A year or so I read an article that explained how I could create an annotation that basically is a container for other annotations. This way if I always use the same 5 annotations in a specific use-case I create an annotation that contains them and use that instead.
Unfortunately, I can't find the article anymore and would really like to do that right now for my jackson configuration.
Since I can't find any information on that on my own I'm beginning to question my memory. Is this possible or I am just wrong?
EDIT
What i want is something like:
@Target(ElementType.METHOD)
@com.fasterxml.jackson.databind.annotation.JsonSerialize(using=MySerializerThatIsUsedEverywhere.class
@javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter(MyCustomXmlAdapter.class)
@SomeOtherEvaluatedByTheSerializer
public @interface SerializerUseCase01 {
public String a();
public int b();
)
my scenario is that i have a bunch of serialization use cases that can be handled by the same serializer with different configs. To make everything easier to use and more transparent i want to wrap the jackson config and the serializer config into one annotation.
The @JsonProperty annotation is used to map property names with JSON keys during serialization and deserialization. By default, if you try to serialize a POJO, the generated JSON will have keys mapped to the fields of the POJO.
Jackson Annotations - @JacksonInject @JacksonInject is used when a property value is to be injected instead of being parsed from Json input. In the example below, we are inserting a value into object instead of parsing from the Json.
An annotation that has more than one method, is called Multi-Value annotation. For example: @interface MyAnnotation{ int value1();
For Jackson, this can be done with @JacksonAnnotationsInside
meta-annotation. See this article for more, but code snippet from there is:
@Retention(RetentionPolicy.RUNTIME) // IMPORTANT @JacksonAnnotationsInside @JsonInclude(Include.NON_NULL) @JsonPropertyOrder({ "id", "name" }) public @interface MyStdAnnotations
and from thereon you can use this type for your own classes like so:
@MyStdAnnotations public class MyBean { public String name, id; }
There are some examples here on how to make various combinations of annotations containing other annotations. Is this what you're looking for?
Example from the source:
@Target(ElementType.METHOD) public @interface SimpleAnnotation { public String a(); public int b(); ) @Target(ElementType.METHOD) public @interface ReallyComplexAnnotation { public SimpleAnnotation[] value(); )
Used like this:
@ReallyComplexAnnotation( { @SimpleAnnotation(a="...", b=3), @SimpleAnnotation(a="...", b=4) } )
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