Annotations-only approach
Alternatively to the custom deserializer approach, you can have the following for an annotations-only solution (similar to the one described in Spunc's answer, but using type
as an external property):
public abstract class AbstractData {
private Owner owner;
private Metadata metadata;
// Getters and setters
}
public static final class FooData extends AbstractData {
private Foo object;
// Getters and setters
}
public static final class BarData extends AbstractData {
private Bar object;
// Getters and setters
}
public class Wrapper {
private String type;
@JsonTypeInfo(use = Id.NAME, property = "type", include = As.EXTERNAL_PROPERTY)
@JsonSubTypes(value = {
@JsonSubTypes.Type(value = FooData.class, name = "Foo"),
@JsonSubTypes.Type(value = BarData.class, name = "Bar")
})
private AbstractData data;
// Getters and setters
}
In this approach, @JsonTypeInfo
is set to use type
as an external property to determine the right class to map the data
property.
The JSON document can be deserialized as following:
ObjectMapper mapper = new ObjectMapper();
Wrapper wrapper = mapper.readValue(json, Wrapper.class);
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