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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.apache.logging.slf4j;
18  
19  import java.net.URI;
20  
21  import org.apache.logging.log4j.spi.LoggerContext;
22  import org.apache.logging.log4j.spi.LoggerContextFactory;
23  import org.apache.logging.log4j.status.StatusLogger;
24  import org.apache.logging.log4j.util.LoaderUtil;
25  
26  /**
27   *
28   */
29  public class SLF4JLoggerContextFactory implements LoggerContextFactory {
30      private static final StatusLogger LOGGER = StatusLogger.getLogger();
31      private static LoggerContext context = new SLF4JLoggerContext();
32  
33      public SLF4JLoggerContextFactory() {
34          // LOG4J2-230, LOG4J2-204 (improve error reporting when misconfigured)
35          boolean misconfigured = false;
36          try {
37              LoaderUtil.loadClass("org.slf4j.helpers.Log4jLoggerFactory");
38              misconfigured = true;
39          } catch (final ClassNotFoundException classNotFoundIsGood) {
40              LOGGER.debug("org.slf4j.helpers.Log4jLoggerFactory is not on classpath. Good!");
41          }
42          if (misconfigured) {
43              throw new IllegalStateException("slf4j-impl jar is mutually exclusive with log4j-to-slf4j jar "
44                      + "(the first routes calls from SLF4J to Log4j, the second from Log4j to SLF4J)");
45          }
46      }
47  
48      @Override
49      public LoggerContext getContext(final String fqcn, final ClassLoader loader, final Object externalContext,
50                                      final boolean currentContext) {
51          return context;
52      }
53  
54      @Override
55      public LoggerContext getContext(final String fqcn, final ClassLoader loader, final Object externalContext,
56                                      final boolean currentContext, final URI configLocation, final String name) {
57          return context;
58      }
59  
60      @Override
61      public void removeContext(final LoggerContext ignored) {
62      }
63  }