void IterateHandler(AbstractBufferedReader reader, IFieldHandler handler, bool skipping, HashSet <int> knownInlineRefs)
{
if (handler is ODBDictionaryFieldHandler)
{
var dictId = reader.ReadVUInt64();
if (!skipping)
{
var kvHandlers = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().ToArray();
IterateDict(dictId, kvHandlers[0], kvHandlers[1]);
}
}
else if (handler is DBObjectFieldHandler)
{
var oid = reader.ReadVInt64();
if (oid == 0)
{
if (!skipping)
{
_visitor?.OidReference(0);
}
}
else if (oid <= int.MinValue || oid > 0)
{
if (!skipping)
{
_visitor?.OidReference((ulong)oid);
IterateOid((ulong)oid);
}
}
else
{
if (knownInlineRefs != null)
{
if (knownInlineRefs.Contains((int)oid))
{
if (!skipping)
{
_visitor?.InlineBackRef((int)oid);
}
return;
}
if (!skipping)
{
_visitor?.InlineRef((int)oid);
}
knownInlineRefs.Add((int)oid);
}
var tableId = reader.ReadVUInt32();
var version = reader.ReadVUInt32();
if (!skipping)
{
MarkTableIdVersionFieldInfo(tableId, version);
}
string tableName;
var skip = skipping ||
_visitor != null && !_visitor.StartInlineObject(tableId,
_tableId2Name.TryGetValue(tableId, out tableName) ? tableName : null, version);
var tvi = GetTableVersionInfo(tableId, version);
for (var i = 0; i < tvi.FieldCount; i++)
{
var fi = tvi[i];
var skipField = skip || _visitor != null && !_visitor.StartField(fi.Name);
IterateHandler(reader, fi.Handler, skipField, new HashSet <int>());
if (!skipField)
{
_visitor?.EndField();
}
}
if (!skip)
{
_visitor?.EndInlineObject();
}
}
}
else if (handler is ListFieldHandler)
{
var oid = reader.ReadVInt64();
if (oid == 0)
{
if (!skipping)
{
_visitor?.OidReference(0);
}
}
else if (oid <= int.MinValue || oid > 0)
{
if (!skipping)
{
_visitor?.OidReference((ulong)oid);
IterateOid((ulong)oid);
}
}
else
{
var itemHandler = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().First();
IterateInlineList(reader, itemHandler, skipping);
}
}
else if (handler is DictionaryFieldHandler)
{
var oid = reader.ReadVInt64();
if (oid == 0)
{
if (!skipping)
{
_visitor?.OidReference(0);
}
}
else if (oid <= int.MinValue || oid > 0)
{
if (!skipping)
{
_visitor?.OidReference((ulong)oid);
IterateOid((ulong)oid);
}
}
else
{
var kvHandlers = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().ToArray();
IterateInlineDict(reader, kvHandlers[0], kvHandlers[1], skipping);
}
}
else if (handler is NullableFieldHandler)
{
var hasValue = reader.ReadBool();
if (hasValue)
{
var itemHandler = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().First();
IterateHandler(reader, itemHandler, skipping, null);
}
}
else if (handler.NeedsCtx() || handler.HandledType() == null)
{
throw new BTDBException("Don't know how to iterate " + handler.Name);
}
else
{
if (skipping || _visitor == null)
{
Action <AbstractBufferedReader> skipper;
if (!_skippers.TryGetValue(handler, out skipper))
{
var meth =
ILBuilder.Instance.NewMethod <Action <AbstractBufferedReader> >("Skip" + handler.Name);
var il = meth.Generator;
handler.Skip(il, il2 => il2.Ldarg(0));
il.Ret();
skipper = meth.Create();
_skippers.Add(handler, skipper);
}
skipper(reader);
}
else
{
Func <AbstractBufferedReader, object> loader;
if (!_loaders.TryGetValue(handler, out loader))
{
var meth =
ILBuilder.Instance.NewMethod <Func <AbstractBufferedReader, object> >("Load" + handler.Name);
var il = meth.Generator;
handler.Load(il, il2 => il2.Ldarg(0));
il.Box(handler.HandledType()).Ret();
loader = meth.Create();
_loaders.Add(handler, loader);
}
var obj = loader(reader);
if (_visitor.NeedScalarAsObject())
{
_visitor.ScalarAsObject(obj);
}
if (_visitor.NeedScalarAsText())
{
_visitor.ScalarAsText(obj == null
? "null"
: string.Format(CultureInfo.InvariantCulture, "{0}", obj));
}
}
}
}