/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8186961

 * @run main/othervm StaticFieldsOnInterface C

 * @run main/othervm StaticFieldsOnInterface D

 * @run main/othervm StaticFieldsOnInterface Y

 */

public class StaticFieldsOnInterface {

    /*

            A

           / \

          B  C

          \  /

           D

        Interface A has a public field

        Ensure B, C, D only report exactly one public field

          A

         /

        X A

        |/

        Y

        Ensure class Y, extending class X, reports exactly one public field

     */

    public interface A {

        public static final int CONSTANT = 42;

    }

    public interface B extends A {

    }

    public interface C extends A {

    }

    public interface D extends B, C {

    }

    static class X implements A {}

    static class Y extends X implements A {}

    public static void main(String[] args) throws Exception {

        char first = 'C';

        if (args.length > 0) {

            first = args[0].charAt(0);

        }

        assertOneField(A.class);

        // D first

        if (first == 'D') {

            assertOneField(D.class);

            assertOneField(C.class);

        }

        // C first

        else if (first == 'C') {

            assertOneField(C.class);

            assertOneField(D.class);

        }

        else {

            assertOneField(Y.class);

        }

    }

    static void assertOneField(Class<?> c) {

        int nfs = c.getFields().length;

        if (nfs != 1) {

            throw new AssertionError(String.format(

                    "Class %s does not have exactly one field: %d", c.getName(), nfs));

        }

    }

}