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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.
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/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see .
 */

/*
 *    LogPanel.java
 *    Copyright (C) 1999-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui;

import weka.core.Utils;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * This panel allows log and status messages to be posted. Log messages appear
 * in a scrollable text area, and status messages appear as one-line transient
 * messages.
 *
 * @author Len Trigg ([email protected])
 * @version $Revision: 14493 $
 */
public class LogPanel extends JPanel implements Logger, TaskLogger {

  /** for serialization */
  private static final long serialVersionUID = -4072464549112439484L;

  /** Displays the current status */
  protected JLabel m_StatusLab = new JLabel("OK");

  /** Displays the log messages */
  protected JTextArea m_LogText = new JTextArea(4, 20);

  /** The button for viewing the log */
  protected JButton m_logButton = new JButton("Log");

  /** An indicator for whether text has been output yet */
  protected boolean m_First = true;

  /** The panel for monitoring the number of running tasks (if supplied) */
  protected WekaTaskMonitor m_TaskMonitor = null;

  /**
   * Creates the log panel with no task monitor and the log always visible.
   */
  public LogPanel() {

    this(null, false, false, true);
  }

  /**
   * Creates the log panel with a task monitor, where the log is hidden.
   *
   * @param tm the task monitor, or null for none
   */
  public LogPanel(WekaTaskMonitor tm) {

    this(tm, true, false, true);
  }

  /**
   * Creates the log panel, possibly with task monitor, where the log is
   * optionally hidden.
   *
   * @param tm the task monitor, or null for none
   * @param logHidden true if the log should be hidden and acessible via a
   *          button, or false if the log should always be visible.
   */
  public LogPanel(WekaTaskMonitor tm, boolean logHidden) {
    this(tm, logHidden, false, true);
  }

  /**
   * Creates the log panel, possibly with task monitor, where the either the log
   * is optionally hidden or the status (having both hidden is not allowed).
   * 
   *
   * @param tm the task monitor, or null for none
   * @param logHidden true if the log should be hidden and acessible via a
   *          button, or false if the log should always be visible.
   * @param statusHidden true if the status bar should be hidden (i.e.
   * @param titledBorder true if the log should have a title you only want the
   *          log part).
   */
  public LogPanel(WekaTaskMonitor tm, boolean logHidden, boolean statusHidden,
    boolean titledBorder) {

    m_TaskMonitor = tm;
    m_LogText.setEditable(false);
    m_LogText.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
    m_StatusLab.setBorder(BorderFactory.createCompoundBorder(
      BorderFactory.createTitledBorder("Status"),
      BorderFactory.createEmptyBorder(0, 5, 5, 5)));

    // create scrolling log
    final JScrollPane js = new JScrollPane(m_LogText);
    js.getViewport().addChangeListener(new ChangeListener() {
      private int lastHeight;

      public void stateChanged(ChangeEvent e) {
        JViewport vp = (JViewport) e.getSource();
        int h = vp.getViewSize().height;
        if (h != lastHeight) { // i.e. an addition not just a user scrolling
          lastHeight = h;
          int x = h - vp.getExtentSize().height;
          vp.setViewPosition(new Point(0, x));
        }
      }
    });

    if (logHidden) {

      // create log window
      final JFrame jf = Utils.getWekaJFrame("Log", this);
      jf.addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          jf.setVisible(false);
        }
      });
      jf.getContentPane().setLayout(new BorderLayout());
      jf.getContentPane().add(js, BorderLayout.CENTER);
      jf.pack();
      jf.setSize(800, 600);

      // display log window on request
      m_logButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          Window windowAncestor = SwingUtilities.getWindowAncestor(LogPanel.this);
          if (windowAncestor instanceof Frame) {
            jf.setIconImage(((Frame) windowAncestor).getIconImage());
          }
          jf.setLocationRelativeTo(LogPanel.this);
          jf.setVisible(true);
        }
      });

      // do layout
      setLayout(new BorderLayout());
      JPanel logButPanel = new JPanel();
      logButPanel.setLayout(new BorderLayout());
      logButPanel.setBorder(BorderFactory.createEmptyBorder(10, 5, 10, 5));
      logButPanel.add(m_logButton, BorderLayout.CENTER);
      JPanel p1 = new JPanel();
      p1.setLayout(new BorderLayout());
      p1.add(m_StatusLab, BorderLayout.CENTER);
      p1.add(logButPanel, BorderLayout.EAST);

      if (tm == null) {
        add(p1, BorderLayout.SOUTH);
      } else {
        JPanel p2 = new JPanel();
        p2.setLayout(new BorderLayout());
        p2.add(p1, BorderLayout.CENTER);
        p2.add((java.awt.Component) m_TaskMonitor, BorderLayout.EAST);
        add(p2, BorderLayout.SOUTH);
      }
    } else {
      // log always visible

