Java Type Generic as Argument for GSON

Question

In GSON to get a list of objects you do

Gson gson = new Gson();
Type token = new TypeToken>(){}.getType();
return gson.fromJson(json         


        

Answer 1

This work for everything. e.g. map which has a key and value generic.

CustomType type = new CustomType(Map.class, String.class, Integer.class);

So no more TokenType.

class CustomType implements ParameterizedType {
    private final Class container;
    private final Class[] wrapped;

    @Contract(pure = true)
    public CustomType(Class container, Class... wrapped) {
        this.container = container;
        this.wrapped = wrapped;
    }

    @Override
    public Type[] getActualTypeArguments() {
        return this.wrapped;
    }

    @Override
    public Type getRawType() {
        return this.container;
    }

    @Override
    public Type getOwnerType() {
        return null;
    }
}