1 /*
2 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * Additionally licensed with:
19 *
20 * Licensed under the Apache License, Version 2.0 (the "License");
21 * you may not use this file except in compliance with the License.
22 * You may obtain a copy of the License at
23 *
24 * http://www.apache.org/licenses/LICENSE-2.0
25 *
26 * Unless required by applicable law or agreed to in writing, software
27 * distributed under the License is distributed on an "AS IS" BASIS,
28 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
29 * See the License for the specific language governing permissions and
30 * limitations under the License.
31 */
32 package org.spf4j.base;
33
34 import java.lang.reflect.Field;
35 import java.security.AccessController;
36 import java.security.PrivilegedAction;
37 import java.util.Collections;
38 import java.util.List;
39 import javax.annotation.ParametersAreNonnullByDefault;
40
41 /**
42 *
43 * @author Zoltan Farkas
44 */
45 @ParametersAreNonnullByDefault
46 public final class UnsafeThrowable {
47
48 private UnsafeThrowable() { }
49
50 private static final Field SUPPRESSED_FIELD;
51
52 static {
53 SUPPRESSED_FIELD = AccessController.doPrivileged((PrivilegedAction<Field>) () -> {
54 Field suppressedField;
55 try {
56 suppressedField = Throwable.class.getDeclaredField("suppressedExceptions");
57 } catch (NoSuchFieldException | SecurityException ex) {
58 throw new ExceptionInInitializerError(ex);
59 }
60 suppressedField.setAccessible(true);
61 return suppressedField;
62 });
63 }
64
65 public static List<Throwable> getSuppressedNoCopy(final Throwable t) {
66 try {
67 final List<Throwable> suppressedExceptions = (List<Throwable>) SUPPRESSED_FIELD.get(t);
68 if (suppressedExceptions == null) {
69 return Collections.emptyList();
70 } else {
71 return suppressedExceptions;
72 }
73 } catch (IllegalArgumentException | IllegalAccessException ex) {
74 throw new RuntimeException(ex);
75 }
76 }
77
78
79 }