/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.console;

import java.io.*;

import org.osgi.framework.*;
import org.knopflerfish.service.console.*;

/**
 * Implementation of the service interface ConsoleService.
 *
 * @see org.knopflerfish.service.console.ConsoleService
 * @author  Jan Stein
 * @version $Revision: 1.1.1.1 $
 */
public class ReadThread extends Thread {

  Reader in;
  Session session;
  Pipe pipe;
  boolean open = true;
  char escapeChar = '\026'; // default CTRL-V 
  String interruptString = "\003"; // default CTRL-C 

  public ReadThread(Reader in, Session session) throws IOException {
    super("Reader thread " + session.getName());
    this.in = in;
    this.session = session;
    pipe = new Pipe();
  }

  /**
   * 
   * 
   */
  public Reader getReader() {
    return pipe.getReader();
  }


  //
  // Thread main
  //

  /**
   * Run
   * 
   * @param commands String with command to run
   * @return Result of commands
   */
  public void run() {
    boolean escape = false;
    int ipos = 0;
    int c;
    while (open) {
      try {
	c = in.read();
      } catch (InterruptedIOException ignore) {
	// If we are interrupted, we check open flag and try to read again.
	continue;
      } catch (IOException ignore) {
	// Treat every IO problem as EOF.
	c = -1;
      }
      if (c == -1) {
	close();
      } else if (!escape && c == escapeChar) {
	escape = true;
	ipos = 0;
      } else if (!escape && c == interruptString.charAt(ipos)) {
	if (++ipos == interruptString.length()) {
	  ipos = 0;
	  session.abortCommand();
	}
      } else {
	if (ipos > 0) {
	  pipe.write(interruptString, 0, ipos);
	  ipos = 0;
	}
	pipe.write(c);
	escape = false;
      }
    }
    pipe.close();
  }

  /**
   * Close this thread
   */
  public void close() {
    open = false;
    this.interrupt();
  }
}