private void ParseLabel()
{
// peak the first property name
if (!reader.Read())
{
throw new VowpalWabbitJsonException(reader.Path, "Unexpected end");
}
switch (reader.TokenType)
{
case JsonToken.StartObject:
{
// parse complex object
if (!reader.Read() || reader.TokenType != JsonToken.PropertyName)
{
throw new VowpalWabbitJsonException(reader.Path, "Expected at least a single property to determine the label object");
}
var propertyName = (string)reader.Value;
var prefixReader = new PrefixedJsonReader(this.reader,
Tuple.Create(JsonToken.StartObject, (object)null),
Tuple.Create(JsonToken.PropertyName, (object)propertyName));
Type labelType;
if (!labelPropertyMapping.TryGetValue(propertyName, out labelType))
{
throw new VowpalWabbitJsonException(reader.Path, "The first property ('" + propertyName + "') must match to a property of a VowpalWabbit label type.");
}
var label = (ILabel)jsonSerializer.Deserialize(prefixReader, labelType);
this.defaultMarshaller.MarshalLabel(this.Context, label);
}
break;
case JsonToken.Integer:
case JsonToken.Float:
case JsonToken.String:
{
// pass label directly to VW
var labelString = reader.Value.ToString();
this.Context.ExampleBuilder.ParseLabel(labelString);
// prefix with label
this.Context.AppendStringExample(false, "{0}", labelString);
}
break;
case JsonToken.Null:
// ignore
break;
default:
throw new VowpalWabbitJsonException(reader.Path, "Expected label object");
}
}
private void ParseLabel()
{
// peak the first property name
if (!reader.Read())
throw new VowpalWabbitJsonException(reader.Path, "Unexpected end");
switch (reader.TokenType)
{
case JsonToken.StartObject:
{
// parse complex object
if (!reader.Read() || reader.TokenType != JsonToken.PropertyName)
throw new VowpalWabbitJsonException(reader.Path, "Expected at least a single property to determine the label object");
var propertyName = (string)reader.Value;
var prefixReader = new PrefixedJsonReader(this.reader,
Tuple.Create(JsonToken.StartObject, (object)null),
Tuple.Create(JsonToken.PropertyName, (object)propertyName));
Type labelType;
if (!labelPropertyMapping.TryGetValue(propertyName, out labelType))
throw new VowpalWabbitJsonException(reader.Path, "The first property ('" + propertyName + "') must match to a property of a VowpalWabbit label type.");
var label = (ILabel)jsonSerializer.Deserialize(prefixReader, labelType);
this.defaultMarshaller.MarshalLabel(this.Context, label);
}
break;
case JsonToken.Integer:
case JsonToken.Float:
case JsonToken.String:
{
// pass label directly to VW
var labelString = reader.Value.ToString();
this.Context.ExampleBuilder.ParseLabel(labelString);
// prefix with label
this.Context.AppendStringExample(false, "{0}", labelString);
}
break;
default:
throw new VowpalWabbitJsonException(reader.Path, "Expected label object");
}
}
