org.eclipse.linuxtools.lttng2.ui/src/org/eclipse/linuxtools/internal/lttng2/ui/views/control/handlers/DeleteHandler.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 org.eclipse.core.commands.ExecutionEvent;
  15 import org.eclipse.core.commands.ExecutionException;
  16 import org.eclipse.linuxtools.internal.lttng2.core.control.model.TargetNodeState;
  17 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.model.ITraceControlComponent;
  18
  19 /**
  20  * <p>
  21  * Command handler implementation to delete a target host.
  22  * </p>
  23  *
  24  * @author Bernd Hufmann
  25  */
  26 public class DeleteHandler extends BaseNodeHandler {
  27
  28     // ------------------------------------------------------------------------
  29     // Operations
  30     // ------------------------------------------------------------------------
  31     /*
  32      * (non-Javadoc)
  33      * @see org.eclipse.linuxtools.internal.lttng2.ui.views.control.handlers.BaseNodeHandler#execute(org.eclipse.core.commands.ExecutionEvent)
  34      */
  35     @Override
  36     public Object execute(ExecutionEvent event) throws ExecutionException {
  37         fLock.lock();
  38         try {
  39             ITraceControlComponent root = fTargetNode.getParent();
  40             fTargetNode.removeAllChildren();
  41             fTargetNode.deregister();
  42             root.removeChild(fTargetNode);
  43         } finally {
  44             fLock.unlock();
  45         }
  46         return null;
  47     }
  48
  49     /*
  50      * (non-Javadoc)
  51      * @see org.eclipse.linuxtools.internal.lttng2.ui.views.control.handlers.BaseNodeHandler#isEnabled()
  52      */
  53     @Override
  54     public boolean isEnabled() {
  55         boolean isEnabled = false;
  56         fLock.lock();
  57         try {
  58            isEnabled = (super.isEnabled() && (fTargetNode.getTargetNodeState() == TargetNodeState.DISCONNECTED));
  59         } finally {
  60             fLock.unlock();
  61         }
  62         return isEnabled;
  63      }
  64 }