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