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I want to create an annotation to make Jackson ignore the annotated fields unless a certain tracing level is set:
public class A {
@IgnoreLevel("Debug") String str1;
@IgnoreLevel("Info") String str2;
}
Or, if this is easier to implement, I could also have separate annotations for the different levels:
public class A {
@Debug String str1;
@Info String str2;
}
Depending on the configuration of the ObjectMapper, either
I suppose that this should be possible with a custom AnnotationIntrospector. I have this post, but it doesn't show an example of how to implement a custom AnnotationIntrospector.
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If there are fields in Java objects that do not wish to be serialized, we can use the @JsonIgnore annotation in the Jackson library. The @JsonIgnore can be used at the field level, for ignoring fields during the serialization and deserialization.
The Jackson @JsonIgnore annotation can be used to ignore a certain property or field of a Java object. The property can be ignored both when reading JSON into Java objects and when writing Java objects into JSON.
To ignore individual properties, use the [JsonIgnore] attribute. You can specify conditional exclusion by setting the [JsonIgnore] attribute's Condition property. The JsonIgnoreCondition enum provides the following options: Always - The property is always ignored.
Use that annotation at the top of the whole class like so: @JsonIgnoreProperties({"password"}) public class Employee { private String id; private String lastName; private String firstName; private String password; ... If you need to ignore multiple properties, separate them with a comma inside the curly braces.
If you want to sub-class JacksonAnnotationIntrospector, you just need to override hasIgnoreMarker, something like:
@Override
public boolean hasIgnoreMarker(AnnotatedMember m) {
IgnoreLevel lvl = m.findAnnotation(IgnoreLevel.class);
// use whatever logic necessary
if (level.value().equals("Debug")) return true;
return super.hasIgnoreMarker();
}
but note that annotation introspection only occurs once per class so you can not dynamically change the criteria you use.
For more dynamic filtering you may want to rather use JSON Filter functionality, see for example: http://www.cowtowncoder.com/blog/archives/2011/09/entry_461.html
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