org.eclipse.tracecompass.lttng2.control.ui/src/org/eclipse/tracecompass/internal/lttng2/control/ui/views/handlers/RefreshHandler.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
  16 import org.eclipse.core.commands.ExecutionEvent;
  17 import org.eclipse.core.commands.ExecutionException;
  18 import org.eclipse.jface.viewers.ISelection;
  19 import org.eclipse.jface.viewers.StructuredSelection;
  20 import org.eclipse.tracecompass.internal.lttng2.control.core.model.TargetNodeState;
  21 import org.eclipse.tracecompass.internal.lttng2.control.ui.views.ControlView;
  22 import org.eclipse.tracecompass.internal.lttng2.control.ui.views.model.impl.TargetNodeComponent;
  23 import org.eclipse.tracecompass.internal.lttng2.control.ui.views.model.impl.TraceControlComponent;
  24 import org.eclipse.ui.IWorkbenchPage;
  25
  26 /**
  27  * <p>
  28  * Command handler implementation to refresh node configuration.
  29  * </p>
  30  *
  31  * @author Bernd Hufmann
  32  */
  33 public class RefreshHandler extends BaseControlViewHandler {
  34
  35     // ------------------------------------------------------------------------
  36     // Attributes
  37     // ------------------------------------------------------------------------
  38
  39     /**
  40      * The node component reference.
  41      */
  42     private TargetNodeComponent fNode;
  43
  44     // ------------------------------------------------------------------------
  45     // Operations
  46     // ------------------------------------------------------------------------
  47
  48     @Override
  49     public Object execute(ExecutionEvent event) throws ExecutionException {
  50         fLock.lock();
  51         try {
  52             fNode.refresh();
  53         } finally {
  54             fLock.unlock();
  55         }
  56         return null;
  57     }
  58
  59     @Override
  60     public boolean isEnabled() {
  61
  62         // Get workbench page for the Control View
  63         IWorkbenchPage page = getWorkbenchPage();
  64         if (page == null) {
  65             return false;
  66         }
  67
  68         TargetNodeComponent node = null;
  69         // Check if one or more session are selected
  70         ISelection selection = page.getSelection(ControlView.ID);
  71         if (selection instanceof StructuredSelection) {
  72
  73             StructuredSelection structered = ((StructuredSelection) selection);
  74             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
  75                 Object element = iterator.next();
  76                 if (element instanceof TraceControlComponent) {
  77                     TraceControlComponent component = (TraceControlComponent) element;
  78                     boolean isConnected = component.getTargetNodeState() == TargetNodeState.CONNECTED;
  79                     if (isConnected) {
  80                         while ((component != null) && component.getClass() != TargetNodeComponent.class) {
  81                             component = (TraceControlComponent) component.getParent();
  82                         }
  83                         if (component != null) {
  84                             node = (TargetNodeComponent) component;
  85                         }
  86                     }
  87                 }
  88             }
  89         }
  90
  91         boolean isEnabled = node != null;
  92
  93         fLock.lock();
  94         try {
  95             fNode = null;
  96             if (isEnabled) {
  97                 fNode = node;
  98             }
  99         } finally {
 100             fLock.unlock();
 101         }
 102
 103         return isEnabled;
 104     }
 105 }