1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.core.helpers;
18
19 import java.io.IOException;
20 import java.io.InterruptedIOException;
21 import java.io.LineNumberReader;
22 import java.io.PrintWriter;
23 import java.io.StringReader;
24 import java.io.StringWriter;
25 import java.util.ArrayList;
26 import java.util.List;
27
28 /**
29 * Helps with Throwable objects.
30 */
31 public class Throwables {
32
33 /**
34 * Converts a Throwable into a List of Strings
35 *
36 * @param throwable
37 * the Throwable
38 * @return a List of Strings
39 */
40 public static List<String> toStringList(final Throwable throwable) {
41 final StringWriter sw = new StringWriter();
42 final PrintWriter pw = new PrintWriter(sw);
43 try {
44 throwable.printStackTrace(pw);
45 } catch (final RuntimeException ex) {
46 // Ignore any exceptions.
47 }
48 pw.flush();
49 final LineNumberReader reader = new LineNumberReader(new StringReader(sw.toString()));
50 final ArrayList<String> lines = new ArrayList<String>();
51 try {
52 String line = reader.readLine();
53 while (line != null) {
54 lines.add(line);
55 line = reader.readLine();
56 }
57 } catch (final IOException ex) {
58 if (ex instanceof InterruptedIOException) {
59 Thread.currentThread().interrupt();
60 }
61 lines.add(ex.toString());
62 }
63 return lines;
64 }
65
66 }