org.eclipse.linuxtools.lttng2.ui/src/org/eclipse/linuxtools/internal/lttng2/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.internal.lttng2.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.internal.lttng2.core.control.model.TargetNodeState;
  21 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.ControlView;
  22 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.model.impl.TargetNodeComponent;
  23 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.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      * The node component reference.
  40      */
  41     private TargetNodeComponent fNode;
  42
  43     // ------------------------------------------------------------------------
  44     // Operations
  45     // ------------------------------------------------------------------------
  46
  47     /*
  48      * (non-Javadoc)
  49      * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
  50      */
  51     @Override
  52     public Object execute(ExecutionEvent event) throws ExecutionException {
  53         fLock.lock();
  54         try {
  55             fNode.refresh();
  56         } finally {
  57             fLock.unlock();
  58         }
  59         return null;
  60     }
  61
  62     /*
  63      * (non-Javadoc)
  64      * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
  65      */
  66     @Override
  67     public boolean isEnabled() {
  68
  69         // Get workbench page for the Control View
  70         IWorkbenchPage page = getWorkbenchPage();
  71         if (page == null) {
  72             return false;
  73         }
  74
  75         TargetNodeComponent node = null;
  76         // Check if one or more session are selected
  77         ISelection selection = page.getSelection(ControlView.ID);
  78         if (selection instanceof StructuredSelection) {
  79
  80             StructuredSelection structered = ((StructuredSelection) selection);
  81             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
  82                 Object element = iterator.next();
  83                 if (element instanceof TraceControlComponent) {
  84                     TraceControlComponent component = (TraceControlComponent) element;
  85                     boolean isConnected = component.getTargetNodeState() == TargetNodeState.CONNECTED;
  86                     if (isConnected) {
  87                         while ((component != null) && component.getClass() != TargetNodeComponent.class) {
  88                             component = (TraceControlComponent) component.getParent();
  89                         }
  90                         if (component != null) {
  91                             node = (TargetNodeComponent) component;
  92                         }
  93                     }
  94                 }
  95             }
  96         }
  97
  98         boolean isEnabled = node != null;
  99
 100         fLock.lock();
 101         try {
 102             fNode = null;
 103             if (isEnabled) {
 104                 fNode = node;
 105             }
 106         } finally {
 107             fLock.unlock();
 108         }
 109
 110         return isEnabled;
 111     }
 112 }