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