package org.litesoft.p2pchat;

import java.io.*;
import java.util.*;

// Copyright Status:
//
// All Software available from LiteSoft.org (including this file) is
// hereby released into the public domain.
//
// It is free!  As in, you may use it freely in both commercial and
// non-commercial applications, bundle it with your software
// distribution, include it on a CD-ROM, list the source code in a book,
// mirror the documentation at your own web site, or use it in any other
// way you see fit.
//
// NO Warranty!
//
// All software is provided "as is".
//
// There is ABSOLUTELY NO WARRANTY OF ANY KIND: not for the design, fitness
// (for a particular purpose), level of errors (or lack thereof), or
// applicability of this software.  The entire risk as to the quality
// and performance of this software is with you.  Should this software
// prove defective, you assume the cost of all necessary servicing, repair
// or correction.
//
// In no event unless required by applicable law or agreed to in writing
// will any party who created or may modify and/or redistribute this
// software, be liable to you for damages, including any general,
// special, incidental or consequential damages arising out of the use or
// inability to use this software (including but not limited to loss of
// data or data being rendered inaccurate or losses sustained by you or
// third parties or a failure of this software to operate with any
// other programs), even if such holder or other party has been advised
// of the possibility of such damages.
//
// NOTE: Should you discover a bug, have a recogmendation for a change, wish
// to submit modifications, or wish to add new classes/functionality,
// please email them to:
//
//        changes@litesoft.org
//

/**
 * @author  Devin Smith and George Smith
 * @version 0.3 02/02/02 Added IllegalArgument.ifNull for all public params that may not be null
 * @version 0.2 01/28/02 Refactored and Added Licence
 * @version 0.1 12/27/01 Initial Version
 */
@SuppressWarnings("unchecked")
public class PeerWriter extends Thread {
  private Vector zLines = new Vector();
  private boolean isOpen = true;
  private BufferedWriter zWriter;
  private long pingInterval = 15L*60L*1000L;

  public PeerWriter(OutputStream pOs) {
    IllegalArgument.ifNull("Os", pOs);
    zWriter = new BufferedWriter(new OutputStreamWriter(pOs));
    start();
  }

  public synchronized void writeLine(String pMessage) {
    IllegalArgument.ifNull("Message", pMessage);
    if (isOpen) {
      zLines.addElement(pMessage);
    }
    notifyAll();
  }

  public synchronized void close() {
    isOpen = false;
    notifyAll();
  }

  public synchronized boolean isOpen() {
    return isOpen;
  }

  private synchronized String getLine() {
    while (isOpen && zLines.isEmpty()) {
      try {
        wait(pingInterval);
      }
      catch (InterruptedException e) {
      }
    }
    String message = isOpen ? "" : null;
    if (isOpen && zLines.size() > 0) {
      message = (String) zLines.elementAt(0);
      zLines.removeElementAt(0);
    }
    return message;
  }

  public void run() {
    String line;
    try {
      while (null != (line = getLine())) {
        zWriter.write(line);
        zWriter.newLine();
        zWriter.flush();
      }
      zWriter.write("BYE");
      zWriter.newLine();
      zWriter.flush();
    }
    catch (IOException e) {
      // Presume socket has been closed.  Fail silently and stop thread
    }
    try {
      isOpen = false;
      zWriter.close();
    }
    catch (IOException ignore) {
    }
  }
}
