lttng/org.eclipse.tracecompass.lttng2.control.ui/src/org/eclipse/tracecompass/internal/lttng2/control/ui/views/handlers/EnableChannelOnSessionHandler.java

   1 /**********************************************************************
   2  * Copyright (c) 2012, 2014 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.tracecompass.internal.lttng2.control.ui.views.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.tracecompass.internal.lttng2.control.core.model.IChannelInfo;
  22 import org.eclipse.tracecompass.internal.lttng2.control.core.model.TraceSessionState;
  23 import org.eclipse.tracecompass.internal.lttng2.control.ui.views.ControlView;
  24 import org.eclipse.tracecompass.internal.lttng2.control.ui.views.model.impl.TraceDomainComponent;
  25 import org.eclipse.tracecompass.internal.lttng2.control.ui.views.model.impl.TraceSessionComponent;
  26 import org.eclipse.ui.IWorkbenchPage;
  27
  28 /**
  29  * <p>
  30  * Command handler implementation to enable a trace channel for unknown domain
  31  * (on session level).
  32  * </p>
  33  *
  34  * @author Bernd Hufmann
  35  */
  36 public class EnableChannelOnSessionHandler extends BaseEnableChannelHandler {
  37
  38     // ------------------------------------------------------------------------
  39     // Attributes
  40     // ------------------------------------------------------------------------
  41
  42     @Override
  43     public void enableChannel(CommandParameter param, List<String> channelNames, IChannelInfo info, boolean isKernel, IProgressMonitor monitor) throws ExecutionException {
  44         param.getSession().enableChannels(channelNames, info, isKernel, monitor);
  45     }
  46
  47     @Override
  48     public TraceDomainComponent getDomain(CommandParameter param) {
  49         return null;
  50     }
  51
  52     // ------------------------------------------------------------------------
  53     // Operations
  54     // ------------------------------------------------------------------------
  55
  56     @Override
  57     public boolean isEnabled() {
  58         // Get workbench page for the Control View
  59         IWorkbenchPage page = getWorkbenchPage();
  60         if (page == null) {
  61             return false;
  62         }
  63
  64         TraceSessionComponent session = null;
  65         // Check if one session is selected
  66         ISelection selection = page.getSelection(ControlView.ID);
  67         if (selection instanceof StructuredSelection) {
  68             StructuredSelection structered = ((StructuredSelection) selection);
  69             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
  70                 Object element = iterator.next();
  71                 if (element instanceof TraceSessionComponent) {
  72                     // Add only TraceSessionComponents that are inactive and not destroyed
  73                     TraceSessionComponent tmpSession = (TraceSessionComponent) element;
  74                     if ((tmpSession.getSessionState() == TraceSessionState.INACTIVE) && (!tmpSession.isDestroyed())) {
  75                         session = tmpSession;
  76                     }
  77                 }
  78             }
  79         }
  80         boolean isEnabled = session != null;
  81
  82         fLock.lock();
  83         try {
  84             fParam = null;
  85             if (isEnabled) {
  86                 fParam = new CommandParameter(session);
  87             }
  88         } finally {
  89             fLock.unlock();
  90         }
  91
  92         return isEnabled;
  93     }
  94 }