parallelportdisplay.java

这是我自己写的,请各位高手看一下!!是关于串口方面的编程,用java

/*
 * @(#)ParallelPortDisplay.java	1.4 98/10/20 SMI
 *
 * Author: Tom Corson
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license 
 * to use, modify and redistribute this software in source and binary
 * code form, provided that i) this copyright notice and license appear
 * on all copies of the software; and ii) Licensee does not utilize the
 * software in a manner which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind.
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE
 * SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS
 * BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
 * HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING
 * OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control
 * of aircraft, air traffic, aircraft navigation or aircraft
 * communications; or in the design, construction, operation or
 * maintenance of any nuclear facility. Licensee represents and
 * warrants that it will not use or redistribute the Software for such
 * purposes.
 */

import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

import java.util.TooManyListenersException;

import java.awt.Panel;
import java.awt.Label;
import java.awt.TextArea;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Color;

import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

import javax.comm.CommPortIdentifier;
import javax.comm.CommPortOwnershipListener;
import javax.comm.ParallelPort;
import javax.comm.ParallelPortEvent;
import javax.comm.ParallelPortEventListener;
import javax.comm.PortInUseException;

public class ParallelPortDisplay extends Panel implements ParallelPortEventListener, MouseListener, CommPortOwnershipListener
{
	protected CommPortIdentifier	portID;
	protected ParallelPort		port = null;
    	protected InputStream 		in;
    	protected OutputStream 		out,
					outSave;
	protected boolean		lineMonitor,
					open = false;
	
	private int		rcvDelay;
	private Thread		rcvThread = null;
	private ParallelBlackBox	owner;
	private boolean		threadRcv,
				friendly,
				waiting = false;

	Panel			display,
				textPanel;
	Label			portName = null;
	LPTMode			mode;
	CtlSigDisplay		ctlSigs;
	Receiver		receiver;
	Transmitter		transmitter;


	public ParallelPortDisplay(CommPortIdentifier	portID,
				 boolean		threadRcv,
				 boolean		friendly,
				 int			rcvDelay,
				 ParallelBlackBox		owner)
	throws PortInUseException
	{
		super();

		this.setLayout(new BorderLayout());

		this.owner = owner;

		this.lineMonitor = false;

		this.outSave = null;

		this.portID = portID;

		this.threadRcv = threadRcv;

		this.friendly = friendly;

		this.rcvDelay = rcvDelay;
	
		this.openPBBPort();
	}

	private boolean openPBBPort() throws PortInUseException
	{
		/*
		 *  If we are already open, do a close first.
		 */

		if (this.open)
		{
			this.closePBBPort();
		}

		/*
		 *  Register an ownership listener so we can 
		 *  manage the port. 
		 */

		this.portID.addPortOwnershipListener(this);

		/*
		 *  Try to open the port
		 */

		try
		{
			port = (ParallelPort) 
					portID.open("ParallelBlackBox", 
							2000);

			if (port == null)
			{
				System.out.println("Error opening port "
						  + portID.getName());
	
				return false;
			}
	
			else
			{
				this.open = true;
				this.waiting = false;

				if (portName != null)
				{
					portName.setForeground(Color.green);
				}
			}
	
			/*
			 *  Get the input stream
			 */
	
			try
			{
				in = this.port.getInputStream();
			}
	
			catch (IOException e)
			{
				System.out.println("Cannot open input stream");
			}
	
			/*
			 *  Get the output stream
			 */
	
			try
			{
				out = this.port.getOutputStream();
			}
	
			catch (IOException e)
			{
				System.out.println("Cannot open output stream");
			}

			/*
			 *  Create the panel (if needed)
			 */
	
			this.createPanel();

			this.showValues();

			/*
			 *  Setup an event listener for the port
			 */
			try {
			    port.addEventListener(this);
			} catch (TooManyListenersException tmle) {
			    tmle.printStackTrace();
			}
			/*
			 *  These are the events we want to know about
			 */
	
			port.notifyOnBuffer(true);
			port.notifyOnError(true);

			/*
			 *  Create the receiver thread
			 */

			if (this.threadRcv && (rcvThread == null))
			{
				rcvThread = new Thread(this.receiver, 
							"Rcv "
						        + port.getName());
	
				rcvThread.start();
			}
	
			else
			{
				rcvThread = null;
			}
		}

		catch (PortInUseException e)
		{
			System.out.println("Queueing open for "
					  + portID.getName()
					  + ": port in use by "
				  	  + e.currentOwner);

			if (portName != null)
			{
				portName.setForeground(Color.yellow);
			}

			this.waiting = true;

//			throw(e);
		}

		return true;
	}

	public void closePBBPort()
	{
		if (this.open)
		{
			System.out.println("Closing " + this.port.getName());

			this.portName.setForeground(Color.red);

			this.open = false;

			/*
			 *  Stop transmitting
			 */
	
			this.transmitter.stopTransmit();

			/*
			 *  Stop receiving
			 */
	
			if (this.rcvThread != null)
			{
				this.rcvThread.interrupt();

				this.rcvThread = null;
			}

			/*
			 *  Remove the event listener for the port
			 */
	
			this.port.removeEventListener();
	
			/*
			 *  Remove the ownership event listener
			 */

			this.portID.removePortOwnershipListener(this);

