1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package com.oracle.java.testlibrary;
  25 
  26 import java.io.OutputStream;
  27 import java.io.InputStream;
  28 import java.io.IOException;
  29 
  30 public final class StreamPumper implements Runnable {
  31 
  32   private static final int BUF_SIZE = 256;
  33 
  34   private final OutputStream out;
  35   private final InputStream in;
  36 
  37   /**
  38    * Create a StreamPumper that reads from in and writes to out.
  39    *
  40    * @param in The stream to read from.
  41    * @param out The stream to write to.
  42    */
  43   public StreamPumper(InputStream in, OutputStream out) {
  44     this.in = in;
  45     this.out = out;
  46   }
  47 
  48   /**
  49    * Implements Thread.run(). Continuously read from <code>in</code> and write
  50    * to <code>out</code> until <code>in</code> has reached end of stream. Abort
  51    * on interruption. Abort on IOExceptions.
  52    */
  53   @Override
  54   public void run() {
  55     int length;
  56     InputStream localIn = in;
  57     OutputStream localOut = out;
  58     byte[] buffer = new byte[BUF_SIZE];
  59 
  60     try {
  61       while (!Thread.interrupted() && (length = localIn.read(buffer)) > 0) {
  62         localOut.write(buffer, 0, length);
  63       }
  64     } catch (IOException e) {
  65       // Just abort if something like this happens.
  66       e.printStackTrace();
  67     } finally {
  68       try {
  69         localOut.flush();
  70         in.close();
  71       } catch (IOException e) {
  72         e.printStackTrace();
  73       }
  74     }
  75   }
  76 }