net.nemerosa.resources.json.ConstructorPropertiesAnnotationIntrospector Maven / Gradle / Ivy
package net.nemerosa.resources.json;
import com.fasterxml.jackson.databind.PropertyName;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.AnnotatedConstructor;
import com.fasterxml.jackson.databind.introspect.AnnotatedParameter;
import com.fasterxml.jackson.databind.introspect.NopAnnotationIntrospector;
import java.beans.ConstructorProperties;
import java.lang.reflect.Constructor;
/**
* This introspector is plugged into a Jackson {@link com.fasterxml.jackson.databind.ObjectMapper} in order
* to setup artificially a {@link com.fasterxml.jackson.annotation.JsonCreator} on constructors generated
* by Lombok using the {@link lombok.Data} annotation.
*
* It uses the fact that Lombok adds the {@link java.beans.ConstructorProperties} annotations on the generated constructors.
*/
public class ConstructorPropertiesAnnotationIntrospector extends NopAnnotationIntrospector {
@Override
public PropertyName findNameForDeserialization(Annotated a) {
if (a instanceof AnnotatedParameter) {
AnnotatedParameter ap = (AnnotatedParameter) a;
if (ap.getOwner() instanceof AnnotatedConstructor) {
AnnotatedConstructor ac = (AnnotatedConstructor) ap.getOwner();
Constructor c = ac.getAnnotated();
ConstructorProperties properties = c.getAnnotation(ConstructorProperties.class);
if (properties != null) {
String[] names = properties.value();
int index = ap.getIndex();
if (index < names.length) {
return new PropertyName(
names[index]
);
}
}
}
}
// Default
return super.findNameForDeserialization(a);
}
}