public static IDataSourceSet For(
IList <IDataSource> dataSources,
IDataSourceSetInfo info,
Func <IList <IDataSource>, IMemberMapperData, Expression> valueBuilder)
{
switch (dataSources.Count)
{
case 0:
return(EmptyDataSourceSet.Instance);
case 1:
return(For(dataSources.First(), info, (ds, md) => valueBuilder.Invoke(new[] { ds }, md)));
default:
var mapperData = info.MapperData;
if (TryAdjustToSingleUseableDataSource(ref dataSources, mapperData))
{
goto case 1;
}
if (mapperData.MapperContext.UserConfigurations.HasSourceValueFilters)
{
dataSources = dataSources.WithFilters(mapperData);
}
return(new MultipleValueDataSourceSet(dataSources, mapperData, valueBuilder));
}
}
private static IDataSourceSet For(
IDataSource dataSource,
IDataSourceSetInfo info,
Func <IDataSource, IMemberMapperData, Expression> valueBuilder)
{
if (!dataSource.IsValid)
{
return(info.MappingContext.IgnoreUnsuccessfulMemberPopulations
? EmptyDataSourceSet.Instance
: new NullDataSourceSet(dataSource));
}
var mapperData = info.MapperData;
if (mapperData.MapperContext.UserConfigurations.HasSourceValueFilters)
{
dataSource = dataSource.WithFilter(mapperData);
}
return(new SingleValueDataSourceSet(dataSource, mapperData, valueBuilder));
}
public static IDataSourceSet For(IDataSource dataSource, IDataSourceSetInfo info) => For(dataSource, info, ValueExpressionBuilders.SingleDataSource);