			/*
			 *  Close the port
			 */

			this.port.close();

			this.port = null;


			ctlSigs.setPort(this.port);

			receiver.setPort(this.port);

			transmitter.setPort(this.port);

			transmitter.clearValues();
			receiver.clearValues();
			ctlSigs.clearValues();
			ctlSigs.clearErrorValues();

			this.showValues();
		}
	}

	public ParallelPort getPort()
	{
		return(this.open ? this.port : null);
	}

	private OutputStream getOutputStream()
	{
		return(this.out);
	}

	private void setOutputStream(OutputStream	newout)
	{
		this.outSave = getOutputStream();

		this.out = newout;
	}

	public void setLineMonitor(ParallelPortDisplay	other,
				   boolean		value)
	{
		/*
		 *  To make a line monitor, we simply take two ports
		 *  and interchange their output streams!
		 */

		this.lineMonitor = value;
		other.lineMonitor = value;

		if (this.lineMonitor)
		{
			this.setOutputStream(other.getOutputStream());

			other.setOutputStream(this.outSave);
		}

		else
		{
			other.setOutputStream(this.getOutputStream());

			this.setOutputStream(this.outSave);
		}
	}

	private void createPanel()
	{
		/*
		 *  If this labels exists, we have already been created,
		 *  so just reset the correct port.
		 */

		if (portName != null)
		{
			ctlSigs.setPort(this.port);

			receiver.setPort(this.port);

			transmitter.setPort(this.port);
		}

		else
		{
			/*
			 *  Create the User Interface objects
			 */
	
			display = new Panel();
			display.setLayout(new FlowLayout());
	
			portName = new Label(portID.getName());
	
			if (this.open)
			{
				portName.setForeground(Color.green);
			}
	
			else if (this.waiting)
			{
				portName.setForeground(Color.yellow);
			}
	
			else
			{
				portName.setForeground(Color.red);
			}
	
			portName.addMouseListener(this);
			display.add(portName);
	
			mode = new LPTMode(this);
			display.add(mode);
	
			this.add("North", display);
	
	
			ctlSigs = new CtlSigDisplay(port);
	
			this.add("South", ctlSigs);
	
	
			textPanel = new Panel();
			textPanel.setLayout(new BorderLayout());
	
			receiver = new Receiver(this, 6, 40, this.rcvDelay);
	
			textPanel.add("East", receiver);
	
			transmitter = new Transmitter(this, 6, 40);
	
			textPanel.add("West", transmitter);
	
			this.add("Center", textPanel);
	
			owner.addPanel(this);
		}
	}

	protected void showValues()
	{
		mode.showValue();

		transmitter.showValues();
		receiver.showValues();
		ctlSigs.showValues();
		ctlSigs.showErrorValues();
	}

	/*
	 *	Handler for all parallel port events
	 */

	public void parallelEvent(ParallelPortEvent	ev)
	{
		if (this.port == null)
		{
			System.out.println(port.getName()
					 + "got parallel event on a closed port");

			return;
		}

		switch(ev.getEventType())
		{
		case ParallelPortEvent.PAR_EV_ERROR:

			this.ctlSigs.showErrorValues();
			break;
/*
		case ParallelPortEvent.DATA_AVAIL:

			this.ctlSigs.DA = true;
			this.ctlSigs.showErrorValues();

			if (rcvThread != null)
			{
				synchronized (receiver) {
					receiver.notify();
				}
			}

			else if (threadRcv)
			{
				System.out.println(port.getName()
						 + "Receive thread has died!");

				rcvThread = new Thread(this.receiver, 
						       "Rcv "
						       + port.getName());

				rcvThread.start();
			}

			else
			{
				this.receiver.readData();
			}

			break;
*/
		case ParallelPortEvent.PAR_EV_BUFFER:

			this.ctlSigs.BE = true;
			this.ctlSigs.showErrorValues();

			break;
		}
	}


	/*
	 *	Handler to open/close port
	 */

	public void mouseClicked(MouseEvent e)
	{
	}

	public void mouseEntered(MouseEvent e)
	{
	}

	public void mouseExited(MouseEvent e)
	{
	}

	public void mousePressed(MouseEvent e)
	{
//		this.showValues();

		if (this.open)
		{
			this.closePBBPort();
		}

		else
		{
			try
			{
				openPBBPort();
			}

			catch (PortInUseException ex)
			{
				System.out.println(portID.getName()
						   + " is in use by "
						   + ex.currentOwner);
	
			}
		}
	}

	public void mouseReleased(MouseEvent e)
	{
	}

	/*
	 *	Handler for port ownership events.
	 */

	public void ownershipChange(int type)
	{
		switch (type)
		{
		case CommPortOwnershipListener.PORT_UNOWNED:

			System.out.println(portID.getName()
					   + ": PORT_UNOWNED");

			if (this.waiting)
			{
				/*
				 *  Try to open the port
				 */
	
				try
				{
					openPBBPort();
				}
	
				catch (PortInUseException e)
				{
					System.out.println(portID.getName()
							   + " s/b free but is in use by "
							   + e.currentOwner);
				}
			}

			break;
			
		case CommPortOwnershipListener.PORT_OWNED:

			System.out.println(portID.getName() + ": PORT_OWNED");

			break;
			
		case CommPortOwnershipListener.PORT_OWNERSHIP_REQUESTED:

			System.out.println(portID.getName()
					   + ": PORT_OWNERSHIP_REQUESTED");

			if (this.friendly && this.open)
			{
				/*
				 *  Give up the port
				 */
	
				this.closePBBPort();
			}

			break;

		}
	}
}