001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017package org.apache.logging.log4j.core.helpers; 018 019import java.io.IOException; 020import java.io.InterruptedIOException; 021import java.io.LineNumberReader; 022import java.io.PrintWriter; 023import java.io.StringReader; 024import java.io.StringWriter; 025import java.util.ArrayList; 026import java.util.List; 027 028/** 029 * Helps with Throwable objects. 030 */ 031public class Throwables { 032 033 /** 034 * Converts a Throwable into a List of Strings 035 * 036 * @param throwable 037 * the Throwable 038 * @return a List of Strings 039 */ 040 public static List<String> toStringList(final Throwable throwable) { 041 final StringWriter sw = new StringWriter(); 042 final PrintWriter pw = new PrintWriter(sw); 043 try { 044 throwable.printStackTrace(pw); 045 } catch (final RuntimeException ex) { 046 // Ignore any exceptions. 047 } 048 pw.flush(); 049 final LineNumberReader reader = new LineNumberReader(new StringReader(sw.toString())); 050 final ArrayList<String> lines = new ArrayList<String>(); 051 try { 052 String line = reader.readLine(); 053 while (line != null) { 054 lines.add(line); 055 line = reader.readLine(); 056 } 057 } catch (final IOException ex) { 058 if (ex instanceof InterruptedIOException) { 059 Thread.currentThread().interrupt(); 060 } 061 lines.add(ex.toString()); 062 } 063 return lines; 064 } 065 066}