buffersize.java

本源码给出了在jbuilder下实现串口通信,并且如何使用

/*
 * @(#)BufferSize.java	1.1 98/06/02 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.
 */

package samples.ParallelBlackBox;

import javax.comm.*;

import java.awt.*;
import java.awt.event.*;

public class BufferSize
    extends Panel implements MouseListener, ActionListener {
  private int value,
  defaultValue;
  private Label label;
  private TextField data;
  private ParallelPort port = null;
  private boolean inputBuffer;

  public BufferSize(int size,
                    ParallelPort port,
                    boolean inputBuffer) {
    super();

    this.setPort(port);

    this.inputBuffer = inputBuffer;

    this.setLayout(new BorderLayout());

    this.label = new Label("Buffer Size");
    this.label.addMouseListener(this);
    this.add("West", this.label);

    this.data = new TextField(new Integer(defaultValue).toString(),
                              size);
    this.data.addActionListener(this);
    this.add("East", this.data);

    this.showValue();

    this.defaultValue = this.value;
  }

  public void setPort(ParallelPort port) {
    this.port = port;
  }

  public int getValue() {
    if (this.port != null) {
      /*
       *  Get the buffer size.
       */

      if (inputBuffer) {
        this.value = port.getInputBufferSize();
      }

      else {
        this.value = port.getOutputBufferSize();
      }

      return this.value;
    }

    else {
      return (0);
    }
  }

  public void showValue() {
    this.data.setText(new Integer(this.getValue()).toString());
  }

  public void setValue(int val) {
    if (this.port != null) {
      /*
       *  Set the new buffer size.
       */

      if (inputBuffer) {
        port.setInputBufferSize(val);
      }

      else {
        port.setOutputBufferSize(val);
      }
    }

    this.showValue();
  }

  public void setDefaultValue(int val) {
    this.defaultValue = val;
  }

  public void actionPerformed(ActionEvent e) {
    String s = e.getActionCommand();

    try {
      Integer newValue = new Integer(s);

      this.setValue(newValue.intValue());
    }

    catch (NumberFormatException ex) {
      System.out.println("Bad value = "
                         + e.getActionCommand());

      this.showValue();
    }
  }

  public void mouseClicked(MouseEvent e) {
  }

  public void mouseEntered(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mousePressed(MouseEvent e) {
    this.setValue(this.defaultValue);
  }

  public void mouseReleased(MouseEvent e) {
  }
}