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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 | /** | |
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21 | * <p> |
22 | * Command handler implementation to delete a target host. | |
23 | * </p> | |
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24 | * |
25 | * @author Bernd Hufmann | |
eb1bab5b | 26 | */ |
498704b3 | 27 | abstract public class BaseNodeHandler extends BaseControlViewHandler { |
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28 | |
29 | // ------------------------------------------------------------------------ | |
30 | // Attributes | |
31 | // ------------------------------------------------------------------------ | |
32 | /** | |
33 | * The target node component the command is to be executed on. | |
34 | */ | |
35 | protected TargetNodeComponent fTargetNode = null; | |
36 | ||
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37 | // ------------------------------------------------------------------------ |
38 | // Operations | |
39 | // ------------------------------------------------------------------------ | |
40 | /* | |
41 | * (non-Javadoc) | |
4775bcbf | 42 | * @see org.eclipse.core.commands.AbstractHandler#isEnabled() |
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43 | */ |
44 | @Override | |
45 | public boolean isEnabled() { | |
eb1bab5b | 46 | |
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47 | // Get workbench page for the Control View |
48 | IWorkbenchPage page = getWorkbenchPage(); | |
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49 | if (page == null) { |
50 | return false; | |
51 | } | |
52 | ||
c56972bb | 53 | TargetNodeComponent node = null; |
bbb3538a | 54 | // Check if the node component is selected |
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55 | ISelection selection = page.getSelection(ControlView.ID); |
56 | if (selection instanceof StructuredSelection) { | |
57 | Object element = ((StructuredSelection) selection).getFirstElement(); | |
c56972bb | 58 | node = (element instanceof TargetNodeComponent) ? (TargetNodeComponent) element : null; |
eb1bab5b | 59 | } |
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60 | boolean isEnabled = node != null; |
61 | fLock.lock(); | |
62 | try { | |
63 | if (isEnabled) { | |
64 | fTargetNode = node; | |
65 | } | |
66 | } finally { | |
67 | fLock.unlock(); | |
68 | } | |
69 | return isEnabled; | |
eb1bab5b | 70 | } |
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71 | |
72 | ||
eb1bab5b | 73 | } |