path: root/libjava/javax/swing/AbstractAction.java

/* AbstractAction.java --
   Copyright (C) 2002, 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.

GNU Classpath is distributed in the hope that it will be useful, but
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
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this exception to your version of the library, but you are not
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package javax.swing;

import java.beans.PropertyChangeListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.HashMap;

import javax.swing.event.SwingPropertyChangeSupport;

/**
 * AbstractAction
 * @author	Andrew Selkirk
 * @version	1.0
 */
public abstract class AbstractAction
  implements Action, Cloneable, Serializable
{
  private static final long serialVersionUID = -6803159439231523484L;

  /**
   * enabled
   */
  protected boolean enabled = true;
  
  /**
   * changeSupport
   */
  protected SwingPropertyChangeSupport changeSupport =
    new SwingPropertyChangeSupport(this);

  /**
   * store
   */
  private transient HashMap store = new HashMap();

  /**
   * Constructor AbstractAction
   */
  public AbstractAction()
  {
    this(""); // TODO: default name
  }

  /**
   * Constructor AbstractAction
   *
   * @param name TODO
   */
  public AbstractAction(String name)
  {
    this(name, null); // TODO: default icon??
  }

  /**
   * Constructor AbstractAction
   *
   * @param name TODO
   * @param icon TODO
   */
  public AbstractAction(String name, Icon icon)
  {
    putValue(NAME, name);
    putValue(SMALL_ICON, icon);
  }

  /**
   * readObject
   *
   * @param stream the stream to read from
   *
   * @exception ClassNotFoundException TODO
   * @exception IOException if an error occurs
   */
  private void readObject(ObjectInputStream stream)
    throws ClassNotFoundException, IOException
  {
    // TODO
  }

  /**
   * writeObject
   *
   * @param stream the stream to write to
   *
   * @exception IOException if an error occurs
   */
  private void writeObject(ObjectOutputStream stream) throws IOException
  {
    // TODO
  }

  /**
   * clone
   *
   * @return Object
   *
   * @exception CloneNotSupportedException TODO
   */
  protected Object clone() throws CloneNotSupportedException
  {
    AbstractAction copy = (AbstractAction) super.clone();
    copy.store = (HashMap) store.clone();
    return copy;
  }

  /**
   * Returns a value for a given key from the built-in store.
   *
   * @param key the key to get the value for
   *
   * @return Object
   */
  public Object getValue(String key)
  {
    return store.get(key);
  }

  /**
   * Puts a key/value pair into the built-in store.
   *
   * @param key the key
   * @param value the value
   */
  public void putValue(String key, Object value)
  {
    Object old = getValue(key);
    if (old != value)
    {
      store.put(key, value);
      firePropertyChange(key, old, value);
    }
  }

  /**
   * isEnabled
   *
   * @return boolean
   */
  public boolean isEnabled()
  {
    return enabled;
  }

  /**
   * setEnabled
   *
   * @param enabled TODO
   */
  public void setEnabled(boolean enabled)
  {
    if (enabled != this.enabled)
    {
      this.enabled = enabled;
      firePropertyChange("enabled", !this.enabled, this.enabled);
    }
  }

  /**
   * getKeys
   * @returns Object[]
   */
  public Object[] getKeys()
  {
    return store.keySet().toArray();
  }

  /**
   * This method fires a PropertyChangeEvent given the propertyName 
   * and the old and new values.
   *
   * @param propertyName The property that changed.
   * @param oldValue The old value of the property.
   * @param newValue The new value of the property.
   */
  protected void firePropertyChange(String propertyName, Object oldValue,
                                    Object newValue)
  {
    changeSupport.firePropertyChange(propertyName, oldValue, newValue);
  }
  
  /**
   * This convenience method fires a PropertyChangeEvent given 
   * the propertyName and the old and new values.
   *
   * @param propertyName The property that changed.
   * @param oldValue The old value of the property.
   * @param newValue The new value of the property.
   */
  private void firePropertyChange(String propertyName, boolean oldValue, boolean newValue)
  {
    changeSupport.firePropertyChange(propertyName, oldValue, newValue);
  }

  /**
   * addPropertyChangeListener
   *
   * @param listener the listener to add
   */
  public void addPropertyChangeListener(PropertyChangeListener listener)
  {
    changeSupport.addPropertyChangeListener(listener);
  }

  /**
   * removePropertyChangeListener
   *
   * @param listener the listener to remove
   */
  public void removePropertyChangeListener(PropertyChangeListener listener)
  {
    changeSupport.removePropertyChangeListener(listener);
  }

  /**
   * Returns all registered listeners.
   *
   * @return array of listeners.
   * 
   * @since 1.4
   */
  public PropertyChangeListener[] getPropertyChangeListeners()
  {
    return changeSupport.getPropertyChangeListeners();
  }
}