| /******************************************************************************* |
| * Copyright (c) 2007, 2008 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 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.pde.internal.ua.ui.editor.cheatsheet.simple; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.eclipse.core.runtime.ListenerList; |
| |
| /** |
| * SimpleCSCommandManager |
| * |
| */ |
| public class SimpleCSCommandManager { |
| |
| private ListenerList fListeners; |
| |
| private static SimpleCSCommandManager fPinstance; |
| |
| private Map fCommandMap; |
| |
| private boolean fBlockEvents; |
| |
| /** |
| * |
| */ |
| private SimpleCSCommandManager() { |
| fCommandMap = Collections.synchronizedMap(new HashMap()); |
| fBlockEvents = false; |
| fListeners = null; |
| } |
| |
| /** |
| * @param block |
| */ |
| public void setBlockEvents(boolean block) { |
| fBlockEvents = block; |
| } |
| |
| /** |
| * @return |
| */ |
| public boolean getBlockEvents() { |
| return fBlockEvents; |
| } |
| |
| /** |
| * @return |
| */ |
| public static SimpleCSCommandManager Instance() { |
| if (fPinstance == null) { |
| fPinstance = new SimpleCSCommandManager(); |
| } |
| return fPinstance; |
| } |
| |
| /** |
| * @param key |
| * @param value |
| * @return |
| */ |
| public synchronized boolean put(String key, String value) { |
| // Do not add the key-value pair if it is already in the map |
| if (fCommandMap.containsKey(key)) { |
| String presentValue = (String) fCommandMap.get(key); |
| if ((presentValue == null) && (value == null)) { |
| // Key-value pair not added |
| return false; |
| } else if ((presentValue != null) && (presentValue.equals(value))) { |
| // Key-value pair not added |
| return false; |
| } |
| } |
| // Insert the key-value pair into the map |
| fCommandMap.put(key, value); |
| // Notify all listeners of the new key-value pair |
| fireNewCommandKeyEvent(key, value); |
| // Key-value pair added |
| return true; |
| } |
| |
| /** |
| * @param key |
| * @return |
| */ |
| public String get(String key) { |
| return (String) fCommandMap.get(key); |
| } |
| |
| /** |
| * @param key |
| * @return |
| */ |
| public boolean hasKey(String key) { |
| return fCommandMap.containsKey(key); |
| } |
| |
| /** |
| * @return |
| */ |
| public Set getKeys() { |
| return fCommandMap.keySet(); |
| } |
| |
| /** |
| * @return |
| */ |
| public int getSize() { |
| return fCommandMap.size(); |
| } |
| |
| /** |
| * @param listener |
| */ |
| public void addCommandKeyListener(ISimpleCSCommandKeyListener listener) { |
| if (fListeners == null) { |
| fListeners = new ListenerList(); |
| } |
| fListeners.add(listener); |
| } |
| |
| /** |
| * @param listener |
| */ |
| public void removeCommandKeyListener(ISimpleCSCommandKeyListener listener) { |
| if (fListeners == null) { |
| return; |
| } |
| fListeners.remove(listener); |
| } |
| |
| /** |
| * @param key |
| * @param value |
| */ |
| private void fireNewCommandKeyEvent(String key, String value) { |
| // Do not fire the event if there are no listeners or we are blocking |
| // events |
| if ((fBlockEvents == true) || (fListeners == null) || (fListeners.size() == 0)) { |
| return; |
| } |
| // Create the event |
| NewCommandKeyEvent event = new NewCommandKeyEvent(this, key, value); |
| // Notify all listeners |
| Object[] listenerList = fListeners.getListeners(); |
| for (int i = 0; i < fListeners.size(); i++) { |
| ISimpleCSCommandKeyListener listener = (ISimpleCSCommandKeyListener) listenerList[i]; |
| listener.newCommandKey(event); |
| } |
| } |
| |
| } |