1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.log4j.spi;
18
19 import org.apache.log4j.Level;
20 import org.apache.log4j.Category;
21 import org.apache.log4j.Logger;
22 import org.apache.log4j.Appender;
23
24 import java.util.Enumeration;
25 import java.util.Vector;
26
27 /**
28 * No-operation implementation of LoggerRepository which is used when
29 * LogManager.repositorySelector is erroneously nulled during class reloading.
30 * @since 1.2.15
31 */
32 public final class NOPLoggerRepository implements LoggerRepository {
33 /**
34 * {@inheritDoc}
35 */
36 public void addHierarchyEventListener(final HierarchyEventListener listener) {
37 }
38
39 /**
40 * {@inheritDoc}
41 */
42 public boolean isDisabled(final int level) {
43 return true;
44 }
45
46 /**
47 * {@inheritDoc}
48 */
49 public void setThreshold(final Level level) {
50 }
51
52 /**
53 * {@inheritDoc}
54 */
55 public void setThreshold(final String val) {
56 }
57
58 /**
59 * {@inheritDoc}
60 */
61 public void emitNoAppenderWarning(final Category cat) {
62 }
63
64 /**
65 * {@inheritDoc}
66 */
67 public Level getThreshold() {
68 return Level.OFF;
69 }
70
71 /**
72 * {@inheritDoc}
73 */
74 public Logger getLogger(final String name) {
75 return new NOPLogger(this, name);
76 }
77
78 /**
79 * {@inheritDoc}
80 */
81 public Logger getLogger(final String name, final LoggerFactory factory) {
82 return new NOPLogger(this, name);
83 }
84
85 /**
86 * {@inheritDoc}
87 */
88 public Logger getRootLogger() {
89 return new NOPLogger(this, "root");
90 }
91
92 /**
93 * {@inheritDoc}
94 */
95 public Logger exists(final String name) {
96 return null;
97 }
98
99 /**
100 * {@inheritDoc}
101 */
102 public void shutdown() {
103 }
104
105 /**
106 * {@inheritDoc}
107 */
108 public Enumeration getCurrentLoggers() {
109 return new Vector().elements();
110 }
111
112 /**
113 * {@inheritDoc}
114 */
115 public Enumeration getCurrentCategories() {
116 return getCurrentLoggers();
117 }
118
119
120 /**
121 * {@inheritDoc}
122 */
123 public void fireAddAppenderEvent(Category logger, Appender appender) {
124 }
125
126 /**
127 * {@inheritDoc}
128 */
129 public void resetConfiguration() {
130 }
131 }