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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.util.internal.logging;
17  
18  
19  import org.slf4j.LoggerFactory;
20  import org.slf4j.helpers.NOPLoggerFactory;
21  
22  /**
23   * Logger factory which creates a <a href="http://www.slf4j.org/">SLF4J</a>
24   * logger.
25   */
26  public class Slf4JLoggerFactory extends InternalLoggerFactory {
27  
28      @SuppressWarnings("deprecation")
29      public static final InternalLoggerFactory INSTANCE = new Slf4JLoggerFactory();
30  
31      /**
32       * @deprecated Use {@link #INSTANCE} instead.
33       */
34      @Deprecated
35      public Slf4JLoggerFactory() {
36      }
37  
38      Slf4JLoggerFactory(boolean failIfNOP) {
39          assert failIfNOP; // Should be always called with true.
40          if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
41              throw new NoClassDefFoundError("NOPLoggerFactory not supported");
42          }
43      }
44  
45      @Override
46      public InternalLogger newInstance(String name) {
47          return new Slf4JLogger(LoggerFactory.getLogger(name));
48      }
49  }