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  * Classic splitter of OutputStream. Named after the unix 'tee'
24  * command. It allows a stream to be branched off so there
25  * are now two streams.
26  *
27  * @version $Id: TeeOutputStream.java 610010 2008-01-08 14:50:59Z niallp $
28  */
29 public class TeeOutputStream extends ProxyOutputStream {
30 
31     /** the second OutputStream to write to */
32     protected OutputStream branch;
33 
34     /**
35      * Constructs a TeeOutputStream.
36      * @param out the main OutputStream
37      * @param branch the second OutputStream
38      */
TeeOutputStream( OutputStream out, OutputStream branch )39     public TeeOutputStream( OutputStream out, OutputStream branch ) {
40         super(out);
41         this.branch = branch;
42     }
43 
44     /**
45      * Write the bytes to both streams.
46      * @param b the bytes to write
47      * @throws IOException if an I/O error occurs
48      */
write(byte[] b)49     public synchronized void write(byte[] b) throws IOException {
50         super.write(b);
51         this.branch.write(b);
52     }
53 
54     /**
55      * Write the specified bytes to both streams.
56      * @param b the bytes to write
57      * @param off The start offset
58      * @param len The number of bytes to write
59      * @throws IOException if an I/O error occurs
60      */
write(byte[] b, int off, int len)61     public synchronized void write(byte[] b, int off, int len) throws IOException {
62         super.write(b, off, len);
63         this.branch.write(b, off, len);
64     }
65 
66     /**
67      * Write a byte to both streams.
68      * @param b the byte to write
69      * @throws IOException if an I/O error occurs
70      */
write(int b)71     public synchronized void write(int b) throws IOException {
72         super.write(b);
73         this.branch.write(b);
74     }
75 
76     /**
77      * Flushes both streams.
78      * @throws IOException if an I/O error occurs
79      */
flush()80     public void flush() throws IOException {
81         super.flush();
82         this.branch.flush();
83     }
84 
85     /**
86      * Closes both streams.
87      * @throws IOException if an I/O error occurs
88      */
close()89     public void close() throws IOException {
90         super.close();
91         this.branch.close();
92     }
93 
94 }
95