Choose a port, any port! : COM Port « Development Class « Java






Choose a port, any port!

 

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Enumeration;
import java.util.HashMap;

import javax.comm.CommPortIdentifier;
import javax.comm.SerialPort;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * Choose a port, any port!
 * 
 * Java Communications is a "standard extention" and must be downloaded and
 * installed separately from the JDK before you can even compile this program.
 * 
 * @author Ian F. Darwin, http://www.darwinsys.com/
 * @version $Id: PortChooser.java,v 1.9 2004/04/11 23:50:40 ian Exp $
 */
public class PortChooser extends JDialog implements ItemListener {
  /** A mapping from names to CommPortIdentifiers. */
  protected HashMap map = new HashMap();

  /** The name of the choice the user made. */
  protected String selectedPortName;

  /** The CommPortIdentifier the user chose. */
  protected CommPortIdentifier selectedPortIdentifier;

  /** The JComboBox for serial ports */
  protected JComboBox serialPortsChoice;

  /** The JComboBox for parallel ports */
  protected JComboBox parallelPortsChoice;

  /** The JComboBox for anything else */
  protected JComboBox other;

  /** The SerialPort object */
  protected SerialPort ttya;

  /** To display the chosen */
  protected JLabel choice;

  /** Padding in the GUI */
  protected final int PAD = 5;

  /**
   * This will be called from either of the JComboBoxen when the user selects
   * any given item.
   */
  public void itemStateChanged(ItemEvent e) {
    // Get the name
    selectedPortName = (String) ((JComboBox) e.getSource())
        .getSelectedItem();
    // Get the given CommPortIdentifier
    selectedPortIdentifier = (CommPortIdentifier) map.get(selectedPortName);
    // Display the name.
    choice.setText(selectedPortName);
  }

  /* The public "getter" to retrieve the chosen port by name. */
  public String getSelectedName() {
    return selectedPortName;
  }

  /* The public "getter" to retrieve the selection by CommPortIdentifier. */
  public CommPortIdentifier getSelectedIdentifier() {
    return selectedPortIdentifier;
  }

  /** A test program to show up this chooser. */
  public static void main(String[] ap) {
    PortChooser c = new PortChooser(null);
    c.setVisible(true); // blocking wait
    System.out.println("You chose " + c.getSelectedName() + " (known by "
        + c.getSelectedIdentifier() + ").");
    System.exit(0);
  }

  /**
   * Construct a PortChooser --make the GUI and populate the ComboBoxes.
   */
  public PortChooser(JFrame parent) {
    super(parent, "Port Chooser", true);

    makeGUI();
    populate();
    finishGUI();
  }

  /**
   * Build the GUI. You can ignore this for now if you have not yet worked
   * through the GUI chapter. Your mileage may vary.
   */
  protected void makeGUI() {
    Container cp = getContentPane();

    JPanel centerPanel = new JPanel();
    cp.add(BorderLayout.CENTER, centerPanel);

    centerPanel.setLayout(new GridLayout(0, 2, PAD, PAD));

    centerPanel.add(new JLabel("Serial Ports", JLabel.RIGHT));
    serialPortsChoice = new JComboBox();
    centerPanel.add(serialPortsChoice);
    serialPortsChoice.setEnabled(false);

    centerPanel.add(new JLabel("Parallel Ports", JLabel.RIGHT));
    parallelPortsChoice = new JComboBox();
    centerPanel.add(parallelPortsChoice);
    parallelPortsChoice.setEnabled(false);

    centerPanel.add(new JLabel("Unknown Ports", JLabel.RIGHT));
    other = new JComboBox();
    centerPanel.add(other);
    other.setEnabled(false);

    centerPanel.add(new JLabel("Your choice:", JLabel.RIGHT));
    centerPanel.add(choice = new JLabel());

    JButton okButton;
    cp.add(BorderLayout.SOUTH, okButton = new JButton("OK"));
    okButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        PortChooser.this.dispose();
      }
    });

  }

  /**
   * Populate the ComboBoxes by asking the Java Communications API what ports
   * it has. Since the initial information comes from a Properties file, it
   * may not exactly reflect your hardware.
   */
  protected void populate() {
    // get list of ports available on this particular computer,
    // by calling static method in CommPortIdentifier.
    Enumeration pList = CommPortIdentifier.getPortIdentifiers();

    // Process the list, putting serial and parallel into ComboBoxes
    while (pList.hasMoreElements()) {
      CommPortIdentifier cpi = (CommPortIdentifier) pList.nextElement();
      // System.out.println("Port " + cpi.getName());
      map.put(cpi.getName(), cpi);
      if (cpi.getPortType() == CommPortIdentifier.PORT_SERIAL) {
        serialPortsChoice.setEnabled(true);
        serialPortsChoice.addItem(cpi.getName());
      } else if (cpi.getPortType() == CommPortIdentifier.PORT_PARALLEL) {
        parallelPortsChoice.setEnabled(true);
        parallelPortsChoice.addItem(cpi.getName());
      } else {
        other.setEnabled(true);
        other.addItem(cpi.getName());
      }
    }
    serialPortsChoice.setSelectedIndex(-1);
    parallelPortsChoice.setSelectedIndex(-1);
  }

  protected void finishGUI() {
    serialPortsChoice.addItemListener(this);
    parallelPortsChoice.addItemListener(this);
    other.addItemListener(this);
    pack();
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
}



           
         
  








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