Support for GraphQL response with custom generic classes

[antas-marcin]

The idea is to have a better way of GraphQL response serialization.

For example we have a collection in Weaviate called Pizza that has 4 properties defined:

• name
• description
• bestBefore
• price

We can define a class that will automatically the GraphQL response for Pizza collection:

@Getter
public static class Pizzas {
  @SerializedName(value = "Pizza")
  List<Pizza> pizzas;

  @Getter
  public static class Pizza extends GraphQLGetBaseObject {
    String name;
    String description;
    String bestBefore;
    Float price;
  }
}

invocation of the GraphQL query would look like this:

try (WeaviateAsyncClient asyncClient = client.async()) {
  return asyncClient.graphQL().get()
    .withClassName("Pizza")
    .withFields(Field.builder().name("name").build(), Field.builder().name("description").build())
    .run(Pizzas.class)
    .get();
}

as a response we would get GraphQLTypedResponse<Pizzas> with Pizza objects:

Result<GraphQLTypedResponse<Pizzas>> result = getResults();

List<Pizzas.Pizza> pizzas = result.getResult().getData().getObjects().getPizzas();

Pizzas.Pizza> pizza = pizzas.get(0);

// access PIzza specific properties
Float price = pizza.getPrice();

// access _additional values like vector (and others)
Float[] vector = pizza.getAdditional().getVector();
Float certainty = pizza.getAdditional().getCertainty();

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