List parsing done with LoganSquare and Realm database.

README.md

First off props to @rs411.

How to use this? If you just c&p this as @peterbetos pointed out you get a

TypeConverter classes must have a non-private zero argument constructor.

How to solve this? As I am using this for diffent types like lets say RealmList<UserEntity>. I did the following:

/**
 * Created by meier on 26.08.16.
 */
public class UserEntityRealmListConverter extends RealmListConverter {
  public UserEntityRealmListConverter() {
    super(UserEntity.class);
  }
}

I basically did this for every Type and my RealmObject's look like this:

@JsonObject @Getter public class UserEntityList extends RealmObject {
  @JsonField(name = "random") int randomValue;
  /// [...]
  @JsonField(name = "userList", typeConverter = UserEntityRealmListConverter.class) RealmList<UserEntity>
      realmUserList;
}

RealmListConverter.java

/**
 * @author Krzysztof Miemiec
 */
public class RealmListConverter<T extends RealmObject> implements TypeConverter<RealmList<T>> {

    public interface SingleFieldSerialization<T> {

        Object getValue(T object);
    }

    Class<T> clazz;
    TypeConverter<T> typeConverter;
    JsonMapper<T> mapper;
    protected SingleFieldSerialization<T> singleFieldSerialization;

    public RealmListConverter(Class<T> clazz) {
        this.clazz = clazz;
    }

    private void init() {
        if (typeConverter == null && mapper == null) {
            try {
                typeConverter = LoganSquare.typeConverterFor(clazz);
            } catch (NoSuchTypeConverterException e) {
                mapper = LoganSquare.mapperFor(clazz);
            }
        }
    }

    @Override
    public RealmList<T> parse(JsonParser jsonParser) throws IOException {
        init();
        RealmList<T> list = new RealmList<>();
        if (jsonParser.getCurrentToken() == JsonToken.START_ARRAY) {
            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                T object = typeConverter != null ? typeConverter.parse(jsonParser) : mapper.parse(jsonParser);
                if (object != null) {
                    list.add(object);
                }
            }
        }
        return list;
    }

    @Override
    public void serialize(RealmList<T> list, String fieldName, boolean writeFieldNameForObject, JsonGenerator jsonGenerator) throws IOException {
        if (writeFieldNameForObject) {
            if (list == null) {
                return;
            }
            jsonGenerator.writeFieldName(fieldName);
        }
        if (list == null) {
            jsonGenerator.writeNull();
            return;
        }
        jsonGenerator.writeStartArray();
        if (singleFieldSerialization != null) {
            JsonMapper<Object> objectMapper = LoganSquare.mapperFor(Object.class);
            for (T object : list) {
                if (object != null) {
                    objectMapper.serialize(singleFieldSerialization.getValue(object), jsonGenerator, true);
                } else {
                    jsonGenerator.writeNull();
                }
            }
        } else {
            init();
            for (T object : list) {
                if (object != null) {
                    if (typeConverter != null) {
                        typeConverter.serialize(object, fieldName, false, jsonGenerator);
                    } else {
                        mapper.serialize(object, jsonGenerator, true);
                    }
                } else {
                    jsonGenerator.writeNull();
                }
            }
        }
        jsonGenerator.writeEndArray();
    }
}