1 /*******************************************************************************
2  * Copyright (c) 2007, 2015 IBM Corporation and others.
3  *
4  * This program and the accompanying materials
5  * are made available under the terms of the Eclipse Public License 2.0
6  * which accompanies this distribution, and is available at
7  * https://www.eclipse.org/legal/epl-2.0/
8  *
9  * SPDX-License-Identifier: EPL-2.0
10  *
11  * Contributors:
12  *     IBM Corporation - initial API and implementation
13  ******************************************************************************/
14 
15 package org.eclipse.ui.internal;
16 
17 import java.util.HashMap;
18 import java.util.Map;
19 import java.util.Map.Entry;
20 import org.eclipse.core.runtime.ListenerList;
21 import org.eclipse.jface.viewers.ISelection;
22 import org.eclipse.ui.ISelectionListener;
23 import org.eclipse.ui.ISelectionService;
24 import org.eclipse.ui.services.IDisposable;
25 
26 /**
27  * @since 3.4
28  *
29  */
30 public class SlaveSelectionService implements ISelectionService, IDisposable {
31 
32 	private ListenerList<ISelectionListener> postListeners = new ListenerList<>(ListenerList.IDENTITY);
33 	private ListenerList<ISelectionListener> listeners = new ListenerList<>(ListenerList.IDENTITY);
34 	private Map<ISelectionListener, String> listenersToPartId = new HashMap<>();
35 	private Map<ISelectionListener, String> postListenersToPartId = new HashMap<>();
36 
37 	private ISelectionService parentSelectionService;
38 
39 	/**
40 	 * @param parentSelectionService
41 	 */
SlaveSelectionService(ISelectionService parentSelectionService)42 	public SlaveSelectionService(ISelectionService parentSelectionService) {
43 		if (parentSelectionService == null) {
44 			throw new IllegalArgumentException("The parent selection service cannot be null"); //$NON-NLS-1$
45 		}
46 		this.parentSelectionService = parentSelectionService;
47 	}
48 
49 	@Override
addPostSelectionListener(ISelectionListener listener)50 	public void addPostSelectionListener(ISelectionListener listener) {
51 		postListeners.add(listener);
52 		parentSelectionService.addPostSelectionListener(listener);
53 	}
54 
55 	@Override
addPostSelectionListener(String partId, ISelectionListener listener)56 	public void addPostSelectionListener(String partId, ISelectionListener listener) {
57 		listenersToPartId.put(listener, partId);
58 		parentSelectionService.addPostSelectionListener(partId, listener);
59 	}
60 
61 	@Override
addSelectionListener(ISelectionListener listener)62 	public void addSelectionListener(ISelectionListener listener) {
63 		listeners.add(listener);
64 		parentSelectionService.addSelectionListener(listener);
65 	}
66 
67 	@Override
addSelectionListener(String partId, ISelectionListener listener)68 	public void addSelectionListener(String partId, ISelectionListener listener) {
69 		postListenersToPartId.put(listener, partId);
70 		parentSelectionService.addPostSelectionListener(partId, listener);
71 	}
72 
73 	@Override
getSelection()74 	public ISelection getSelection() {
75 		return parentSelectionService.getSelection();
76 	}
77 
78 	@Override
getSelection(String partId)79 	public ISelection getSelection(String partId) {
80 		return parentSelectionService.getSelection(partId);
81 	}
82 
83 	@Override
removePostSelectionListener(ISelectionListener listener)84 	public void removePostSelectionListener(ISelectionListener listener) {
85 		postListeners.remove(listener);
86 		parentSelectionService.removePostSelectionListener(listener);
87 	}
88 
89 	@Override
removePostSelectionListener(String partId, ISelectionListener listener)90 	public void removePostSelectionListener(String partId, ISelectionListener listener) {
91 		postListenersToPartId.remove(listener);
92 		parentSelectionService.removePostSelectionListener(partId, listener);
93 	}
94 
95 	@Override
removeSelectionListener(ISelectionListener listener)96 	public void removeSelectionListener(ISelectionListener listener) {
97 		listeners.remove(listener);
98 		parentSelectionService.removeSelectionListener(listener);
99 	}
100 
101 	@Override
removeSelectionListener(String partId, ISelectionListener listener)102 	public void removeSelectionListener(String partId, ISelectionListener listener) {
103 		listenersToPartId.remove(listener);
104 		parentSelectionService.removeSelectionListener(partId, listener);
105 	}
106 
107 	@Override
dispose()108 	public void dispose() {
109 		for (Object listener : listeners.getListeners()) {
110 			parentSelectionService.removeSelectionListener((ISelectionListener) listener);
111 		}
112 		listeners.clear();
113 
114 		for (Object listener : postListeners.getListeners()) {
115 			parentSelectionService.removePostSelectionListener((ISelectionListener) listener);
116 		}
117 		postListeners.clear();
118 
119 		for (Entry<ISelectionListener, String> entry : listenersToPartId.entrySet()) {
120 			parentSelectionService.removeSelectionListener(entry.getValue(), entry.getKey());
121 		}
122 		listenersToPartId.clear();
123 
124 		for (Entry<ISelectionListener, String> entry : postListenersToPartId.entrySet()) {
125 			parentSelectionService.removePostSelectionListener(entry.getValue(), entry.getKey());
126 		}
127 		postListenersToPartId.clear();
128 	}
129 }
130