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

   1 /**********************************************************************
   2  * Copyright (c) 2012, 2013 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     @Override
  45     public void addContexts(CommandParameter param, List<String> contextNames, IProgressMonitor monitor) throws ExecutionException {
  46         if (param instanceof EventCommandParameter) {
  47             TraceEventComponent event = ((EventCommandParameter)param).getEvent();
  48             event.addContexts(contextNames, monitor);
  49         }
  50     }
  51
  52     @Override
  53     public boolean isEnabled() {
  54         // Get workbench page for the Control View
  55         IWorkbenchPage page = getWorkbenchPage();
  56         if (page == null) {
  57             return false;
  58         }
  59
  60         TraceEventComponent event = null;
  61         TraceSessionComponent session = null;
  62         ISelection selection = page.getSelection(ControlView.ID);
  63         if (selection instanceof StructuredSelection) {
  64             StructuredSelection structered = ((StructuredSelection) selection);
  65             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
  66                 Object element = iterator.next();
  67                 if (element instanceof TraceEventComponent) {
  68                     // Add only if corresponding TraceSessionComponents is inactive and not destroyed
  69                     TraceEventComponent tmpEvent = (TraceEventComponent) element;
  70                     session = tmpEvent.getSession();
  71                     if(session.getSessionState() == TraceSessionState.INACTIVE && !session.isDestroyed()) {
  72                         event = tmpEvent;
  73                     }
  74                 }
  75             }
  76         }
  77
  78         boolean isEnabled = (event != null);
  79         fLock.lock();
  80         try {
  81             fParam = null;
  82             if(isEnabled) {
  83                 fParam = new EventCommandParameter(session, event);
  84             }
  85         } finally {
  86             fLock.unlock();
  87         }
  88         return isEnabled;
  89     }
  90 }