Using Jackson JSON Views without annotating original bean class - json

Question

Is there any way that I can use Jackson JSON Views or something like it, without having to annotate the original bean class? I'm looking for some kind of runtime/dynamic configuration to let me do something similar.
My bean is an #Entity packaged in a JAR that may be shared by multiple projects. I'm trying to avoid touching and re-packaging the shared JAR because of UI changes in the consuming projects.
Ideally I'd like to do something like
jsonViewBuilder = createViewBuilder(View.class);
jsonViewBuilder.addProperty("property1");
jsonViewBuilder.addProperty("property2");
to replace
Bean {
#JsonView(View.class)
String property1;
#JsonView(View.class)
String property2;
}
Any ideas?
Underlying environment: Spring 3.0, Spring MVC and Glassfish 3.1.1.

Answer 1

How about using the Mix-In feature?
http://wiki.fasterxml.com/JacksonMixInAnnotations
http://www.cowtowncoder.com/blog/archives/2009/08/entry_305.html
import org.codehaus.jackson.annotate.JsonAutoDetect.Visibility;
import org.codehaus.jackson.annotate.JsonMethod;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonView;
public class JacksonFoo
{
public static void main(String[] args) throws Exception
{
ObjectMapper mapper = new ObjectMapper().setVisibility(JsonMethod.FIELD, Visibility.ANY)
.configure(SerializationConfig.Feature.DEFAULT_VIEW_INCLUSION, false);
mapper.getSerializationConfig().addMixInAnnotations(Bar.class, BarMixIn.class);
mapper.setSerializationConfig(mapper.getSerializationConfig().withView(Expose.class));
System.out.println(mapper.writeValueAsString(new Bar()));
// output: {"b":"B"}
}
}
class Bar
{
String a = "A";
String b = "B";
}
abstract class BarMixIn
{
#JsonView(Expose.class)
String b;
}
// Used only as JsonView marker.
// Could use any existing class, like Object, instead.
class Expose {}