapperData.TargetType;
if (targetType.IsAbstract() && DerivedTypesExistForTarget(mappingData.MapperData))
{
return(base.TargetCannotBeMapped(mappingData, out reason));
}
reason = "Cannot construct an instance of " + targetType.GetFriendlyName();
return(true);
}