public void MarshalFeature(VowpalWabbitMarshalContext context, Namespace ns, Feature feature, CustomClass value)
{
Assert.IsNotNull(context);
Assert.IsNotNull(ns);
Assert.IsNotNull(feature);
Assert.IsNotNull(value);
Assert.AreEqual(5, value.X);
value.HasVisited = true;
}
public void Marshal(VowpalWabbitMarshalContext ctx, Namespace ns, Feature feature)
{
var jsonSerializer = new JsonSerializer();
using (var jsonBuilder = new VowpalWabbitJsonBuilder(ctx.VW, VowpalWabbitDefaultMarshaller.Instance, jsonSerializer))
{
// serialize from object to JSON
var sb = new StringBuilder();
using (var writer = new JsonTextWriter(new StringWriter(sb)))
{
this.jsonConverter.WriteJson(writer, this.value, jsonSerializer);
}
// marshal from JSON to VW
using (var reader = new JsonTextReader(new StringReader(sb.ToString())))
{
jsonBuilder.Parse(reader, ctx, new Namespace(ctx.VW, feature.Name));
}
}
}
/// <summary>
/// Expects that actual feature value.
/// </summary>
private void ParseFeature(VowpalWabbitMarshalContext context, Namespace ns, string featureName)
{
switch (reader.TokenType)
{
case JsonToken.Float:
{
var feature = new PreHashedFeature(this.vw, ns, featureName);
this.defaultMarshaller.MarshalFeature(context, ns, feature, (double)reader.Value);
}
break;
case JsonToken.Integer:
{
var feature = new PreHashedFeature(this.vw, ns, featureName);
this.defaultMarshaller.MarshalFeature(context, ns, feature, (long)reader.Value);
}
break;
case JsonToken.String:
{
var feature = new Feature(featureName);
this.defaultMarshaller.MarshalFeatureStringEscape(context, ns, feature, (string)reader.Value);
}
break;
case JsonToken.Boolean:
{
var feature = new PreHashedFeature(this.vw, ns, featureName);
this.defaultMarshaller.MarshalFeature(context, ns, feature, (bool)reader.Value);
}
break;
case JsonToken.Comment:
case JsonToken.Null:
// probably best to ignore?
break;
case JsonToken.StartArray:
this.ParseFeatureArray(context, ns);
break;
default:
throw new VowpalWabbitJsonException(reader.Path, "Unexpected token " + reader.TokenType + " while deserializing primitive feature");
}
}
