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
18 package org.apache.logging.log4j.core.util;
19
20 import java.io.IOException;
21 import java.io.OutputStream;
22
23 /**
24 * Writes all data to the famous <b>/dev/null</b>.
25 * <p>
26 * This output stream has no destination (file/socket etc.) and all bytes written to it are ignored and lost.
27 * </p>
28 * Originally from Apache Commons IO.
29 *
30 * @since 2.3
31 */
32 public class NullOutputStream extends OutputStream {
33
34 /**
35 * A singleton.
36 */
37 public static final NullOutputStream NULL_OUTPUT_STREAM = new NullOutputStream();
38
39 /**
40 * Does nothing - output to <code>/dev/null</code>.
41 *
42 * @param b
43 * The bytes to write
44 * @param off
45 * The start offset
46 * @param len
47 * The number of bytes to write
48 */
49 @Override
50 public void write(final byte[] b, final int off, final int len) {
51 // to /dev/null
52 }
53
54 /**
55 * Does nothing - output to <code>/dev/null</code>.
56 *
57 * @param b
58 * The byte to write
59 */
60 @Override
61 public void write(final int b) {
62 // to /dev/null
63 }
64
65 /**
66 * Does nothing - output to <code>/dev/null</code>.
67 *
68 * @param b
69 * The bytes to write
70 * @throws IOException
71 * never
72 */
73 @Override
74 public void write(final byte[] b) throws IOException {
75 // to /dev/null
76 }
77 }