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.eclipse.aether.spi.log;
20
21 /**
22 * A logger factory that disables any logging.
23 *
24 * @deprecated Use SLF4J instead
25 */
26 @Deprecated
27 public final class NullLoggerFactory implements LoggerFactory {
28
29 /**
30 * The singleton instance of this factory.
31 */
32 public static final LoggerFactory INSTANCE = new NullLoggerFactory();
33
34 /**
35 * The singleton logger used by this factory.
36 */
37 public static final Logger LOGGER = new NullLogger();
38
39 public Logger getLogger(String name) {
40 return LOGGER;
41 }
42
43 private NullLoggerFactory() {
44 // hide constructor
45 }
46
47 /**
48 * Gets a logger from the specified factory for the given class, falling back to a logger from this factory if the
49 * specified factory is {@code null} or fails to provide a logger.
50 *
51 * @param loggerFactory The logger factory from which to get the logger, may be {@code null}.
52 * @param type The class for which to get the logger, must not be {@code null}.
53 * @return The requested logger, never {@code null}.
54 */
55 public static Logger getSafeLogger(LoggerFactory loggerFactory, Class<?> type) {
56 if (loggerFactory == null) {
57 return LOGGER;
58 }
59 Logger logger = loggerFactory.getLogger(type.getName());
60 if (logger == null) {
61 return LOGGER;
62 }
63 return logger;
64 }
65 }