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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 .
 */

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

package weka.gui.streams;

import java.awt.Color;

import javax.swing.JLabel;
import javax.swing.JPanel;

import weka.core.Instance;
import weka.core.Instances;

/**
 * A bean that counts instances streamed to it.
 * 
 * @author Len Trigg ([email protected])
 * @version $Revision: 10222 $
 */
public class InstanceCounter extends JPanel implements InstanceListener {

  /** for serialization */
  private static final long serialVersionUID = -6084967152645935934L;

  private final JLabel m_Count_Lab;
  private int m_Count;
  private boolean m_Debug;

  public void input(Instance instance) throws Exception {

    if (m_Debug) {
      System.err.println("InstanceCounter::input(" + instance + ")");
    }
    m_Count++;
    m_Count_Lab.setText("" + m_Count + " instances");
    repaint();
  }

  public void inputFormat(Instances instanceInfo) {

    if (m_Debug) {
      System.err.println("InstanceCounter::inputFormat()");
    }
    // Instances inputInstances = new Instances(instanceInfo,0); NOT USED
    m_Count = 0;
    m_Count_Lab.setText("" + m_Count + " instances");
  }

  public void setDebug(boolean debug) {

    m_Debug = debug;
  }

  public boolean getDebug() {

    return m_Debug;
  }

  public InstanceCounter() {

    m_Count = 0;
    m_Count_Lab = new JLabel("no instances");
    add(m_Count_Lab);
    // setSize(60,40);
    setBackground(Color.lightGray);
  }

  @Override
  public void instanceProduced(InstanceEvent e) {

    Object source = e.getSource();
    if (source instanceof InstanceProducer) {
      try {
        InstanceProducer a = (InstanceProducer) source;
        switch (e.getID()) {
        case InstanceEvent.FORMAT_AVAILABLE:
          inputFormat(a.outputFormat());
          break;
        case InstanceEvent.INSTANCE_AVAILABLE:
          input(a.outputPeek());
          break;
        case InstanceEvent.BATCH_FINISHED:
          if (m_Debug) {
            System.err
              .println("InstanceCounter::instanceProduced() - End of instance batch");
          }
          break;
        default:
          System.err
            .println("InstanceCounter::instanceProduced() - unknown event type");
          break;
        }
      } catch (Exception ex) {
        System.err.println(ex.getMessage());
      }
    } else {
      System.err
        .println("InstanceCounter::instanceProduced() - Unknown source object type");
    }
  }
}