/**
* Serializes this <code>DragSource</code>. This method first performs default serialization.
* Next, it writes out this object's <code>FlavorMap</code> if and only if it can be serialized.
* If not, <code>null</code> is written instead. Next, it writes out <code>Serializable</code>
* listeners registered with this object. Listeners are written in a <code>null</code>-terminated
* sequence of 0 or more pairs. The pair consists of a <code>String</code> and an <code>Object
* </code>; the <code>String</code> indicates the type of the <code>Object</code> and is one of
* the following:
*
* <ul>
* <li><code>dragSourceListenerK</code> indicating a <code>DragSourceListener</code> object;
* <li><code>dragSourceMotionListenerK</code> indicating a <code>DragSourceMotionListener</code>
* object.
* </ul>
*
* @serialData Either a <code>FlavorMap</code> instance, or <code>null</code>, followed by a
* <code>null</code>-terminated sequence of 0 or more pairs; the pair consists of a <code>
* String</code> and an <code>Object</code>; the <code>String</code> indicates the type of the
* <code>Object</code> and is one of the following:
* <ul>
* <li><code>dragSourceListenerK</code> indicating a <code>DragSourceListener</code> object;
* <li><code>dragSourceMotionListenerK</code> indicating a <code>DragSourceMotionListener
* </code> object.
* </ul>
* .
* @since 1.4
*/
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
s.writeObject(SerializationTester.test(flavorMap) ? flavorMap : null);
DnDEventMulticaster.save(s, dragSourceListenerK, listener);
DnDEventMulticaster.save(s, dragSourceMotionListenerK, motionListener);
s.writeObject(null);
}
/**
* Removes the specified <code>DragSourceMotionListener</code> from this <code>DragSource</code>.
* If a <code>null</code> listener is specified, no action is taken and no exception is thrown. If
* the listener specified by the argument was not previously added to this <code>DragSource</code>
* , no action is taken and no exception is thrown.
*
* @param dsml the <code>DragSourceMotionListener</code> to remove
* @see #addDragSourceMotionListener
* @see #getDragSourceMotionListeners
* @since 1.4
*/
public void removeDragSourceMotionListener(DragSourceMotionListener dsml) {
if (dsml != null) {
synchronized (this) {
motionListener = DnDEventMulticaster.remove(motionListener, dsml);
}
}
}
/**
* Removes the specified <code>DragSourceListener</code> from this <code>DragSource</code>. If a
* <code>null</code> listener is specified, no action is taken and no exception is thrown. If the
* listener specified by the argument was not previously added to this <code>DragSource</code>, no
* action is taken and no exception is thrown.
*
* @param dsl the <code>DragSourceListener</code> to remove
* @see #addDragSourceListener
* @see #getDragSourceListeners
* @since 1.4
*/
public void removeDragSourceListener(DragSourceListener dsl) {
if (dsl != null) {
synchronized (this) {
listener = DnDEventMulticaster.remove(listener, dsl);
}
}
}
/**
* Gets all the objects currently registered as <code><em>Foo</em>Listener</code>s upon this
* <code>DragSource</code>. <code><em>Foo</em>Listener</code>s are registered using the <code>
* add<em>Foo</em>Listener</code> method.
*
* @param listenerType the type of listeners requested; this parameter should specify an interface
* that descends from <code>java.util.EventListener</code>
* @return an array of all objects registered as <code><em>Foo</em>Listener</code>s on this <code>
* DragSource</code>, or an empty array if no such listeners have been added
* @exception <code>ClassCastException</code> if <code>listenerType</code> doesn't specify a class
* or interface that implements <code>java.util.EventListener</code>
* @see #getDragSourceListeners
* @see #getDragSourceMotionListeners
* @since 1.4
*/
public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
EventListener l = null;
if (listenerType == DragSourceListener.class) {
l = listener;
} else if (listenerType == DragSourceMotionListener.class) {
l = motionListener;
}
return DnDEventMulticaster.getListeners(l, listenerType);
}