org.eclipse.linuxtools.lttng2.ui/src/org/eclipse/linuxtools/internal/lttng2/ui/views/control/handlers/AddContextOnEventHandler.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.Iterator;
  15 import java.util.List;
  16
  17 import org.eclipse.core.commands.ExecutionException;
  18 import org.eclipse.core.runtime.IProgressMonitor;
  19 import org.eclipse.jface.viewers.ISelection;
  20 import org.eclipse.jface.viewers.StructuredSelection;
  21 import org.eclipse.linuxtools.internal.lttng2.core.control.model.TraceSessionState;
  22 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.ControlView;
  23 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.model.impl.TraceEventComponent;
  24 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.model.impl.TraceSessionComponent;
  25 import org.eclipse.ui.IWorkbenchPage;
  26
  27 /**
  28  * <p>
  29  * Command handler implementation to add contexts to a given event.
  30  * </p>
  31  *
  32  * @author Bernd Hufmann
  33  */
  34 public class AddContextOnEventHandler extends BaseAddContextHandler {
  35
  36     // ------------------------------------------------------------------------
  37     // Attributes
  38     // ------------------------------------------------------------------------
  39
  40     // ------------------------------------------------------------------------
  41     // Operations
  42     // ------------------------------------------------------------------------
  43     /*
  44      * (non-Javadoc)
  45      * @see org.eclipse.linuxtools.internal.lttng2.ui.views.control.handlers.BaseAddContextHandler#addContexts(org.eclipse.linuxtools.internal.lttng2.ui.views.control.handlers.CommandParameter, java.util.List, org.eclipse.core.runtime.IProgressMonitor)
  46      */
  47     @Override
  48     public void addContexts(CommandParameter param, List<String> contextNames, IProgressMonitor monitor) throws ExecutionException {
  49         if (param instanceof EventCommandParameter) {
  50             TraceEventComponent event = ((EventCommandParameter)param).getEvent();
  51             event.addContexts(contextNames, monitor);
  52         }
  53     }
  54
  55     /*
  56      * (non-Javadoc)
  57      * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
  58      */
  59     @Override
  60     public boolean isEnabled() {
  61         // Get workbench page for the Control View
  62         IWorkbenchPage page = getWorkbenchPage();
  63         if (page == null) {
  64             return false;
  65         }
  66
  67         TraceEventComponent event = null;
  68         TraceSessionComponent session = null;
  69         ISelection selection = page.getSelection(ControlView.ID);
  70         if (selection instanceof StructuredSelection) {
  71             StructuredSelection structered = ((StructuredSelection) selection);
  72             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
  73                 Object element = iterator.next();
  74                 if (element instanceof TraceEventComponent) {
  75                     // Add only if corresponding TraceSessionComponents is inactive and not destroyed
  76                     TraceEventComponent tmpEvent = (TraceEventComponent) element;
  77                     session = tmpEvent.getSession();
  78                     if(session.getSessionState() == TraceSessionState.INACTIVE && !session.isDestroyed()) {
  79                         event = tmpEvent;
  80                     }
  81                 }
  82             }
  83         }
  84
  85         boolean isEnabled = (event != null);
  86         fLock.lock();
  87         try {
  88             fParam = null;
  89             if(isEnabled) {
  90                 fParam = new EventCommandParameter(session, event);
  91             }
  92         } finally {
  93             fLock.unlock();
  94         }
  95         return isEnabled;
  96     }
  97 }