Annotation Type Since


  • @Documented
    @Retention(RUNTIME)
    @Target({FIELD,TYPE})
    public @interface Since
    An annotation that indicates the version number since a member or a type has been present. This annotation is useful to manage versioning of your Json classes for a web-service.

    This annotation has no effect unless you build Gson with a GsonBuilder and invoke GsonBuilder.setVersion(double) method.

    Here is an example of how this annotation is meant to be used:

     public class User {
       private String firstName;
       private String lastName;
       @Since(1.0) private String emailAddress;
       @Since(1.0) private String password;
       @Since(1.1) private Address address;
     }
     

    If you created Gson with new Gson(), the toJson() and fromJson() methods will use all the fields for serialization and deserialization. However, if you created Gson with Gson gson = new GsonBuilder().setVersion(1.0).create() then the toJson() and fromJson() methods of Gson will exclude the address field since it's version number is set to 1.1.

    • Required Element Summary

      Required Elements 
      Modifier and Type Required Element Description
      double value
      the value indicating a version number since this member or type has been present.
    • Element Detail

      • value

        double value
        the value indicating a version number since this member or type has been present.