code: /*
   * 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 659817 2008-05-24 13:23:10Z niallp $
   */
  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( OutputStream out, 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(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(byte[] b, int off, 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(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 streams. 
       * @throws IOException if an I/O error occurs
       */
      @Override
      public void close() throws IOException {
          super.close();
          this.branch.close();
      }
  
  }
  