org.aspectj/docs/release/README-1.9.3.adoc

= AspectJ 1.9.3

_© Copyright 2018 Contributors. All rights reserved._

The full list of resolved issues in 1.9.3 is available
https://bugs.eclipse.org/bugs/buglist.cgi?bug_status=RESOLVED&bug_status=VERIFIED&bug_status=CLOSED&f0=OP&f1=OP&f3=CP&f4=CP&j1=OR&list_id=16866879&product=AspectJ&query_format=advanced&target_milestone=1.9.3[here]

_Release info: 1.9.3 available 4-Apr-2019_

AspectJ 1.9.3 supports Java12. Java12 introduces the new switch
expression syntax, but you must activate support for that via an
`--enable-preview` flag when using the compiler and attempting to run the
resultant classes: Here is `Switch3.java`:

[source, java]
....
public class Switch3 {
  public static void main(String[] argv) {
    System.out.println(one(Color.R));
    System.out.println(one(Color.G));
    System.out.println(one(Color.B));
    System.out.println(one(Color.Y));
  }

  public static int one(Color color) {
    int result = switch(color) {
      case R -> foo(0);
      case G -> foo(1);
      case B -> foo(2);
      default -> foo(3);
    };
    return result;
  }

  public static final int foo(int i) {
    return i+1;
  }
}

enum Color {
  R, G, B, Y;
}

aspect X {
  int around(): call(* foo(..)) {
    return proceed()*3;
  }
}
....

Compile it with:

[source, text]
....
$ ajc --enable-preview -showWeaveInfo -12 Switch3.java

Join point 'method-call(int Switch3.foo(int))' in Type 'Switch3' (Switch3.java:12) advised by around advice from 'X' (Switch3.java:30)

Join point 'method-call(int Switch3.foo(int))' in Type 'Switch3' (Switch3.java:13) advised by around advice from 'X' (Switch3.java:30)

Join point 'method-call(int Switch3.foo(int))' in Type 'Switch3' (Switch3.java:14) advised by around advice from 'X' (Switch3.java:30)

Join point 'method-call(int Switch3.foo(int))' in Type 'Switch3' (Switch3.java:15) advised by around advice from 'X' (Switch3.java:30)
....

Now run it:

[source, text]
....
$ java --enable-preview Switch3
3
6
9
12
....