Java事件處理機制(自定義事件)
阿新 • • 發佈:2019-01-29
public class DoorManager {
private Collection listeners;
/**
* 新增事件
*
* @param listener
* DoorListener
*/
public void addDoorListener(DoorListener listener) {
if (listeners == null) {
listeners = new HashSet();
}
listeners.add(listener);
}
/**
* 移除事件
*
* @param listener
* DoorListener
*/
public void removeDoorListener(DoorListener listener) {
if (listeners == null)
return;
listeners.remove(listener);
}
/**
* 觸發開門事件
*/
protected void fireWorkspaceOpened() {
if (listeners == null)
return;
DoorEvent event = new DoorEvent(this, "open");
notifyListeners(event);
}
/**
* 觸發關門事件
*/
protected void fireWorkspaceClosed() {
if (listeners == null)
return;
DoorEvent event = new DoorEvent(this , "close");
notifyListeners(event);
}
/**
* 通知所有的DoorListener
*/
private void notifyListeners(DoorEvent event) {
Iterator iter = listeners.iterator();
while (iter.hasNext()) {
DoorListener listener = (DoorListener) iter.next();
listener.doorEvent(event);
}
}
}