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 8137058
  27  * @summary Basic test for the unsupported Reflection.getCallerClass(int)
  28  * @modules jdk.unsupported
  29  */
  30 
  31 import sun.reflect.Reflection;
  32 
  33 public class GetCallerClassWithDepth {
  34     public static void main(String[] args) throws Exception {
  35         Class<?> c = Test.test();
  36         assertEquals(c, GetCallerClassWithDepth.class);
  37         Class<?> caller = Test.caller();
  38         assertEquals(caller, GetCallerClassWithDepth.class);
  39         Test.selfTest();
  40 
  41         try {
  42             Reflection.getCallerClass(-1);
  43             throw new RuntimeException("getCallerClass(-1) should fail");
  44         } catch (Error e) {
  45             System.out.println("Expected: " + e.getMessage());
  46         }
  47     }
  48 
  49     public Class<?> getCallerClass() {
  50         // 0: Reflection 1: getCallerClass 2: Test.test 3: main
  51         return Reflection.getCallerClass(3);
  52     }
  53 
  54     static void assertEquals(Class<?> c, Class<?> expected) {
  55         if (c != expected) {
  56             throw new RuntimeException("Incorrect caller: " + c);
  57         }
  58     }
  59 
  60     static class Test {
  61         // Returns the caller of this method
  62         public static Class<?> test() {
  63             return new GetCallerClassWithDepth().getCallerClass();
  64         }
  65 
  66         // Returns the caller of this method
  67         public static Class<?> caller() {
  68             // 0: Reflection 1: Test.caller 2: main
  69             return Reflection.getCallerClass(2);
  70         }
  71         public static void selfTest() {
  72             // 0: Reflection 1: Test.selfTest
  73             Class<?> c = Reflection.getCallerClass(1);
  74             assertEquals(c, Test.class);
  75             Inner1.deep();
  76         }
  77 
  78         static class Inner1 {
  79             static void deep() {
  80                  deeper();
  81             }
  82             static void deeper() {
  83                  Inner2.deepest();
  84             }
  85             static class Inner2 {
  86                 static void deepest() {
  87                     // 0: Reflection 1: deepest 2: deeper 3: deep 4: Test.selfTest
  88                     Class<?> c = Reflection.getCallerClass(4);
  89                     assertEquals(c, Test.class);
  90                 }
  91             }
  92         }
  93     }
  94 }