Automatically Apply jsonbadapaters #35
Description
In the spirits of what JPA has done with AttributeConverter(autoApply=true)
- I would suggest the following changes and implementation of the JsonbtypeAdapter:
@JsonbAnnotation
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.ANNOTATION_TYPE, ElementType.FIELD, ElementType.METHOD,ElementType.TYPE})
public @interface JsonbTypeAdapter {
//Defines if the runtime should automatically use the following adapter
//for all types as defined by the adapter implementation generic-type
//default is false
boolean autoApply() default false;
}- The adapter interface adaptation
//Where generic-type V determines the actual type for which this adapter is associated.
public interface JsonbAdapter<V, B> {
//Adapts the user property specified to a marshallable json capable type
B adaptTo(V value);
V adaptFrom(B value)
}- Then an example usages:
//In this case, the jsonb runtime should apply this adapter to all properties and types, for which the type is Normaltype.
//These adapters could technically be registered on application startup (for javaee)
@JsonTypeAdapter(autoApply=true)
public class CustomTypeAdapater implements JsonbAdapter<NormalType, Customtype> {
}
// example
public class CustomObject {
//Automatically, the json runtime will apply the CustomTypeAdapater without user explicitly specifying the values.
private NormalType2 normaltype;
}- and, from which the user has to specifically annotate the field with
@JsonTypeAdapter(autoApply=false)
public class CustomTypeAdapater2 implements JsonbAdapter<NormalType2, Customtype2> {
}
// and interface
public interface JsnobAdapted {
Class<? extends JsonbAdapter> adapter();
}
//Example usage
public class CustomObject2 {
@JsnobAdapted(CustomTypeAdapater2.class)
private NormalType2 normaltype;
}