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.commons.io.output;
18 
19 import java.io.IOException;
20 import java.io.OutputStream;
21 
22 /**
23  * This OutputStream writes all data to the famous <b>/dev/null</b>.
24  * <p>
25  * This output stream has no destination (file/socket etc.) and all
26  * bytes written to it are ignored and lost.
27  *
28  * @author Jeremias Maerki
29  * @version $Id: NullOutputStream.java 610010 2008-01-08 14:50:59Z niallp $
30  */
31 public class NullOutputStream extends OutputStream {
32 
33     /**
34      * A singleton.
35      */
36     public static final NullOutputStream NULL_OUTPUT_STREAM = new NullOutputStream();
37 
38     /**
39      * Does nothing - output to <code>/dev/null</code>.
40      * @param b The bytes to write
41      * @param off The start offset
42      * @param len The number of bytes to write
43      */
write(byte[] b, int off, int len)44     public void write(byte[] b, int off, int len) {
45         //to /dev/null
46     }
47 
48     /**
49      * Does nothing - output to <code>/dev/null</code>.
50      * @param b The byte to write
51      */
write(int b)52     public void write(int b) {
53         //to /dev/null
54     }
55 
56     /**
57      * Does nothing - output to <code>/dev/null</code>.
58      * @param b The bytes to write
59      * @throws IOException never
60      */
write(byte[] b)61     public void write(byte[] b) throws IOException {
62         //to /dev/null
63     }
64 
65 }
66