| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache license, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the license for the specific language governing permissions and |
| * limitations under the license. |
| */ |
| package org.apache.logging.log4j.core.util; |
| |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| import java.io.LineNumberReader; |
| import java.io.PrintWriter; |
| import java.io.StringReader; |
| import java.io.StringWriter; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Helps with Throwable objects. |
| */ |
| public final class Throwables { |
| |
| private Throwables() { |
| } |
| |
| /** |
| * Returns the deepest cause of the given {@code throwable}. |
| * |
| * @param throwable the throwable to navigate |
| * @return the deepest throwable or the given throwable |
| */ |
| public static Throwable getRootCause(final Throwable throwable) { |
| Throwable cause; |
| Throwable root = throwable; |
| while ((cause = root.getCause()) != null) { |
| root = cause; |
| } |
| return root; |
| } |
| |
| /** |
| * Converts a Throwable stack trace into a List of Strings. |
| * |
| * @param throwable the Throwable |
| * @return a List of Strings |
| */ |
| public static List<String> toStringList(final Throwable throwable) { |
| final StringWriter sw = new StringWriter(); |
| final PrintWriter pw = new PrintWriter(sw); |
| try { |
| throwable.printStackTrace(pw); |
| } catch (final RuntimeException ex) { |
| // Ignore any exceptions. |
| } |
| pw.flush(); |
| final List<String> lines = new ArrayList<>(); |
| final LineNumberReader reader = new LineNumberReader(new StringReader(sw.toString())); |
| try { |
| String line = reader.readLine(); |
| while (line != null) { |
| lines.add(line); |
| line = reader.readLine(); |
| } |
| } catch (final IOException ex) { |
| if (ex instanceof InterruptedIOException) { |
| Thread.currentThread().interrupt(); |
| } |
| lines.add(ex.toString()); |
| } finally { |
| Closer.closeSilently(reader); |
| } |
| return lines; |
| } |
| |
| /** |
| * Rethrows a {@link Throwable}. |
| * |
| * @param t the Throwable to throw. |
| * @since 2.1 |
| */ |
| public static void rethrow(final Throwable t) { |
| Throwables.<RuntimeException>rethrow0(t); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private static <T extends Throwable> void rethrow0(final Throwable t) throws T { |
| throw (T) t; |
| } |
| } |