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 18 package org.apache.logging.log4j.util; 19 20 import java.io.OutputStream; 21 import java.io.PrintWriter; 22 import java.io.Writer; 23 import java.util.Objects; 24 25 /** 26 * PrintWriter-based logging utility for classes too low level to use {@link org.apache.logging.log4j.status.StatusLogger}. 27 * Such classes cannot use StatusLogger as StatusLogger or {@link org.apache.logging.log4j.simple.SimpleLogger} depends 28 * on them for initialization. Other framework classes should stick to using StatusLogger. 29 * 30 * @since 2.6 31 */ 32 final class LowLevelLogUtil { 33 34 private static PrintWriter writer = new PrintWriter(System.err, true); 35 36 public static void logException(final Throwable exception) { 37 exception.printStackTrace(writer); 38 } 39 40 public static void logException(final String message, final Throwable exception) { 41 if (message != null) { 42 writer.println(message); 43 } 44 logException(exception); 45 } 46 47 /** 48 * Sets the underlying OutputStream where exceptions are printed to. 49 * 50 * @param out the OutputStream to log to 51 */ 52 public static void setOutputStream(final OutputStream out) { 53 LowLevelLogUtil.writer = new PrintWriter(Objects.requireNonNull(out), true); 54 } 55 56 /** 57 * Sets the underlying Writer where exceptions are printed to. 58 * 59 * @param writer the Writer to log to 60 */ 61 public static void setWriter(final Writer writer) { 62 LowLevelLogUtil.writer = new PrintWriter(Objects.requireNonNull(writer), true); 63 } 64 65 private LowLevelLogUtil() { 66 } 67 }