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