// serial comms library
// does port identification
// opens channel at 1200 baud for talking to serial port.
//
// Fred Martin / computer science / UML
// Tue Sep 24 12:29:23 2002
// updated Sat Oct  4 14:00:53 2003 
//   made close method public

import java.io.*;
import java.util.*;
import javax.comm.*;

public class Serial {

	private SerialPort sp;	
    private String portName;
	private String[] portList;
	private OutputStream output;
	private InputStream input;

	static final private boolean DEBUG = false;

	// just try to open the requested port.  if fail, get any...
	// should save time since not iterating thru whole list.
	public Serial(String desiredSP) {
		CommPortIdentifier portID;

		try {
			portID= CommPortIdentifier.getPortIdentifier(desiredSP);
			sp = (SerialPort)(portID.open("Serial", 50));
			portName = desiredSP;
			String[] ports = new String[1];
			ports[0] = desiredSP;
			portList = ports;
			portInit(); // init w/o opening port
		} catch (Exception e) {
			System.out.println("could not open requested port " + desiredSP);
			loadPortList();

			if (portList.length > 0) {
				portName = portList[0];  // choose 1st one initially
				//System.out.println("new Serial with SP " + portName);
				init();
			} else {
				System.out.println("no SPs available!");
				portName = "<no ports available>";
			}
			System.out.println("opened port " + getPortName() + " instead.");
		}

	}
			
			
	public Serial()	{
		loadPortList();
		
		if (portList.length > 0) {
			portName = portList[0];  // choose 1st one initially
	        //System.out.println("new Serial with SP " + portName);
		    init();
		} else {
			System.out.println("no SPs available!");
			portName = "<no ports available>";
		}
	}

	protected void finalize()
	{
		try {
			output.flush();
		} catch (Exception e) {
			e.printStackTrace();
		}
		close();
	}

	private void init() {		
		try {
			sp= (SerialPort)(CommPortIdentifier.getPortIdentifier(portName).open("Serial",50));
			//System.out.println("created SerialPort object");
			portInit();
		}
		catch (Exception ioe) {
			ioe.printStackTrace();
		}

	}

	// sp object must already exist
	private void portInit() {
		try {
			sp.setSerialPortParams(1200, sp.DATABITS_8, sp.STOPBITS_1, sp.PARITY_NONE);
			//System.out.println("setSerialPortParams");
			sp.enableReceiveTimeout(15);
			//System.out.println("enableReceiveTimeout");
			output=sp.getOutputStream();
			//System.out.println("getOutputStream");
			input=sp.getInputStream();
			//System.out.println("getInputStream");
		}
		catch (Exception ioe) {
			ioe.printStackTrace();
		}

	}


	public void setPortName(String name)
	{
		close();
		portName = name;
		init();
	}
	
	public String getPortName()
	{
		return portName;
	}
	
	public void close() {
		try {
			sp.close();
		}
		catch (Exception ioe) {
			System.out.println(ioe);
		}
	}

	public void flush() {
		try {
			output.flush();
		}
		catch (Exception ioe) {
			System.out.println(ioe);
		}
	}

	public int get() {
		int b= -1;

		try {
			b=input.read();
		} catch (Exception ioe) {
			ioe.printStackTrace();
		}

		//		System.out.println("get is returning " + b);

		return b;
	}
	
	public void put(int b) throws IOException {
		output.write(b);
	}

	public void put(byte[] buf) throws IOException {
		output.write(buf);
	}
	
	private void loadPortList()
	{
		Enumeration sportsAll = null;
		Vector v = new Vector();
		SerialPort sp;
		CommPortIdentifier portID;
		String currString;

		try {
			sportsAll= CommPortIdentifier.getPortIdentifiers();
		} catch (Exception e) {
			System.out.println(e);
		}
		
		while (sportsAll.hasMoreElements()) {
			try {
				currString=((CommPortIdentifier)(sportsAll.nextElement())).getName();
				//				System.out.println("currString is " + currString);
				portID= CommPortIdentifier.getPortIdentifier(currString);
				if (portID.getPortType() == portID.PORT_SERIAL) {
					sp=(SerialPort)(portID.open("Serial", 50));
					sp.close();
					v.addElement(currString);
				}
			} catch (Exception e) {
			}
		}
     
		portList = new String[v.size()];
		v.copyInto(portList);
    }

    public String[] portsAvailable() {
		if (portList.length>0) {
			return portList;
		} else {
			String[] result= new String[1];
			result[0]="<no ports found>";
			return result;
		}
	}

}

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