1 /*******************************************************************************
2  * Copyright (c) 2000, 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 package org.eclipse.jdt.internal.debug.ui.actions;
15 
16 import org.eclipse.debug.core.DebugException;
17 import org.eclipse.jdt.debug.core.IJavaThread;
18 import org.eclipse.jdt.debug.ui.IJavaDebugUIConstants;
19 
20 /**
21  * An action delegate that toggles the state of its viewer to
22  * show/hide System Threads.
23  */
24 public class ShowSystemThreadsAction extends AbstractThreadsViewFilterAction {
25 
26 	@Override
getPreferenceKey()27 	protected String getPreferenceKey() {
28 		return IJavaDebugUIConstants.PREF_SHOW_SYSTEM_THREADS;
29 	}
30 
31 	@Override
selectThread(IJavaThread thread)32 	protected boolean selectThread(IJavaThread thread) throws DebugException {
33 		// Show only non-system threads and suspended threads.
34 		return !thread.isSystemThread() || thread.isSuspended();
35 	}
36 
37 	@Override
isCandidateThread(IJavaThread thread)38 	protected boolean isCandidateThread(IJavaThread thread) throws DebugException {
39 		return thread.isSystemThread();
40 	}
41 }
42