gpsreader.java

read GPS information from the commport installed in PDA

package Reader;


import java.io.IOException;
import java.io.InputStreamReader;
import javax.microedition.io.*;
import javax.microedition.*;
import java.io.*;





public class GPSReader implements Runnable {
	
	private InputStreamReader reader;
	private Thread runner;
	private RecordBuffer buffer;
	private static final long BREAK = 2000;
	private static final int LINE_DELIMITER = 13;
	private Logger logger;
	private StreamConnection conn = null;
	//private FileConnection conn = null;
	private String com = new String();
	private InputStream is;
	
	public GPSReader(Logger logger, String com) {
		this.logger = logger;
		this.com = com;
		this.buffer = new RecordBuffer();
	}
	
	private synchronized void connect() throws IOException {
	//	conn = (FileConnection) Connector.open(com);
		conn =  (StreamConnection) Connector.open(com);
	//	conn = (StreamConnection) Connector.open(com, Connector.READ);
		reader = new InputStreamReader(conn.openInputStream());
//		System.out.print("OOOOOOOOOOOOO");
	}
/*private synchronized void BuildReader() throws IOException{
		InputStream is;
		String p = new String();
		p = "C:/Users/Jack/Desktop/gps.txt";
		reader =new InputStreamReader(getClass().getResourceAsStream(p));
		//conn = (FileConnection )Connector.open("C://Users//Jack//Desktop//Gps.dat");
		System.out.println(")))))))))");
	//	conn = (StreamConnection)Connector.open("comm:0;baudrate=9000");
//		StringBuffer str = new StringBuffer(); 
	//	reader = new InputStreamReader(conn.openInputStream()); 
		System.out.println(")))))))))");
		System.out.println(")))))))))");
	}*/
	
	
	private synchronized void disconnect() {
		
		try {
			if (reader != null)
				reader.close();
			if (is != null)
				is.close();
		} catch (IOException e) {
		}
		reader = null;
		is = null;
	}
		
//		try {
//			if (reader != null)
//				reader.close();
//			if (conn != null)
//				conn.close();
//		} catch (IOException e) {
//		}
//		reader = null;
//		conn = null;
//	}
	
	public Record getRecord() throws EmptyBufferException {
		return buffer.getRecord();
	}
	
	public synchronized boolean isConnected() {
		return is != null && reader != null;

		//		return conn != null && reader != null;
	}
	
	public void start() {
		if (runner == null) {
			runner = new Thread(this);
			runner.start();
		}
	}
	public void stop() {
		runner = null;
		disconnect();
	}
	
	public void run() {
		int startType = Parser.TYPE_START;
		int type = Parser.TYPE_NA;
		Record record = new Record();

		while (Thread.currentThread() == runner) {
			try {
				if (!isConnected())
					connect();
				//	BuildReader();
				String output = new String();
//				int i = 0;
				int input;
//				int len = (int)conn.getLength();
				while ((input = reader.read()) != LINE_DELIMITER)
					output += (char) input;
				output = output.substring(1, output.length() - 1);
				try {
					type = Parser.parse(output, record);
//					System.out.print("PPPPPPPPPPPPPPP");
					buffer.putRecord(record);
//					str.append((char)input);
				}
				catch (UnsupportedTypeException ue) {
					type = Parser.TYPE_NA;
				}
				catch (ParseException pe) {
					logger.appendString("Parse exception: " + pe.getMessage());
					pe.printStackTrace();
				}

				if (type != Parser.TYPE_NA) {
					if (type == startType) {
						disconnect();
						startType = Parser.TYPE_START;
						record = new Record();
						try {
							Thread.sleep(BREAK);
						} catch (InterruptedException e) {
							logger.appendString(e.getMessage());
						}
					}
					else if (startType == Parser.TYPE_START) {
						startType = type;
					}
				}
			}
			catch (IOException ie) {
				try {
					Thread.sleep(BREAK);
				} catch (InterruptedException e) {
					logger.appendString("IO exception: " + e.getMessage());
				}
				ie.printStackTrace();
			}
		}
	}
	


		
	}