/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You under the Apache License, Version 2.0

  * (the "License"); you may not use this file except in compliance with

  * the License.  You may obtain a copy of the License at

  * 

  *      http://www.apache.org/licenses/LICENSE-2.0

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.io.output;

 import java.io.IOException;

 import java.io.OutputStream;

 /**

  * Classic splitter of OutputStream. Named after the unix 'tee' 

  * command. It allows a stream to be branched off so there 

  * are now two streams.

  *

  * @version $Id: TeeOutputStream.java 1415850 2012-11-30 20:51:39Z ggregory $

  */

 public class TeeOutputStream extends ProxyOutputStream {

     /** the second OutputStream to write to */

     protected OutputStream branch;

     /**

      * Constructs a TeeOutputStream.

      * @param out the main OutputStream

      * @param branch the second OutputStream

      */

     public TeeOutputStream(final OutputStream out, final OutputStream branch) {

         super(out);

         this.branch = branch;

     }

     /**

      * Write the bytes to both streams.

      * @param b the bytes to write

      * @throws IOException if an I/O error occurs

      */

     @Override

     public synchronized void write(final byte[] b) throws IOException {

         super.write(b);

         this.branch.write(b);

     }

     /**

      * Write the specified bytes to both streams.

      * @param b the bytes to write

      * @param off The start offset

      * @param len The number of bytes to write

      * @throws IOException if an I/O error occurs

      */

     @Override

     public synchronized void write(final byte[] b, final int off, final int len) throws IOException {

         super.write(b, off, len);

         this.branch.write(b, off, len);

     }

     /**

      * Write a byte to both streams.

      * @param b the byte to write

      * @throws IOException if an I/O error occurs

      */

     @Override

     public synchronized void write(final int b) throws IOException {

         super.write(b);

         this.branch.write(b);

     }

     /**

      * Flushes both streams.

      * @throws IOException if an I/O error occurs

      */

     @Override

     public void flush() throws IOException {

         super.flush();

         this.branch.flush();

     }

     /**

      * Closes both output streams.

      * 

      * If closing the main output stream throws an exception, attempt to close the branch output stream.

      * 

      * If closing the main and branch output streams both throw exceptions, which exceptions is thrown by this method is

      * currently unspecified and subject to change.

      * 

      * @throws IOException

      *             if an I/O error occurs

      */

     @Override

     public void close() throws IOException {

         try {

             super.close();

         } finally {

             this.branch.close();

         }

     }

 }