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  1. /*
  2.  * Copyright (c) 2010, Manuel Mausz. All rights reserved.
  3.  *
  4.  * Redistribution and use in source and binary forms, with or without
  5.  * modification, are permitted provided that the following conditions
  6.  * are met:
  7.  *
  8.  *   - Redistributions of source code must retain the above copyright
  9.  *     notice, this list of conditions and the following disclaimer.
  10.  *
  11.  *   - Redistributions in binary form must reproduce the above copyright
  12.  *     notice, this list of conditions and the following disclaimer in the
  13.  *     documentation and/or other materials provided with the distribution.
  14.  *
  15.  *   - The names of the authors may not be used to endorse or promote products
  16.  *     derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  19.  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20.  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  21.  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  22.  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  23.  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  24.  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  25.  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  26.  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27.  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28.  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. import java.io.InputStreamReader;
  32. import java.io.BufferedReader;
  33. import java.io.InputStream;
  34. import java.io.IOException;
  35.  
  36. /*
  37.  * Allows you to easily setup a interactive console application
  38.  * Register commands in ctor and invoke run() afterwards
  39.  * Reads line-based
  40.  *
  41.  * @author Manuel Mausz (0728348)
  42.  */
  43. public abstract class CommandInteractive
  44. {
  45.   private boolean stop = false;
  46.   private boolean onecommand = false;
  47.   private boolean ignoreempty = true;
  48.   protected CommandHandler cmdHandler;
  49.  
  50.   /*--------------------------------------------------------------------------*/
  51.  
  52.   public CommandInteractive()
  53.   {
  54.     cmdHandler = new CommandHandler();
  55.   }
  56.  
  57.   /*--------------------------------------------------------------------------*/
  58.  
  59.   public void setOneCommandMode(boolean mode)
  60.   {
  61.     onecommand = mode;
  62.   }
  63.  
  64.   /*--------------------------------------------------------------------------*/
  65.  
  66.   public void setIgnoreEmptyMode(boolean mode)
  67.   {
  68.     ignoreempty = mode;
  69.   }
  70.  
  71.   /*--------------------------------------------------------------------------*/
  72.  
  73.   public void stop()
  74.   {
  75.     stop = true;
  76.   }
  77.  
  78.   /*--------------------------------------------------------------------------*/
  79.  
  80.   public void printPrompt()
  81.   {}
  82.  
  83.   /*--------------------------------------------------------------------------*/
  84.  
  85.   public void run(InputStream in)
  86.     throws IOException
  87.   {
  88.     BufferedReader stream = new BufferedReader(new InputStreamReader(in));
  89.     String input;
  90.  
  91.     printPrompt();
  92.     while(!stop && (input = stream.readLine()) != null)
  93.     {
  94.       if (!ignoreempty || input.length() > 0)
  95.       {
  96.         String[] pieces = input.split("\\s+");
  97.         String[] args = new String[pieces.length - 1];
  98.         System.arraycopy(pieces, 1, args, 0, pieces.length - 1);
  99.         cmdHandler.call(pieces[0], args);
  100.       }
  101.  
  102.       if (onecommand)
  103.         stop();
  104.  
  105.       if (!stop)
  106.         printPrompt();
  107.     }
  108.   }
  109. }
  110.