001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     * 
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.io.output;
018    
019    import java.io.IOException;
020    import java.io.OutputStream;
021    
022    /**
023     * Classic splitter of OutputStream. Named after the unix 'tee' 
024     * command. It allows a stream to be branched off so there 
025     * are now two streams.
026     *
027     * @version $Id: TeeOutputStream.java 610010 2008-01-08 14:50:59Z niallp $
028     */
029    public class TeeOutputStream extends ProxyOutputStream {
030    
031        /** the second OutputStream to write to */
032        protected OutputStream branch;
033    
034        /**
035         * Constructs a TeeOutputStream.
036         * @param out the main OutputStream
037         * @param branch the second OutputStream
038         */
039        public TeeOutputStream( OutputStream out, OutputStream branch ) {
040            super(out);
041            this.branch = branch;
042        }
043    
044        /**
045         * Write the bytes to both streams.
046         * @param b the bytes to write
047         * @throws IOException if an I/O error occurs
048         */
049        public synchronized void write(byte[] b) throws IOException {
050            super.write(b);
051            this.branch.write(b);
052        }
053    
054        /**
055         * Write the specified bytes to both streams.
056         * @param b the bytes to write
057         * @param off The start offset
058         * @param len The number of bytes to write
059         * @throws IOException if an I/O error occurs
060         */
061        public synchronized void write(byte[] b, int off, int len) throws IOException {
062            super.write(b, off, len);
063            this.branch.write(b, off, len);
064        }
065    
066        /**
067         * Write a byte to both streams.
068         * @param b the byte to write
069         * @throws IOException if an I/O error occurs
070         */
071        public synchronized void write(int b) throws IOException {
072            super.write(b);
073            this.branch.write(b);
074        }
075    
076        /**
077         * Flushes both streams.
078         * @throws IOException if an I/O error occurs
079         */
080        public void flush() throws IOException {
081            super.flush();
082            this.branch.flush();
083        }
084    
085        /**
086         * Closes both streams. 
087         * @throws IOException if an I/O error occurs
088         */
089        public void close() throws IOException {
090            super.close();
091            this.branch.close();
092        }
093    
094    }