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 package org.slf4j.impl;
18
19 import org.slf4j.ILoggerFactory;
20 import org.slf4j.helpers.Log4JLoggerFactory;
21 import org.slf4j.spi.LoggerFactoryBinder;
22
23 /**
24 *
25 */
26 public final class StaticLoggerBinder implements LoggerFactoryBinder {
27
28 /**
29 * Declare the version of the SLF4J API this implementation is compiled
30 * against. The value of this field is usually modified with each release.
31 */
32 // to avoid constant folding by the compiler, this field must *not* be final
33 public static String REQUESTED_API_VERSION = "1.6"; // !final
34
35 private static final String LOGGER_FACTORY_CLASS_STR = Log4JLoggerFactory.class.getName();
36
37 /**
38 * The unique instance of this class.
39 */
40 private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
41
42 /**
43 * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
44 * method should always be the same object
45 */
46 private final ILoggerFactory loggerFactory;
47
48 /**
49 * Private constructor to prevent instantiation
50 */
51 private StaticLoggerBinder() {
52 loggerFactory = new Log4JLoggerFactory();
53 }
54
55 /**
56 * Returns the singleton of this class.
57 *
58 * @return the StaticLoggerBinder singleton
59 */
60 public static StaticLoggerBinder getSingleton() {
61 return SINGLETON;
62 }
63
64 /**
65 * Returns the factory.
66 * @return the factor.
67 */
68 @Override
69 public ILoggerFactory getLoggerFactory() {
70 return loggerFactory;
71 }
72
73 /**
74 * Returns the class name.
75 * @return the class name;
76 */
77 @Override
78 public String getLoggerFactoryClassStr() {
79 return LOGGER_FACTORY_CLASS_STR;
80 }
81 }