Inheritance

Inheritance in Piriti

Inheritance

Inheritance of POJOs is supported out of the box. Suppose you have the following class hirarchy:

abstract class Animal
{
    String name;
    int legs;
    double intelligence;
}

abstract class Mammal extends Animal
{
    Gender gender;
}

public class Cat extends Mammal
{
    public interface CatJsonReader extends JsonReader<Cat> {}
    public static final CatJsonReader JSON = GWT.create(CatJsonReader.class);
    
    String color;
}

and the following JSON data

{ "name": "Snowball", "legs": 4, "intelligence": 0.4, "gender": "female", "color": "dark grey" }

You can read Snowball using

String json = ...;
Cat snowball = Cat.JSON.read(json);

!MapUpTo

When (de)serializing POJOs Piriti automatically walks up the class hirarchy (upto but not including java.lang.Object). You can change that by using the @!MapUpTo annotation:

@MapUpTo(Mammal.class)
public class Cat extends Mammal
{
    public interface CatJsonReader extends JsonReader<Cat> {}
    public static final CatJsonReader JSON = GWT.create(CatJsonReader.class);
    
    String color;
}

In this setup the fields

• name
• legs and
• intelligence won't be processed.