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.Logger;
20 import org.slf4j.LoggerFactory;
21 import org.slf4j.helpers.NOPLoggerFactory;
22 import org.slf4j.spi.LocationAwareLogger;
23
24 /**
25 * Logger factory which creates a <a href="http://www.slf4j.org/">SLF4J</a>
26 * logger.
27 */
28 public class Slf4JLoggerFactory extends InternalLoggerFactory {
29
30 @SuppressWarnings("deprecation")
31 public static final InternalLoggerFactory INSTANCE = new Slf4JLoggerFactory();
32
33 /**
34 * @deprecated Use {@link #INSTANCE} instead.
35 */
36 @Deprecated
37 public Slf4JLoggerFactory() {
38 }
39
40 Slf4JLoggerFactory(boolean failIfNOP) {
41 assert failIfNOP; // Should be always called with true.
42 if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
43 throw new NoClassDefFoundError("NOPLoggerFactory not supported");
44 }
45 }
46
47 @Override
48 public InternalLogger newInstance(String name) {
49 return wrapLogger(LoggerFactory.getLogger(name));
50 }
51
52 // package-private for testing.
53 static InternalLogger wrapLogger(Logger logger) {
54 return logger instanceof LocationAwareLogger ?
55 new LocationAwareSlf4JLogger((LocationAwareLogger) logger) : new Slf4JLogger(logger);
56 }
57 }
58