1 /** 2 * Copyright (c) 2004-2011 QOS.ch 3 * All rights reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining 6 * a copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sublicense, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be 14 * included in all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 * 24 */ 25 package org.slf4j.helpers; 26 27 /** 28 * An internal utility class. 29 * 30 * @author Alexander Dorokhine 31 * @author Ceki Gülcü 32 */ 33 public final class Util { 34 Util()35 private Util() { 36 } 37 38 /** 39 * In order to call {@link SecurityManager#getClassContext()}, which is a 40 * protected method, we add this wrapper which allows the method to be visible 41 * inside this package. 42 */ 43 private static final class ClassContextSecurityManager extends SecurityManager { getClassContext()44 protected Class<?>[] getClassContext() { 45 return super.getClassContext(); 46 } 47 } 48 49 private static final ClassContextSecurityManager SECURITY_MANAGER = new ClassContextSecurityManager(); 50 51 /** 52 * Returns the name of the class which called the invoking method. 53 * 54 * @return the name of the class which called the invoking method. 55 */ getCallingClass()56 public static Class<?> getCallingClass() { 57 Class<?>[] trace = SECURITY_MANAGER.getClassContext(); 58 String thisClassName = Util.class.getName(); 59 60 // Advance until Util is found 61 int i; 62 for (i = 0; i < trace.length; i++) { 63 if (thisClassName.equals(trace[i].getName())) 64 break; 65 } 66 67 // trace[i] = Util; trace[i+1] = caller; trace[i+2] = caller's caller 68 if (i >= trace.length || i + 2 >= trace.length) { 69 throw new IllegalStateException("Failed to find org.slf4j.helpers.Util or its caller in the stack; " + "this should not happen"); 70 } 71 72 return trace[i + 2]; 73 } 74 report(String msg, Throwable t)75 static final public void report(String msg, Throwable t) { 76 System.err.println(msg); 77 System.err.println("Reported exception:"); 78 t.printStackTrace(); 79 } 80 report(String msg)81 static final public void report(String msg) { 82 System.err.println("SLF4J: " + msg); 83 } 84 } 85