/*

 * @test /nodymaticcopyright/

 * @bug 8206986

 * @summary Verify rule cases work properly.

 * @compile/fail/ref=SwitchStatementArrow-old.out -source 9 -Xlint:-options -XDrawDiagnostics SwitchStatementArrow.java

 */

import java.util.Objects;

import java.util.function.Function;

public class SwitchStatementArrow {

    public static void main(String... args) {

        new SwitchStatementArrow().run();

    }

    private void run() {

        runTest(this::statement1);

        runTest(this::scope);

    }

    private void runTest(Function<T, String> print) {

        check(T.A,  print, "A");

        check(T.B,  print, "B-C");

        check(T.C,  print, "B-C");

        try {

            print.apply(T.D);

            throw new AssertionError();

        } catch (IllegalStateException ex) {

            if (!Objects.equals("D", ex.getMessage()))

                throw new AssertionError(ex);

        }

        check(T.E,  print, "other");

    }

    private String statement1(T t) {

        String res;

        switch (t) {

            case A -> { res = "A"; }

            case B, C -> res = "B-C";

            case D -> throw new IllegalStateException("D");

            default -> { res = "other"; break; }

        }

        return res;

    }

    private String scope(T t) {

        String res;

        switch (t) {

            case A -> { String r = "A"; res = r; }

            case B, C -> {String r = "B-C"; res = r; }

            case D -> throw new IllegalStateException("D");

            default -> { String r = "other"; res = r; break; }

        }

        return res;

    }

    private int r;

    private void check(T t, Function<T, String> print, String expected) {

        String result = print.apply(t);

        if (!Objects.equals(result, expected)) {

            throw new AssertionError("Unexpected result: " + result);

        }

    }

    enum T {

        A, B, C, D, E;

    }

}