| /******************************************************************************* |
| * Copyright (c) 2000, 2017 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| *******************************************************************************/ |
| package org.eclipse.dltk.internal.corext.refactoring.changes; |
| |
| import org.eclipse.core.resources.IResourceChangeEvent; |
| import org.eclipse.core.resources.IResourceChangeListener; |
| import org.eclipse.core.resources.ResourcesPlugin; |
| import org.eclipse.core.runtime.ListenerList; |
| |
| public class WorkspaceTracker { |
| |
| public final static WorkspaceTracker INSTANCE = new WorkspaceTracker(); |
| |
| public interface Listener { |
| public void workspaceChanged(); |
| } |
| |
| private ListenerList<Listener> fListeners; |
| private ResourceListener fResourceListener; |
| |
| private WorkspaceTracker() { |
| fListeners = new ListenerList<>(); |
| } |
| |
| private class ResourceListener implements IResourceChangeListener { |
| @Override |
| public void resourceChanged(IResourceChangeEvent event) { |
| workspaceChanged(); |
| } |
| } |
| |
| private void workspaceChanged() { |
| for (Listener listener : fListeners) { |
| listener.workspaceChanged(); |
| } |
| } |
| |
| public void addListener(Listener l) { |
| fListeners.add(l); |
| if (fResourceListener == null) { |
| fResourceListener = new ResourceListener(); |
| ResourcesPlugin.getWorkspace().addResourceChangeListener(fResourceListener); |
| } |
| } |
| |
| public void removeListener(Listener l) { |
| if (fListeners.size() == 0) |
| return; |
| fListeners.remove(l); |
| if (fListeners.size() == 0) { |
| ResourcesPlugin.getWorkspace().removeResourceChangeListener(fResourceListener); |
| fResourceListener = null; |
| } |
| } |
| } |