View Javadoc
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.apache.maven.cli.logging;
20  
21  import org.codehaus.plexus.logging.Logger;
22  import org.codehaus.plexus.logging.LoggerManager;
23  import org.slf4j.ILoggerFactory;
24  import org.slf4j.LoggerFactory;
25  
26  /**
27   * Use an SLF4J {@link org.slf4j.ILoggerFactory} as a backing for a Plexus
28   * {@link org.codehaus.plexus.logging.LoggerManager},
29   * ignoring Plexus logger API parts that are not classical and probably not really used.
30   *
31   * @author Jason van Zyl
32   * @since 3.1
33   */
34  public class Slf4jLoggerManager implements LoggerManager {
35  
36      private ILoggerFactory loggerFactory;
37  
38      public Slf4jLoggerManager() {
39          loggerFactory = LoggerFactory.getILoggerFactory();
40      }
41  
42      public Logger getLoggerForComponent(String role) {
43          return new Slf4jLogger(loggerFactory.getLogger(role));
44      }
45  
46      /**
47       * The logger name for a component with a non-null hint is <code>role.hint</code>.
48       * <b>Warning</b>: this does not conform to logger name as class name convention.
49       * (and what about <code>null</code> and <code>default</code> hint equivalence?)
50       */
51      public Logger getLoggerForComponent(String role, String hint) {
52          return (null == hint
53                  ? getLoggerForComponent(role)
54                  : new Slf4jLogger(loggerFactory.getLogger(role + '.' + hint)));
55      }
56  
57      //
58      // Trying to give loggers back is a bad idea. Ceki said so :-)
59      // notice to self: what was this method supposed to do?
60      //
61      /**
62       * <b>Warning</b>: ignored.
63       */
64      public void returnComponentLogger(String role) {}
65  
66      /**
67       * <b>Warning</b>: ignored.
68       */
69      public void returnComponentLogger(String role, String hint) {}
70  
71      /**
72       * <b>Warning</b>: ignored (always return <code>0</code>).
73       */
74      public int getThreshold() {
75          return 0;
76      }
77  
78      /**
79       * <b>Warning</b>: ignored.
80       */
81      public void setThreshold(int threshold) {}
82  
83      /**
84       * <b>Warning</b>: ignored.
85       */
86      public void setThresholds(int threshold) {}
87  
88      /**
89       * <b>Warning</b>: ignored (always return <code>0</code>).
90       */
91      public int getActiveLoggerCount() {
92          return 0;
93      }
94  }