blob: 6ff029ddce31e9e590f2a87a10a6ca3ab8262fa5 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*****************************************************************************
* Copyright (c) 2010-2011 CEA LIST.
*
*
* 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:
*
* Patrick Tessier (CEA LIST) Patrick.tessier@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.sysml.modelexplorer.handler;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.facet.infra.browser.uicore.internal.model.LinkItem;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.emf.utils.ServiceUtilsForHandlers;
import org.eclipse.papyrus.sysml.modelexplorer.Activator;
import org.eclipse.papyrus.views.modelexplorer.CommandContext;
import org.eclipse.papyrus.views.modelexplorer.ICommandContext;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
/**
* <pre>
*
* This abstract command handler manages:
* - current selection in order to build a list of the selected {@link EObject}
* - execute the command (returned by children) in Papyrus {@link TransactionalEditingDomain}
* - calculate the command enablement and visibility regarding the command executability
* (the command is now shown in menu if not executable).
*
* </pre>
*/
public abstract class AbstractCommandHandler extends AbstractHandler {
/**
* <pre>
*
* Returns the command to execute (to be implemented
* in children implementing this class)
*
* @return the command to execute
*
* </pre>
*/
protected abstract Command getCommand();
/**
* <pre>
* Parse current selection and extract the command context (can be null).
*
* @return the command context based on current selection
* </pre>
*/
protected ICommandContext getCommandContext() {
// Get current selection from workbench
IWorkbenchWindow activeWorkbenchWindow = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
Object selection = (activeWorkbenchWindow != null) ? activeWorkbenchWindow.getSelectionService().getSelection() : null;
// If the selection is null, return null command context.
if(selection == null) {
return null;
}
// Get first element if the selection is an IStructuredSelection
if(selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection)selection;
selection = structuredSelection.getFirstElement();
}
// Treat non-null selected object (try to adapt and return EObject or EReference)
EObject container = null;
EReference reference = null;
if(selection instanceof IAdaptable) {
container = (EObject)((IAdaptable)selection).getAdapter(EObject.class);
if(container == null) {
reference = (EReference)((IAdaptable)selection).getAdapter(EReference.class);
// The following part introduce a dependency to EMF Facet.
// Although the selection can be adapted to EReference, the link parent is required but
// no API allows to get this element except LinkItem or ITreeElement.
if((reference != null) && (selection instanceof LinkItem)) {
container = ((LinkItem)selection).getParent();
}
}
}
// Prepare the command context
ICommandContext context = null;
if(container != null) {
if(reference != null) {
context = new CommandContext(container, reference);
} else {
context = new CommandContext(container);
}
}
// Return the context
return context;
}
/**
*
* @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*
* @param event
* @return null
* @throws ExecutionException
*/
public Object execute(ExecutionEvent event) throws ExecutionException {
Command creationcommand = null;
try {
ServiceUtilsForHandlers util = ServiceUtilsForHandlers.getInstance();
creationcommand = getCommand();
util.getTransactionalEditingDomain(event).getCommandStack().execute(creationcommand);
return creationcommand.getResult();
} catch (ServiceException e) {
Activator.log.error("Unexpected error while executing command.", e);
}
return null;
}
/**
*
* @see org.eclipse.core.commands.AbstractHandler#isEnabled()
*
* @return true (enabled) when the command can be executed.
*/
@Override
public boolean isEnabled() {
return getCommand().canExecute();
}
/**
*
* @return true (visible) when the command can be executed.
*/
public boolean isVisible() {
return getCommand().canExecute();
}
}
|
