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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 .
 */

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

package weka.gui.beans;

import java.awt.BorderLayout;
import java.beans.PropertyChangeListener;
import java.beans.VetoableChangeListener;
import java.beans.beancontext.BeanContext;
import java.beans.beancontext.BeanContextChild;
import java.beans.beancontext.BeanContextChildSupport;
import java.io.Serializable;
import java.util.EventListener;
import java.util.Vector;

import javax.swing.JPanel;

/**
 * Abstract class for objects that can provide instances from some source
 * 
 * @author Mark Hall
 * @version $Revision: 10216 $
 * @since 1.0
 * @see JPanel
 * @see DataSource
 * @see Serializable
 */
public abstract class AbstractDataSource extends JPanel implements DataSource,
  Visible, Serializable, BeanContextChild {

  /** for serialization */
  private static final long serialVersionUID = -4127257701890044793L;

  /**
   * True if this bean's appearance is the design mode appearance
   */
  protected boolean m_design;

  /**
   * BeanContex that this bean might be contained within
   */
  protected transient BeanContext m_beanContext = null;

  /**
   * BeanContextChild support
   */
  protected BeanContextChildSupport m_bcSupport = new BeanContextChildSupport(
    this);

  /**
   * Default visual for data sources
   */
  protected BeanVisual m_visual = new BeanVisual("AbstractDataSource",
    BeanVisual.ICON_PATH + "DefaultDataSource.gif", BeanVisual.ICON_PATH
      + "DefaultDataSource_animated.gif");

  /**
   * Objects listening for events from data sources
   */
  protected Vector m_listeners;

  /**
   * Creates a new AbstractDataSource instance.
   * 
   */
  public AbstractDataSource() {
    useDefaultVisual();
    setLayout(new BorderLayout());
    add(m_visual, BorderLayout.CENTER);
    m_listeners = new Vector();
  }

  /**
   * Add a listener
   * 
   * @param dsl a DataSourceListener value
   */
  @Override
  public synchronized void addDataSourceListener(DataSourceListener dsl) {
    m_listeners.addElement(dsl);
  }

  /**
   * Remove a listener
   * 
   * @param dsl a DataSourceListener value
   */
  @Override
  public synchronized void removeDataSourceListener(DataSourceListener dsl) {
    m_listeners.remove(dsl);
  }

  /**
   * Add an instance listener
   * 
   * @param dsl a InstanceListener value
   */
  @Override
  public synchronized void addInstanceListener(InstanceListener dsl) {
    m_listeners.add(dsl);
  }

  /**
   * Remove an instance listener
   * 
   * @param dsl a InstanceListener value
   */
  @Override
  public synchronized void removeInstanceListener(InstanceListener dsl) {
    m_listeners.remove(dsl);
  }

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

  /**
   * Get the visual being used by this data source.
   * 
   */
  @Override
  public BeanVisual getVisual() {
    return m_visual;
  }

  /**
   * Use the default images for a data source
   * 
   */
  @Override
  public void useDefaultVisual() {
    m_visual.loadIcons(BeanVisual.ICON_PATH + "DefaultDataSource.gif",
      BeanVisual.ICON_PATH + "DefaultDataSource_animated.gif");
  }

  /**
   * Set a bean context for this bean
   * 
   * @param bc a BeanContext value
   */
  @Override
  public void setBeanContext(BeanContext bc) {
    m_beanContext = bc;
    m_design = m_beanContext.isDesignTime();
  }

  /**
   * Return the bean context (if any) that this bean is embedded in
   * 
   * @return a BeanContext value
   */
  @Override
  public BeanContext getBeanContext() {
    return m_beanContext;
  }

  /**
   * Add a property change listener to this bean
   * 
   * @param name the name of the property of interest
   * @param pcl a PropertyChangeListener value
   */
  @Override
  public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
    m_bcSupport.addPropertyChangeListener(name, pcl);
  }

  /**
   * Remove a property change listener from this bean
   * 
   * @param name the name of the property of interest
   * @param pcl a PropertyChangeListener value
   */
  @Override
  public void removePropertyChangeListener(String name,
    PropertyChangeListener pcl) {
    m_bcSupport.removePropertyChangeListener(name, pcl);
  }

  /**
   * Add a vetoable change listener to this bean
   * 
   * @param name the name of the property of interest
   * @param vcl a VetoableChangeListener value
   */
  @Override
  public void addVetoableChangeListener(String name, VetoableChangeListener vcl) {
    m_bcSupport.addVetoableChangeListener(name, vcl);
  }

  /**
   * Remove a vetoable change listener from this bean
   * 
   * @param name the name of the property of interest
   * @param vcl a VetoableChangeListener value
   */
  @Override
  public void removeVetoableChangeListener(String name,
    VetoableChangeListener vcl) {
    m_bcSupport.removeVetoableChangeListener(name, vcl);
  }
}