Added ability to use this library with a user-defined serial port desriptor.

src/main/java/com/fazecast/jSerialComm/SerialPort.java

@@ -38,7 +38,7 @@ import java.util.Date;
  * This class provides native access to serial ports and devices without requiring external libraries or tools.
  * 
  * @author Will Hedgecock <will.hedgecock@fazecast.com>
- * @version 1.1.1
+ * @version 1.2.0
  * @see java.io.InputStream
  * @see java.io.OutputStream
  */
@@ -169,10 +169,33 @@ public final class SerialPort
 	 * <p>
 	 * All serial port parameters or timeouts can be changed at any time after the port has been opened.
 	 * 
-	 * @return An array of SerialPort objects.
+	 * @return An array of {@link SerialPort} objects.
 	 */
 	static public native SerialPort[] getCommPorts();
 	
+	/**
+	 * Allocates a {@link SerialPort} object corresponding to the user-specified port descriptor.
+	 * <p>
+	 * On Windows machines, this descriptor should be in the form of "COM[*]".<br>
+	 * On Linux machines, the descriptor will look similar to "/dev/tty[*]".
+	 * 
+	 * @param portDescriptor The desired serial port to use with this library.
+	 * @return A SerialPort object.
+	 */
+	static public SerialPort getCommPort(String portDescriptor)
+	{
+		// Correct Windows port descriptor, if needed
+		if (portDescriptor.contains("COM"))
+			portDescriptor = "\\\\.\\" + portDescriptor.substring(portDescriptor.lastIndexOf('\\')+1);
+		
+		// Create SerialPort object
+		SerialPort serialPort = new SerialPort();
+		serialPort.comPort = portDescriptor;
+		serialPort.portString = "User-Specified Port";
+		
+		return serialPort;
+	}
+	
 	// Parity Values
 	static final public int NO_PARITY = 0;
 	static final public int ODD_PARITY = 1;
@@ -302,7 +325,7 @@ public final class SerialPort
 	public final native int writeBytes(byte[] buffer, long bytesToWrite);
 	
 	// Default Constructor
-	public SerialPort() {}
+	private SerialPort() {}
 	
 	/**
 	 * Adds a {@link SerialPortDataListener} to the serial port interface.

src/test/java/com/fazecast/jSerialComm/SerialPortTest.java

@@ -61,10 +61,19 @@ public class SerialPortTest
 		System.out.println("\nAvailable Ports:\n");
 		for (int i = 0; i < ports.length; ++i)
 			System.out.println("   " + ports[i].getSystemPortName() + ": " + ports[i].getDescriptivePortName());
-		System.out.print("\nChoose your desired serial port: ");
+		SerialPort ubxPort;
+		System.out.print("\nChoose your desired serial port or enter -1 to specify a port directly: ");
 		int serialPortChoice = 0;
 		try { serialPortChoice = (new Scanner(System.in)).nextInt(); } catch (Exception e) {}
-		SerialPort ubxPort = ports[serialPortChoice];
+		if (serialPortChoice == -1)
+		{
+			String serialPortDescriptor = "";
+			System.out.print("\nSpecify your desired serial port descriptor: ");
+			try { serialPortDescriptor = (new Scanner(System.in)).nextLine(); } catch (Exception e) {}
+			ubxPort = SerialPort.getCommPort(serialPortDescriptor);
+		}
+		else
+			ubxPort = ports[serialPortChoice];
 		byte[] readBuffer = new byte[2048];
 		
 		System.out.println("\nOpening " + ubxPort.getDescriptivePortName() + ": " + ubxPort.openPort());