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Java example source code file (FindPanel.java)

This example Java source code file (FindPanel.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

address, addressexception, awt, borderlayout, box, bytearrayoutputstream, document, event, findpanel, gui, jlabel, jpanel, jscrollpane, jtextarea, jtextfield, pointerlocation, printstream, swing, text

The FindPanel.java Java example source code

/*
 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.ui;

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;

import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.utilities.*;

/** Uses {@link sun.jvm.hotspot.utilities.PointerFinder} to provide a
    graphical user interface to the VM's debugging utility "find". */

public class FindPanel extends JPanel {
  // UI widgets we need permanent handles to
  private JTextField addressField;
  private JTextArea  textArea;
  private JLabel statusLabel;

  public FindPanel() {
    super();

    setLayout(new BorderLayout());
    Box hbox = Box.createHorizontalBox();
    hbox.add(new JLabel("Address: "));
    addressField = new JTextField(20);
    hbox.add(addressField);
    statusLabel = new JLabel();
    hbox.add(statusLabel);
    add(hbox, BorderLayout.NORTH);

    JScrollPane scroller = new JScrollPane();
    textArea = new JTextArea();
    textArea.setEditable(false);
    textArea.setLineWrap(true);
    textArea.setWrapStyleWord(true);
    scroller.getViewport().add(textArea);
    add(scroller, BorderLayout.CENTER);

    addressField.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          try {
            Address a = VM.getVM().getDebugger().parseAddress(addressField.getText());
            PointerLocation loc = PointerFinder.find(a);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            loc.printOn(new PrintStream(bos));
            clear();
            textArea.append(bos.toString());
            statusLabel.setText("");
          }
          catch (NumberFormatException ex) {
            statusLabel.setText("<parse error>");
          }
          catch (AddressException ex) {
            statusLabel.setText("<bad address>");
          }
          catch (Exception ex) {
            ex.printStackTrace();
            statusLabel.setText("<error during find>");
          }
        }
      });
  }

  private void clear() {
    Document doc = textArea.getDocument();
    if (doc.getLength() > 0) {
      try {
        doc.remove(0, doc.getLength());
      }
      catch (BadLocationException e) {
      }
    }
  }
}

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