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using System;
using ProtoBuf.Meta;
namespace ProtoBuf.Serializers
{
internal sealed class NullDecorator : ProtoDecoratorBase
{
public override Type ExpectedType
{
get
{
return this.expectedType;
}
}
public override bool ReturnsValue
{
get
{
return true;
}
}
public override bool RequiresOldValue
{
get
{
return true;
}
}
private readonly Type expectedType;
public const int Tag = 1;
public NullDecorator(TypeModel model, IProtoSerializer tail) : base(tail)
{
bool flag = !tail.ReturnsValue;
if (flag)
{
throw new NotSupportedException("NullDecorator only supports implementations that return values");
}
Type type = tail.ExpectedType;
bool flag2 = Helpers.IsValueType(type);
if (flag2)
{
this.expectedType = model.MapType(typeof(Nullable<>)).MakeGenericType(new Type[]
{
type
});
}
else
{
this.expectedType = type;
}
}
public override object Read(object value, ProtoReader source)
{
SubItemToken token = ProtoReader.StartSubItem(source);
int num;
while ((num = source.ReadFieldHeader()) > 0)
{
bool flag = num == 1;
if (flag)
{
value = this.Tail.Read(value, source);
}
else
{
source.SkipField();
}
}
ProtoReader.EndSubItem(token, source);
return value;
}
public override void Write(object value, ProtoWriter dest)
{
SubItemToken token = ProtoWriter.StartSubItem(null, dest);
bool flag = value != null;
if (flag)
{
this.Tail.Write(value, dest);
}
ProtoWriter.EndSubItem(token, dest);
}
}
}
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