Examples of org.eclipse.core.runtime.ListenerList

org.eclipse.core.runtime.ListenerList
This class is a thread safe list that is designed for storing lists of listeners. The implementation is optimized for minimal memory footprint, frequent reads and infrequent writes. Modification of the list is synchronized and relatively expensive, while accessing the listeners is very fast. Readers are given access to the underlying array data structure for reading, with the trust that they will not modify the underlying array.
A listener list handles the same listener being added multiple times, and tolerates removal of listeners that are the same as other listeners in the list. For this purpose, listeners can be compared with each other using either equality or identity, as specified in the list constructor.
Use the getListeners method when notifying listeners. The recommended code sequence for notifying all registered listeners of say, FooListener.eventHappened, is:
```
 Object[] listeners = myListenerList.getListeners(); for (int i = 0; i < listeners.length; ++i) { ((FooListener) listeners[i]).eventHappened(event); } 
```
This class can be used without OSGi running.
@since org.eclipse.equinox.common 3.2

    Assert.isNotNull(document);
    fDocument= document;
    fHistory= OperationHistoryFactory.getOperationHistory();
    fUndoContext= new ObjectUndoContext(fDocument);
    fConnected= new ArrayList();
    fDocumentUndoListeners= new ListenerList(ListenerList.IDENTITY);
  }

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  /**
   * Constructs a new string variable manager. 
   */
  private StringVariableManager() {
    fListeners = new ListenerList();
  }

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    /* (non-Javadoc)
   * @see org.eclipse.ui.console.IConsoleManager#addConsoleListener(org.eclipse.ui.console.IConsoleListener)
   */
  public void addConsoleListener(IConsoleListener listener) {
    if (fListeners == null) {
      fListeners = new ListenerList();
    }
    fListeners.add(listener);
  }

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   * @param listener
   *            the event listener to add
   */
  public void addHyperlinkListener(IHyperlinkListener listener) {
    if (listeners == null)
      listeners = new ListenerList();
    listeners.add(listener);
  }

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   * @param console
   */
  private void activateParticipants(IConsole console) {
    // activate
    if (console != null && fActive) {
      final ListenerList listeners = getParticipants(console);
      if (listeners != null) {
        Object[] participants = listeners.getListeners();
          for (int i = 0; i < participants.length; i++) {
            final IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
            SafeRunner.run(new ISafeRunnable() {
            public void run() throws Exception {
              participant.activated();
            }
            public void handleException(Throwable exception) {
              ConsolePlugin.log(exception);
              listeners.remove(participant);
            }
          });
          }
      }
    }

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   */
  protected void doDestroyPage(IWorkbenchPart part, PageRec pageRecord) {
      IConsole console = (IConsole)fPartToConsole.get(part);
      
    // dispose page participants
    ListenerList listeners = (ListenerList) fConsoleToPageParticipants.remove(console);
    if (listeners != null) {
      Object[] participants = listeners.getListeners();
      for (int i = 0; i < participants.length; i++) {
              final IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
              SafeRunner.run(new ISafeRunnable() {
          public void run() throws Exception {
            participant.dispose();

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    page.createControl(getPageBook());
    console.addPropertyChangeListener(this);
    
    // initialize page participants
    IConsolePageParticipant[] consoleParticipants = ((ConsoleManager)getConsoleManager()).getPageParticipants(console);
    final ListenerList participants = new ListenerList();
    for (int i = 0; i < consoleParticipants.length; i++) {
      participants.add(consoleParticipants[i]);
    }
    fConsoleToPageParticipants.put(console, participants);
    Object[] listeners = participants.getListeners();
    for (int i = 0; i < listeners.length; i++) {
            final IConsolePageParticipant participant = (IConsolePageParticipant) listeners[i];
            SafeRunner.run(new ISafeRunnable() {
        public void run() throws Exception {
          participant.init(page, console);
        }
        public void handleException(Throwable exception) {
          ConsolePlugin.log(exception);
          participants.remove(participant);
        }
      });
        }
    
    PageRec rec = new PageRec(dummyPart, page);

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    public Object getAdapter(Class key) {
        Object adpater = super.getAdapter(key);
        if (adpater == null) {
            IConsole console = getConsole();
            if (console != null) {
                ListenerList listeners = getParticipants(console);
                // an adapter can be asked for before the console participants are created
                if (listeners != null) {
                  Object[] participants = listeners.getListeners();
                    for (int i = 0; i < participants.length; i++) {
                        IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
                        adpater = participant.getAdapter(key);
                        if (adpater != null) {
                            return adpater;

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   * @param console console to deactivate
   */
  private void deactivateParticipants(IConsole console) {
    // deactivate
      if (console != null) {
      final ListenerList listeners = getParticipants(console);
      if (listeners != null) {
        Object[] participants = listeners.getListeners();
          for (int i = 0; i < participants.length; i++) {
            final IConsolePageParticipant participant = (IConsolePageParticipant) participants[i];
            SafeRunner.run(new ISafeRunnable() {
            public void run() throws Exception {
              participant.deactivated();
            }
            public void handleException(Throwable exception) {
              ConsolePlugin.log(exception);
              listeners.remove(participant);
            }
          });
                }
      }
      }

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            .arraycopy(listenerLists, 0,
                listenerLists = new ListenerList[length + 1],
                0, length);
      }
      listenerTypes[length] = listenerType;
      listenerLists[length] = new ListenerList();
      listenerTypeIndex = length;
    }
    boolean hadListeners = hasListeners();
    listenerLists[listenerTypeIndex].add(listener);
    if (!hadListeners && hasListeners()) {

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