* David McKnight (IBM)          - [204684] CheckExistsJob used for determining if a remote object exists after a query of it's children

import org.eclipse.swt.widgets.Display;

		/**

		 * For bug 204684: 

		 * 

		 * Because we don't have an API for ISystemViewElementAdapter.exists()...

		 * This class is used to determine whether an object exists and consequently whether to remove it from the view

		 * after a query comes back with either no children or a SystemMessageObject.  We query the parent to determine

		 * whether the remote object exists - in that case we just leave the message as is in the view.  In the case where

		 * we detect that the object does not exist, we re-populate the parent node with the new children.

		 */

		public class CheckExistenceJob extends Job

		{

			private IAdaptable _remoteObject;

			private TreeItem _parentItem;

			private IContextObject _context;

			public CheckExistenceJob(IAdaptable remoteObject, TreeItem parentItem, IContextObject context)

			{

				super("Check existence"); //$NON-NLS-1$

				_remoteObject = remoteObject;

				_parentItem = parentItem;

				_context = context;

			}

			public IStatus run(IProgressMonitor monitor)

			{				

				ISystemViewElementAdapter adapter = (ISystemViewElementAdapter)_remoteObject.getAdapter(ISystemViewElementAdapter.class);

				if (adapter != null)

				{

					final Object[] children =  adapter.getChildren(_context, monitor);

					if (contains(children, _remoteObject))

					{

						// we want to end this so the user sees the error message

					}

					else

					{

						Display.getDefault().asyncExec(new Runnable(){

							public void run()

							{

								/*

								// first need to remove the old items

								TreeItem[] items = _parentItem.getItems();

								for (int i = 0; i < items.length; i++) {

									if (items[i].getData() != null) {

										disassociate(items[i]);

										items[i].dispose();

									} else {

										items[i].dispose();

										}

									}

								// we want to propagate the changes to the view

								add(_context.getModelObject(), children);

								*/

								// refresh using the event since other views may need updating

								IAdaptable par = _context.getModelObject();

								ISystemRegistry sr = RSECorePlugin.getTheSystemRegistry();

								sr.fireEvent(new SystemResourceChangeEvent(par, ISystemResourceChangeEvents.EVENT_REFRESH_REMOTE, null));

							}		

						});

					}

				}

				return Status.OK_STATUS;

			}

			private boolean contains(Object[] children, IAdaptable remoteObject)

			{

				ISystemViewElementAdapter adapter1 = (ISystemViewElementAdapter)remoteObject.getAdapter(ISystemViewElementAdapter.class);

				if (adapter1 != null)

				{

					String path1 = adapter1.getAbsoluteName(remoteObject);

					for (int i = 0; i < children.length; i++)

					{

						if (children[i] == remoteObject)

						{

							return true;

						}

						else if (children[i] instanceof IAdaptable)

						{

							IAdaptable remoteObject2 = (IAdaptable)children[i];

							ISystemViewElementAdapter adapter2 = (ISystemViewElementAdapter)remoteObject2.getAdapter(ISystemViewElementAdapter.class);

							if (adapter2 != null)

							{

								String path2 = adapter2.getAbsoluteName(remoteObject2);

								if (path1 != null && path2 != null && path1.equals(path2))

								{

									return true;

								}

							}

						}

					}

				}

				return false;

			}

		}