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 }