org.eclipse.linuxtools.lttng2.ui/src/org/eclipse/linuxtools/internal/lttng2/ui/views/control/handlers/BaseControlViewHandler.java

   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  **********************************************************************/
  12 package org.eclipse.linuxtools.internal.lttng2.ui.views.control.handlers;
  13
  14 import java.util.concurrent.locks.ReentrantLock;
  15
  16 import org.eclipse.core.commands.AbstractHandler;
  17 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.ControlView;
  18 import org.eclipse.ui.IWorkbenchPage;
  19 import org.eclipse.ui.IWorkbenchPart;
  20 import org.eclipse.ui.IWorkbenchWindow;
  21 import org.eclipse.ui.PlatformUI;
  22
  23 /**
  24  * <b><u>BaseControlViewHandler</u></b>
  25  * <p>
  26  * Abstract Command handler implementation for all control view handlers.
  27  * </p>
  28  */
  29 abstract public class BaseControlViewHandler extends AbstractHandler {
  30
  31     // ------------------------------------------------------------------------
  32     // Attributes
  33     // ------------------------------------------------------------------------
  34     /**
  35      * The synchronization lock.
  36      */
  37     protected ReentrantLock fLock = new ReentrantLock();
  38
  39     // ------------------------------------------------------------------------
  40     // Operations
  41     // ------------------------------------------------------------------------
  42     /**
  43      * @return returns the workbench page for the Control View
  44      */
  45     protected IWorkbenchPage getWorkbenchPage() {
  46         // Check if we are closing down
  47         IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  48         if (window == null) {
  49             return null;
  50         }
  51
  52         // Check if we are in the Project View
  53         IWorkbenchPage page = window.getActivePage();
  54         if (page == null) {
  55             return null;
  56         }
  57
  58         IWorkbenchPart part = page.getActivePart();
  59         if (!(part instanceof ControlView)) {
  60             return null;
  61         }
  62         return page;
  63     }
  64 }