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.impl;
26
27 import org.apache.log4j.Level;
28 import org.slf4j.ILoggerFactory;
29 import org.slf4j.helpers.Util;
30 import org.slf4j.log4j12.Log4jLoggerFactory;
31 import org.slf4j.spi.LoggerFactoryBinder;
32
33 /**
34 * As of SLF4J version 1.8.0, the static binder mechanism is deprecated.
35 *
36 * <p>This class exists for backward compatibility earlier versions of slf4j-api.jar,
37 * in particular in the 1.6.x and the 1.7.x series.</p>
38 *
39 * <p>Note that this class is likely to be removed in future releases of SLF4J.</p>
40 *
41 * @author Ceki Gülcü
42 */
43 public class StaticLoggerBinder implements LoggerFactoryBinder {
44
45 /**
46 * The unique instance of this class.
47 *
48 */
49 private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
50
51 /**
52 * Return the singleton of this class.
53 *
54 * @return the StaticLoggerBinder singleton
55 */
56 public static final StaticLoggerBinder getSingleton() {
57 return SINGLETON;
58 }
59
60 /**
61 * Declare compatibility with the 1.6.x and the 1.7.x series
62 */
63 // to avoid constant folding by the compiler, this field must *not* be final
64 public static String REQUESTED_API_VERSION = "1.6.99"; // !final
65
66 private static final String loggerFactoryClassStr = Log4jLoggerFactory.class.getName();
67
68 /**
69 * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
70 * method should always be the same object
71 */
72 private final ILoggerFactory loggerFactory;
73
74 private StaticLoggerBinder() {
75 loggerFactory = new Log4jLoggerFactory();
76 try {
77 @SuppressWarnings("unused")
78 Level level = Level.TRACE;
79 } catch (NoSuchFieldError nsfe) {
80 Util.report("This version of SLF4J requires log4j version 1.2.12 or later. See also http://www.slf4j.org/codes.html#log4j_version");
81 }
82 }
83
84 public ILoggerFactory getLoggerFactory() {
85 return loggerFactory;
86 }
87
88 public String getLoggerFactoryClassStr() {
89 return loggerFactoryClassStr;
90 }
91 }