1 /*

     2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 8025799

    27  * @summary Reflection.getCallerClass(int)

    28  * @modules java.base/jdk.internal.reflect

    29  * @run main GetCallerClassWithDepth

    30  */

    31 

    32 import jdk.internal.reflect.Reflection;

    33 

    34 public class GetCallerClassWithDepth {

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

    36         Class<?> c = Test.test();

    37         assertEquals(c, GetCallerClassWithDepth.class);

    38         Class<?> caller = Test.caller();

    39         assertEquals(caller, GetCallerClassWithDepth.class);

    40         Test.selfTest();

    41 

    42         try {

    43             Reflection.getCallerClass(-1);

    44             throw new RuntimeException("getCallerClass(-1) should fail");

    45         } catch (Error e) {

    46             System.out.println("Expected: " + e.getMessage());

    47         }

    48     }

    49 

    50     public Class<?> getCallerClass() {

    51         // 0: Reflection 1: getCallerClass 2: Test.test 3: main

    52         return Reflection.getCallerClass(3);

    53     }

    54 

    55     static void assertEquals(Class<?> c, Class<?> expected) {

    56         if (c != expected) {

    57             throw new RuntimeException("Incorrect caller: " + c);

    58         }

    59     }

    60 

    61     static class Test {

    62         // Returns the caller of this method

    63         public static Class<?> test() {

    64             return new GetCallerClassWithDepth().getCallerClass();

    65         }

    66 

    67         // Returns the caller of this method

    68         public static Class<?> caller() {

    69             // 0: Reflection 1: Test.caller 2: main

    70             return Reflection.getCallerClass(2);

    71         }

    72         public static void selfTest() {

    73             // 0: Reflection 1: Test.selfTest

    74             Class<?> c = Reflection.getCallerClass(1);

    75             assertEquals(c, Test.class);

    76             Inner1.deep();

    77         }

    78 

    79         static class Inner1 {

    80             static void deep() {

    81                  deeper();

    82             }

    83             static void deeper() {

    84                  Inner2.deepest();

    85             }

    86             static class Inner2 {

    87                 static void deepest() {

    88                     // 0: Reflection 1: deepest 2: deeper 3: deep 4: Test.selfTest

    89                     Class<?> c = Reflection.getCallerClass(4);

    90                     assertEquals(c, Test.class);

    91                 }

    92             }

    93         }

    94     }

    95 }