1 package org.eclipse.aether.spi.log;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 /**
23 * A logger factory that disables any logging.
24 *
25 * @deprecated Use SLF4J instead
26 */
27 @Deprecated
28 public final class NullLoggerFactory
29 implements LoggerFactory
30 {
31
32 /**
33 * The singleton instance of this factory.
34 */
35 public static final LoggerFactory INSTANCE = new NullLoggerFactory();
36
37 /**
38 * The singleton logger used by this factory.
39 */
40 public static final Logger LOGGER = new NullLogger();
41
42 public Logger getLogger( String name )
43 {
44 return LOGGER;
45 }
46
47 private NullLoggerFactory()
48 {
49 // hide constructor
50 }
51
52 /**
53 * Gets a logger from the specified factory for the given class, falling back to a logger from this factory if the
54 * specified factory is {@code null} or fails to provide a logger.
55 *
56 * @param loggerFactory The logger factory from which to get the logger, may be {@code null}.
57 * @param type The class for which to get the logger, must not be {@code null}.
58 * @return The requested logger, never {@code null}.
59 */
60 public static Logger getSafeLogger( LoggerFactory loggerFactory, Class<?> type )
61 {
62 if ( loggerFactory == null )
63 {
64 return LOGGER;
65 }
66 Logger logger = loggerFactory.getLogger( type.getName() );
67 if ( logger == null )
68 {
69 return LOGGER;
70 }
71 return logger;
72 }
73
74 }