1 /*
   2  * Copyright (c) 2001, 2011, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  * This source code is provided to illustrate the usage of a given feature
  28  * or technique and has been deliberately simplified. Additional steps
  29  * required for a production-quality application, such as security checks,
  30  * input validation and proper error handling, might not be present in
  31  * this sample code.
  32  */
  33 
  34 
  35 package com.sun.tools.example.trace;
  36 
  37 import java.io.*;
  38 
  39 /**
  40  * StreamRedirectThread is a thread which copies it's input to
  41  * it's output and terminates when it completes.
  42  *
  43  * @author Robert Field
  44  */
  45 class StreamRedirectThread extends Thread {
  46 
  47     private final Reader in;
  48     private final Writer out;
  49 
  50     private static final int BUFFER_SIZE = 2048;
  51 
  52     /**
  53      * Set up for copy.
  54      * @param name  Name of the thread
  55      * @param in    Stream to copy from
  56      * @param out   Stream to copy to
  57      */
  58     StreamRedirectThread(String name, InputStream in, OutputStream out) {
  59         super(name);
  60         this.in = new InputStreamReader(in);
  61         this.out = new OutputStreamWriter(out);
  62         setPriority(Thread.MAX_PRIORITY-1);
  63     }
  64 
  65     /**
  66      * Copy.
  67      */
  68     @Override
  69     public void run() {
  70         try {
  71             char[] cbuf = new char[BUFFER_SIZE];
  72             int count;
  73             while ((count = in.read(cbuf, 0, BUFFER_SIZE)) >= 0) {
  74                 out.write(cbuf, 0, count);
  75             }
  76             out.flush();
  77         } catch(IOException exc) {
  78             System.err.println("Child I/O Transfer - " + exc);
  79         }
  80     }
  81 }