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1 | /********************************************************************** |
2 | * Copyright (c) 2012 Ericsson | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are | |
5 | * made available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: | |
10 | * Bernd Hufmann - Initial API and implementation | |
11 | **********************************************************************/ | |
115b4a01 | 12 | package org.eclipse.linuxtools.internal.lttng2.ui.views.control.handlers; |
eb1bab5b | 13 | |
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14 | import org.eclipse.jface.viewers.ISelection; |
15 | import org.eclipse.jface.viewers.StructuredSelection; | |
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16 | import org.eclipse.linuxtools.internal.lttng2.ui.views.control.ControlView; |
17 | import org.eclipse.linuxtools.internal.lttng2.ui.views.control.model.impl.TargetNodeComponent; | |
eb1bab5b | 18 | import org.eclipse.ui.IWorkbenchPage; |
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19 | |
20 | /** | |
21 | * <b><u>BaseNodeHandler</u></b> | |
22 | * <p> | |
23 | * Command handler implementation to delete a target host. | |
24 | * </p> | |
25 | */ | |
498704b3 | 26 | abstract public class BaseNodeHandler extends BaseControlViewHandler { |
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27 | |
28 | // ------------------------------------------------------------------------ | |
29 | // Attributes | |
30 | // ------------------------------------------------------------------------ | |
31 | /** | |
32 | * The target node component the command is to be executed on. | |
33 | */ | |
34 | protected TargetNodeComponent fTargetNode = null; | |
35 | ||
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36 | // ------------------------------------------------------------------------ |
37 | // Operations | |
38 | // ------------------------------------------------------------------------ | |
39 | /* | |
40 | * (non-Javadoc) | |
4775bcbf | 41 | * @see org.eclipse.core.commands.AbstractHandler#isEnabled() |
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42 | */ |
43 | @Override | |
44 | public boolean isEnabled() { | |
eb1bab5b | 45 | |
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46 | // Get workbench page for the Control View |
47 | IWorkbenchPage page = getWorkbenchPage(); | |
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48 | if (page == null) { |
49 | return false; | |
50 | } | |
51 | ||
c56972bb | 52 | TargetNodeComponent node = null; |
bbb3538a | 53 | // Check if the node component is selected |
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54 | ISelection selection = page.getSelection(ControlView.ID); |
55 | if (selection instanceof StructuredSelection) { | |
56 | Object element = ((StructuredSelection) selection).getFirstElement(); | |
c56972bb | 57 | node = (element instanceof TargetNodeComponent) ? (TargetNodeComponent) element : null; |
eb1bab5b | 58 | } |
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59 | boolean isEnabled = node != null; |
60 | fLock.lock(); | |
61 | try { | |
62 | if (isEnabled) { | |
63 | fTargetNode = node; | |
64 | } | |
65 | } finally { | |
66 | fLock.unlock(); | |
67 | } | |
68 | return isEnabled; | |
eb1bab5b | 69 | } |
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70 | |
71 | ||
eb1bab5b | 72 | } |