| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * 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). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.util; |
| |
| import static java.lang.StackWalker.Option.*; |
| import java.lang.StackWalker.StackFrame; |
| import java.util.stream.Collectors; |
| |
| import jdk.internal.reflect.CallerSensitive; |
| import jdk.internal.reflect.Reflection; |
| |
| public class CSM { |
| private static StackWalker walker = |
| StackWalker.getInstance(EnumSet.of(RETAIN_CLASS_REFERENCE, |
| SHOW_HIDDEN_FRAMES, |
| SHOW_REFLECT_FRAMES)); |
| |
| public static class Result { |
| public final List<Class<?>> callers; |
| public final List<StackWalker.StackFrame> frames; |
| Result(List<Class<?>> callers, |
| List<StackFrame> frames) { |
| this.callers = callers; |
| this.frames = frames; |
| } |
| } |
| |
| /** |
| * Returns the caller of this caller-sensitive method returned by |
| * by Reflection::getCallerClass. |
| * |
| * StackWalker::getCallerClass is expected to throw UOE |
| */ |
| @CallerSensitive |
| public static Class<?> caller() { |
| Class<?> c1 = Reflection.getCallerClass(); |
| |
| try { |
| Class<?> c2 = walker.getCallerClass(); |
| throw new RuntimeException("Exception not thrown by StackWalker::getCallerClass"); |
| } catch (UnsupportedOperationException e) {} |
| return c1; |
| } |
| |
| /** |
| * Returns the caller of this non-caller-sensitive method. |
| */ |
| public static Result getCallerClass() { |
| Class<?> caller = walker.getCallerClass(); |
| return new Result(List.of(caller), dump()); |
| } |
| |
| static List<StackFrame> dump() { |
| return walker.walk(s -> s.collect(Collectors.toList())); |
| } |
| } |