Initial revision

From-SVN: r102074

libjava/classpath/javax/swing/AbstractSpinnerModel.java

@@ -0,0 +1,117 @@
+/* AbstractSpinnerModel.java --
+   Copyright (C) 2004 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
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+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
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing;
+
+import java.util.EventListener;
+
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import javax.swing.event.EventListenerList;
+
+/**
+ * AbstractSpinnerModel
+ * @author	Ka-Hing Cheung
+ * @version	1.0
+ */
+public abstract class AbstractSpinnerModel implements SpinnerModel
+{
+  private ChangeEvent changeEvent = new ChangeEvent(this);
+  
+  protected EventListenerList listenerList = new EventListenerList();
+
+  /**
+   * Creates an <code>AbstractSpinnerModel</code>.
+   */
+  public AbstractSpinnerModel()
+  {
+  }
+
+  /**
+   * Adds a <code>ChangeListener</code>.
+   *
+   * @param listener the listener to add
+   */
+  public void addChangeListener(ChangeListener listener)
+  {
+    listenerList.add(ChangeListener.class, listener);
+  }
+
+  /**
+   * Gets all the listeners that are of a particular type.
+   *
+   * @param c the type of listener
+   * @return the listeners that are of the specific type
+   */
+  public EventListener[] getListeners(Class c)
+  {
+    return listenerList.getListeners(c);
+  }
+
+  /**
+   * Gets all the <code>ChangeListener</code>s.
+   *
+   * @return all the <code>ChangeListener</code>s
+   */
+  public ChangeListener[] getChangeListeners()
+  {
+    return (ChangeListener[]) listenerList.getListeners(ChangeListener.class);
+  }
+
+  /**
+   * Remove a particular listener.
+   *
+   * @param listener the listener to remove
+   */
+  public void removeChangeListener(ChangeListener listener)
+  {
+    listenerList.remove(ChangeListener.class, listener);
+  }
+
+  /**
+   * Fires a <code>ChangeEvent</code> to all the <code>ChangeListener</code>s
+   * added to this model
+   */
+  protected void fireStateChanged()
+  {
+    ChangeListener[] listeners = getChangeListeners();
+
+    for(int i = 0; i < listeners.length; ++i)
+      listeners[i].stateChanged(changeEvent);
+  }
+}