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

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 *

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 * 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).

 *

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

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

 *

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 */

/*

 * @test

 * @bug 8220041

 * @summary Verify variable capture works inside switch expressions which are

 *          inside variable declarations

 */

import java.util.Objects;

public class LambdaCapture {

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

        new LambdaCapture().run();

    }

    void run() {

        assertEquals("00", lambdaCapture1(0).t());

        assertEquals("12", lambdaCapture1(1).t());

        assertEquals("D", lambdaCapture1(2).t());

        assertEquals("D", lambdaCapture1(3).t());

        assertEquals("00", lambdaCapture2(0).t());

        assertEquals("12", lambdaCapture2(1).t());

        assertEquals("D", lambdaCapture2(2).t());

        assertEquals("D", lambdaCapture2(3).t());

    }

    I<String> lambdaCapture1(int i) {

        int j = i + 1;

        I<String> r = switch (i) {

            case 0 -> () -> "0" + i; //capture parameter

            case 1 -> () -> "1" + j; //capture local variable

            default -> {

                String k = "D";

                yield () -> k; //capture local from the switch expr.

            }

        };

        return r;

    }

    I<String> lambdaCapture2(int i) {

        int j = i + 1;

        return switch (i) {

            case 0 -> () -> "0" + i; //capture parameter

            case 1 -> () -> "1" + j; //capture local variable

            default -> {

                String k = "D";

                yield () -> k; //capture local from the switch expr.

            }

        };

    }

    {

        int j1 = 1;

        I<String> r1 = switch (j1) {

            case 1 -> () -> "1" + j1; //capture local variable

            default -> {

                String k = "D";

                yield () -> k; //capture local from the switch expr.

            }

        };

        assertEquals("11", r1.t());

        int j2 = 2;

        I<String> r2 = switch (j2) {

            case 1 -> () -> "1" + j2; //capture local variable

            default -> {

                String k = "D";

                yield () -> k; //capture local from the switch expr.

            }

        };

        assertEquals("D", r2.t());

    }

    private void assertEquals(Object expected, Object actual) {

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

            throw new AssertionError("Unexpected value: " + actual);

        }

    }

    interface I<T> {

        public T t();

    }

}