field default values

[danielnorberg]

@AutoMatter
interface Foobar {

  String baz();

  @AutoMatter.Field
  default String foo() {
    return "foo";
  }

  @AutoMatter.Field
  default String bar() {
    // Default valued fields can refer to other fields
    // Note: The fields referred to must be _above_ the referring field.
    return foo() + " bar " + baz();
  }
}

// ...

Foobar foobarWithFooDefault = new FoobarBuilder()
    .baz("baz")
    .build();

// prints: Foobar{baz=baz, foo=foo, bar=foo bar baz}
out.println("default values only: " + foobarWithFooDefault);

Foobar foobarWithFooValue = new FoobarBuilder()
    .baz("baz")
    .foo("hello")
    .build();

// prints: Foobar{baz=baz, foo=hello, bar=hello bar baz}
out.println("with foo value: " + foobarWithFooValue);

[danielnorberg]

TODO:

• Allow Optional fields?
• Allow collection/map fields?
• Add @AutoMatter.Default annotation instead of using @AutoMatter.Field?

[danielnorberg]

Note: does not work well with gson as it bypasses the value constructor.

[DLisk]

@danielnorberg Are there plans to merge this into master sometime soon?