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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 .
 */

/*
 *    AbstractTrainingSetProducer.java
 *    Copyright (C) 2002-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.beans;

import java.awt.BorderLayout;
import java.beans.EventSetDescriptor;
import java.io.Serializable;
import java.util.EventListener;
import java.util.Vector;

import javax.swing.JPanel;

/**
 * Abstract class for TrainingSetProducers that contains default implementations
 * of add/remove listener methods and default visual representation
 * 
 * @author Mark Hall
 * @version $Revision: 10216 $
 * @since 1.0
 * @see TrainingSetProducer
 */
public abstract class AbstractTrainingSetProducer extends JPanel implements
  TrainingSetProducer, Visible, BeanCommon, Serializable {

  /** for serialization */
  private static final long serialVersionUID = -7842746199524591125L;

  /**
   * Objects listening for training set events
   */
  protected Vector m_listeners = new Vector();

  protected BeanVisual m_visual = new BeanVisual("AbstractTraingSetProducer",
    BeanVisual.ICON_PATH + "DefaultTrainTest.gif", BeanVisual.ICON_PATH
      + "DefaultTrainTest_animated.gif");

  /**
   * non null if this object is a target for any events.
   */
  protected Object m_listenee = null;

  protected transient weka.gui.Logger m_logger = null;

  /**
   * Creates a new AbstractTrainingSetProducer instance.
   */
  public AbstractTrainingSetProducer() {
    setLayout(new BorderLayout());
    add(m_visual, BorderLayout.CENTER);
  }

  /**
   * Add a training set listener
   * 
   * @param tsl a TrainingSetListener value
   */
  @Override
  public synchronized void addTrainingSetListener(TrainingSetListener tsl) {
    m_listeners.addElement(tsl);
  }

  /**
   * Remove a training set listener
   * 
   * @param tsl a TrainingSetListener value
   */
  @Override
  public synchronized void removeTrainingSetListener(TrainingSetListener tsl) {
    m_listeners.removeElement(tsl);
  }

  /**
   * Set the visual for this bean
   * 
   * @param newVisual a BeanVisual value
   */
  @Override
  public void setVisual(BeanVisual newVisual) {
    m_visual = newVisual;
  }

  /**
   * Get the visual for this bean
   * 
   * @return a BeanVisual value
   */
  @Override
  public BeanVisual getVisual() {
    return m_visual;
  }

  /**
   * Use the default visual for this bean
   */
  @Override
  public void useDefaultVisual() {
    m_visual.loadIcons(BeanVisual.ICON_PATH + "DefaultTrainTest.gif",
      BeanVisual.ICON_PATH + "DefaultTrainTest_animated.gif");
  }

  /**
   * Returns true if, at this time, the object will accept a connection
   * according to the supplied event name
   * 
   * @param eventName the event
   * @return true if the object will accept a connection
   */
  @Override
  public boolean connectionAllowed(String eventName) {
    return (m_listenee == null);
  }

  /**
   * Returns true if, at this time, the object will accept a connection
   * according to the supplied EventSetDescriptor
   * 
   * @param esd the EventSetDescriptor
   * @return true if the object will accept a connection
   */
  @Override
  public boolean connectionAllowed(EventSetDescriptor esd) {
    return connectionAllowed(esd.getName());
  }

  /**
   * Notify this object that it has been registered as a listener with a source
   * with respect to the supplied event name
   * 
   * @param eventName
   * @param source the source with which this object has been registered as a
   *          listener
   */
  @Override
  public synchronized void connectionNotification(String eventName,
    Object source) {
    if (connectionAllowed(eventName)) {
      m_listenee = source;
    }
  }

  /**
   * Notify this object that it has been deregistered as a listener with a
   * source with respect to the supplied event name
   * 
   * @param eventName the event name
   * @param source the source with which this object has been registered as a
   *          listener
   */
  @Override
  public synchronized void disconnectionNotification(String eventName,
    Object source) {
    if (m_listenee == source) {
      m_listenee = null;
    }
  }

  /**
   * Set a logger
   * 
   * @param logger a weka.gui.Logger value
   */
  @Override
  public void setLog(weka.gui.Logger logger) {
    m_logger = logger;
  }

  /**
   * Stop any processing that the bean might be doing. Subclass must implement
   */
  @Override
  public abstract void stop();

}