deserialize an object using a facade pattern

[ellsworthrw]

Ran into a wall trying to write a converter for a class using a facade pattern. Here are my classes:
@JsonObject
class Ribbon {
@JsonField
List tiles
}

class TileAsset {
private Metadata metadata
public TileAsset(Metadata metadata) {
mMetadata = metadata;
}
}

@JsonObject
class Metadata {
}

I am trying to write a type converter but have not found a way to implement it. This is an attempt:

public static class TileAssetConverter implements TypeConverter {
@OverRide
public TileAsset parse(JsonParser jsonParser) throws IOException {
Mlog.d(TAG, "parse(%s)", jsonParser.getInputSource());
if (jsonParser.getInputSource() instanceof InputStream) {
// PROBLEM: jsonParser.getInputSource() is always null: need a way to get the input stream
// Next problem: is that jackson's parser needs to advance past this object when done
Metadata metadata = LoganSquare.parse((InputStream) jsonParser.getInputSource(), Metadata.class);
return new TileAsset(metadata);
}
return null;
}

    @Override
    public void serialize(TileAsset object, String fieldName, boolean writeFieldNameForObject, JsonGenerator jsonGenerator) throws IOException {
        if (fieldName != null) {
            jsonGenerator.writeStringField(fieldName, Utils.toJSON(object.mMetadata));
        } else {
            jsonGenerator.writeString(Utils.toJSON(object.mMetadata));
        }
    }
}

[ellsworthrw]

The following works but it is a hack and is brittle:

public static class TileAssetConverter implements TypeConverter<TileAsset> {
    @Override
    public TileAsset parse(JsonParser jsonParser) throws IOException {
        Metadata metadata = JsonMapperLoaderImpl.COM_MOVENETWORKS_MODEL_METADATA__JSONOBJECTMAPPER.parse(jsonParser);
        return new TileAsset(metadata);
    }

}

There has to be a more safe way of doing this.