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.ULogger;
20
21
22 /**
23 * A no operation (NOP) implementation of {@link ULogger}.
24 *
25 * @author Ceki Gülcü
26 */
27 public final class NOPULogger implements ULogger {
28
29 /**
30 * The unique instance of NOPLogger.
31 */
32 public static final NOPULogger NOP_LOGGER = new NOPULogger();
33
34 /**
35 * There is no point in people creating multiple instances of NullLogger.
36 * Hence, the private access modifier.
37 */
38 private NOPULogger() {
39 super();
40 }
41
42 /**
43 * Get instance.
44 *
45 * @param name logger name.
46 * @return logger.
47 */
48 public static NOPULogger getLogger(final String name) {
49 return NOP_LOGGER;
50 }
51
52 /**
53 * {@inheritDoc}
54 */
55 public boolean isDebugEnabled() {
56 return false;
57 }
58
59 /**
60 * {@inheritDoc}
61 */
62 public void debug(final Object msg) {
63 // NOP
64 }
65
66 /**
67 * {@inheritDoc}
68 */
69 public void debug(final Object parameterizedMsg, final Object param1) {
70 // NOP
71 }
72
73 /**
74 * {@inheritDoc}
75 */
76 public void debug(final String parameterizedMsg,
77 final Object param1,
78 final Object param2) {
79 // NOP
80 }
81
82 /**
83 * {@inheritDoc}
84 */
85 public void debug(final Object msg, final Throwable t) {
86 // NOP
87 }
88
89 /**
90 * {@inheritDoc}
91 */
92 public boolean isInfoEnabled() {
93 // NOP
94 return false;
95 }
96
97 /**
98 * {@inheritDoc}
99 */
100 public void info(final Object msg) {
101 // NOP
102 }
103
104 /**
105 * {@inheritDoc}
106 */
107 public void info(final Object parameterizedMsg, final Object param1) {
108 // NOP
109 }
110
111 /**
112 * {@inheritDoc}
113 */
114 public void info(final String parameterizedMsg,
115 final Object param1, final Object param2) {
116 // NOP
117 }
118
119 /**
120 * {@inheritDoc}
121 */
122 public void info(final Object msg, final Throwable t) {
123 // NOP
124 }
125
126 /**
127 * {@inheritDoc}
128 */
129 public boolean isWarnEnabled() {
130 return false;
131 }
132
133 /**
134 * {@inheritDoc}
135 */
136 public void warn(final Object msg) {
137 // NOP
138 }
139
140 /**
141 * {@inheritDoc}
142 */
143 public void warn(final Object parameterizedMsg,
144 final Object param1) {
145 // NOP
146 }
147
148 /**
149 * {@inheritDoc}
150 */
151 public void warn(final String parameterizedMsg,
152 final Object param1,
153 final Object param2) {
154 // NOP
155 }
156
157 /**
158 * {@inheritDoc}
159 */
160 public void warn(final Object msg, final Throwable t) {
161 // NOP
162 }
163
164 /**
165 * {@inheritDoc}
166 */
167 public boolean isErrorEnabled() {
168 return false;
169 }
170
171 /**
172 * {@inheritDoc}
173 */
174 public void error(final Object msg) {
175 // NOP
176 }
177
178 /**
179 * {@inheritDoc}
180 */
181 public void error(final Object parameterizedMsg, final Object param1) {
182 // NOP
183 }
184
185 /**
186 * {@inheritDoc}
187 */
188 public void error(final String parameterizedMsg,
189 final Object param1,
190 final Object param2) {
191 // NOP
192 }
193
194 /**
195 * {@inheritDoc}
196 */
197 public void error(final Object msg, final Throwable t) {
198 // NOP
199 }
200
201 }