record-util

Some utility classes around java records

On the menu

• MapTrait

  Transform any record to a java.util.Map just by implementing the interface MapTrait

    record Person(String name, int age) implements MapTrait {}
    ...
    Map<String, Object> map = new Person("Bob", 42);

• WithTrait

  Implementing the interface WithTrait adds several methods with that allow to duplicate a record instance and update several record components in the process

  record Person(String name, int age) implements WithTrait<Person> {}
  ...
  var bob = new Person("Bob", 42);
  var ana = bob.with("name", "Ana");

• Wither

  A very fast but more cumbersome way to duplicate/update a record instance

  record Person(String name, int age) {}
  ...
  private static final Wither<Person> wither = Wither.of(MethodHandles.lookup(), Person.class);
  ...
  var bob = new Person("Bob", 42);
  var ana = wither.with(bob, "name", "Ana");

• JSONTrait

  Implementing the interface JSONTrait adds two methods toJSON and toHumanReadableJSONthat enable to output a record instance using the JSON format

  record Person(String name, int age) implements JSONTrait { }
  ...
  var person = new Person("Bob", 42);
  System.out.println(person.toHumanReadableJSON());

  JSONTrait also defines a method parse(reader, recordType) to decode a JSON file to a record instance

  var reader = ... // a FileReader or a StringReader
  var person = JSONTrait.parse(reader, Person.class);

How to build

  mvn package