1 /*
2 * Copyright 2016 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty5.util.internal;
17
18 import java.io.ByteArrayOutputStream;
19 import java.io.IOException;
20 import java.io.PrintStream;
21 import java.util.List;
22
23 public final class ThrowableUtil {
24
25 private ThrowableUtil() { }
26
27 /**
28 * Set the {@link StackTraceElement} for the given {@link Throwable}, using the {@link Class} and method name.
29 */
30 public static <T extends Throwable> T unknownStackTrace(T cause, Class<?> clazz, String method) {
31 cause.setStackTrace(new StackTraceElement[] { new StackTraceElement(clazz.getName(), method, null, -1)});
32 return cause;
33 }
34
35 /**
36 * Gets the stack trace from a Throwable as a String.
37 *
38 * @param cause the {@link Throwable} to be examined
39 * @return the stack trace as generated by {@link Throwable#printStackTrace(java.io.PrintWriter)} method.
40 */
41 public static String stackTraceToString(Throwable cause) {
42 ByteArrayOutputStream out = new ByteArrayOutputStream();
43 PrintStream pout = new PrintStream(out);
44 cause.printStackTrace(pout);
45 pout.flush();
46 try {
47 return new String(out.toByteArray());
48 } finally {
49 try {
50 out.close();
51 } catch (IOException ignore) {
52 // ignore as should never happen
53 }
54 }
55 }
56
57 public static void addSuppressed(Throwable target, Throwable suppressed) {
58 target.addSuppressed(suppressed);
59 }
60
61 public static void addSuppressedAndClear(Throwable target, List<Throwable> suppressed) {
62 addSuppressed(target, suppressed);
63 suppressed.clear();
64 }
65
66 public static void addSuppressed(Throwable target, List<Throwable> suppressed) {
67 for (Throwable t : suppressed) {
68 addSuppressed(target, t);
69 }
70 }
71 }