1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.slf4j.impl;
20
21 import org.slf4j.ILoggerFactory;
22 import org.slf4j.spi.LoggerFactoryBinder;
23
24 /**
25 * SLF4J LoggerFactoryBinder implementation using MavenSimpleLogger.
26 * This class is part of the required classes used to specify an
27 * SLF4J logger provider implementation.
28 *
29 * @since 3.5.1
30 */
31 public final class StaticLoggerBinder implements LoggerFactoryBinder {
32 /**
33 * Declare the version of the SLF4J API this implementation is compiled
34 * against. The value of this field is usually modified with each release.
35 */
36 // to avoid constant folding by the compiler, this field must *not* be final
37 @SuppressWarnings({"checkstyle:staticvariablename", "checkstyle:visibilitymodifier"})
38 public static String REQUESTED_API_VERSION = "1.7.25"; // !final
39
40 private static final String LOGGER_FACTORY_CLASS_STR = MavenSimpleLoggerFactory.class.getName();
41
42 /**
43 * The unique instance of this class.
44 */
45 private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
46
47 /**
48 * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
49 * method should always be the same object
50 */
51 private final ILoggerFactory loggerFactory;
52
53 /**
54 * Private constructor to prevent instantiation
55 */
56 private StaticLoggerBinder() {
57 loggerFactory = new MavenSimpleLoggerFactory();
58 }
59
60 /**
61 * Returns the singleton of this class.
62 */
63 public static StaticLoggerBinder getSingleton() {
64 return SINGLETON;
65 }
66
67 /**
68 * Returns the factory.
69 */
70 @Override
71 public ILoggerFactory getLoggerFactory() {
72 return loggerFactory;
73 }
74
75 /**
76 * Returns the class name.
77 */
78 @Override
79 public String getLoggerFactoryClassStr() {
80 return LOGGER_FACTORY_CLASS_STR;
81 }
82 }