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
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 {
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 */
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
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
81 static final public void report(String msg) {
82 System.err.println("SLF4J: " + msg);
83 }
84 }