static Action <FeatherWriter, System.Collections.IEnumerable> LookupDefaultAdapter(Type elementType, ColumnType toType)
{
var key = new AdapterKey {
FromType = elementType, ToType = toType
};
lock (UntypedEnumerableAdapters)
{
Action <FeatherWriter, System.Collections.IEnumerable> ret;
if (UntypedEnumerableAdapters.TryGetValue(key, out ret))
{
return(ret);
}
var widener = DataWidener.GetWidener(elementType);
var typedAdapter = LookupEnumerableAdapter(elementType, toType);
UntypedEnumerableAdapters[key] = ret =
(writer, data) =>
{
var widend = widener(data);
typedAdapter(writer, widend);
};
return(ret);
}
}
static Action <FeatherWriter, System.Collections.IEnumerable> LookupEnumerableAdapter(Type elementType, ColumnType toType)
{
var key = new AdapterKey {
FromType = elementType, ToType = toType
};
// making an assumption that actually using the adapter
// dominates creating it, making this lock acceptable
lock (EnumerableAdapters)
{
Action <FeatherWriter, System.Collections.IEnumerable> ret;
if (EnumerableAdapters.TryGetValue(key, out ret))
{
return(ret);
}
EnumerableAdapters[key] = ret = EnumerableAdapter.Create(elementType, toType);
return(ret);
}
}