      JPanel p1 = new JPanel();
      if (titledBorder) {
        p1.setBorder(BorderFactory.createTitledBorder("Log"));
      }
      p1.setLayout(new BorderLayout());
      p1.add(js, BorderLayout.CENTER);
      setLayout(new BorderLayout());
      add(p1, BorderLayout.CENTER);

      if (tm == null) {
        if (!statusHidden) {
          add(m_StatusLab, BorderLayout.SOUTH);
        }
      } else {
        if (!statusHidden) {
          JPanel p2 = new JPanel();
          p2.setLayout(new BorderLayout());
          p2.add(m_StatusLab, BorderLayout.CENTER);
          p2.add((java.awt.Component) m_TaskMonitor, BorderLayout.EAST);
          add(p2, BorderLayout.SOUTH);
        }
      }
    }
    addPopup();
  }

  /**
   * Set the size of the font used in the log message area. <= 0 will use the
   * default for JTextArea.
   *
   * @param size the size of the font to use in the log message area
   */
  public void setLoggingFontSize(int size) {
    if (size > 0) {
      m_LogText.setFont(new Font(null, Font.PLAIN, size));
    } else {
      Font temp = new JTextArea().getFont();
      m_LogText.setFont(temp);
    }
  }

  /**
   * adds thousand's-separators to the number
   * 
   * @param l the number to print
   * @return the number as string with separators
   */
  private String printLong(long l) {
    String result;
    String str;
    int i;
    int count;

    str = Long.toString(l);
    result = "";
    count = 0;

    for (i = str.length() - 1; i >= 0; i--) {
      count++;
      result = str.charAt(i) + result;
      if ((count == 3) && (i > 0)) {
        result = "," + result;
        count = 0;
      }
    }

    return result;
  }

  /**
   * Add a popup menu for displaying the amount of free memory and running the
   * garbage collector
   */
  private void addPopup() {
    addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        if (((e.getModifiers() & InputEvent.BUTTON1_MASK) != InputEvent.BUTTON1_MASK)
          || e.isAltDown()) {
          JPopupMenu gcMenu = new JPopupMenu();
          JMenuItem availMem = new JMenuItem("Memory information");
          availMem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ee) {
              System.gc();
              Runtime currR = Runtime.getRuntime();
              long freeM = currR.freeMemory();
              long totalM = currR.totalMemory();
              long maxM = currR.maxMemory();
              logMessage("Memory (free/total/max.) in bytes: "
                + printLong(freeM) + " / " + printLong(totalM) + " / "
                + printLong(maxM));
              statusMessage("Memory (free/total/max.) in bytes: "
                + printLong(freeM) + " / " + printLong(totalM) + " / "
                + printLong(maxM));
            }
          });
          gcMenu.add(availMem);
          JMenuItem runGC = new JMenuItem("Run garbage collector");
          runGC.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ee) {
              statusMessage("Running garbage collector");
              System.gc();
              statusMessage("OK");
            }
          });
          gcMenu.add(runGC);
          gcMenu.show(LogPanel.this, e.getX(), e.getY());
        }
      }
    });
  }

  /**
   * Record the starting of a new task
   */
  public void taskStarted() {
    if (m_TaskMonitor != null) {
      m_TaskMonitor.taskStarted();
    }
  }

  /**
   * Record a task ending
   */
  public void taskFinished() {
    if (m_TaskMonitor != null) {
      m_TaskMonitor.taskFinished();
    }
  }

  /**
   * Gets a string containing current date and time.
   *
   * @return a string containing the date and time.
   */
  protected static String getTimestamp() {

    return (new SimpleDateFormat("HH:mm:ss:")).format(new Date());
  }

  /**
   * Sends the supplied message to the log area. The current timestamp will be
   * prepended.
   *
   * @param message a value of type 'String'
   */
  public synchronized void logMessage(String message) {

    if (m_First) {
      m_First = false;
    } else {
      m_LogText.append("\n");
    }
    m_LogText.append(LogPanel.getTimestamp() + ' ' + message);
    weka.core.logging.Logger.log(weka.core.logging.Logger.Level.INFO, message);
  }

  /**
   * Sends the supplied message to the status line.
   *
   * @param message the status message
   */
  public synchronized void statusMessage(String message) {

    m_StatusLab.setText(message);
  }

  /**
   * Tests out the log panel from the command line.
   *
   * @param args ignored
   */
  public static void main(String[] args) {

    try {
      final javax.swing.JFrame jf = new javax.swing.JFrame("Log Panel");
      jf.getContentPane().setLayout(new BorderLayout());
      final LogPanel lp = new LogPanel();
      jf.getContentPane().add(lp, BorderLayout.CENTER);
      jf.addWindowListener(new java.awt.event.WindowAdapter() {
        public void windowClosing(java.awt.event.WindowEvent e) {
          jf.dispose();
          System.exit(0);
        }
      });
      jf.pack();
      jf.setVisible(true);
      lp.logMessage("Welcome to the generic log panel!");
      lp.statusMessage("Hi there");
      lp.logMessage("Funky chickens");

    } catch (Exception ex) {
      ex.printStackTrace();
      System.err.println(ex.getMessage());
    }
  }
}