| /******************************************************************************* |
| * Copyright (c) 2007, 2010 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.ui.model; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.OperationCanceledException; |
| import org.eclipse.core.runtime.jobs.ISchedulingRule; |
| import org.eclipse.equinox.internal.p2.ui.QueryableMetadataRepositoryManager; |
| import org.eclipse.ui.progress.IDeferredWorkbenchAdapter; |
| import org.eclipse.ui.progress.IElementCollector; |
| |
| /** |
| * Element wrapper class for objects that gets their children using |
| * a deferred query. |
| * |
| * @since 3.4 |
| */ |
| public abstract class RemoteQueriedElement extends QueriedElement implements IDeferredWorkbenchAdapter { |
| |
| protected RemoteQueriedElement(Object parent) { |
| super(parent); |
| } |
| |
| @Override |
| public void fetchDeferredChildren(Object o, IElementCollector collector, IProgressMonitor monitor) { |
| try { |
| Object[] children = fetchChildren(o, monitor); |
| for (Object child : children) { |
| if (child instanceof CategoryElement) { |
| ((CategoryElement) child).fetchChildren(child, monitor); |
| } |
| } |
| if (!monitor.isCanceled()) { |
| collector.add(children, monitor); |
| } |
| } catch (OperationCanceledException e) { |
| // Nothing to do |
| } |
| collector.done(); |
| } |
| |
| @Override |
| public ISchedulingRule getRule(Object object) { |
| return null; |
| } |
| |
| @Override |
| public boolean isContainer() { |
| return true; |
| } |
| |
| /* |
| * Overridden to ensure that we check whether we are using a |
| * QueryableMetadataRepositoryManager as our queryable. If so, |
| * we must find out if it is up to date with the real manager. |
| * |
| * This is necessary to prevent background loading of already loaded repositories |
| * by the DeferredTreeContentManager, which will add redundant children to the |
| * viewer. |
| * see https://bugs.eclipse.org/bugs/show_bug.cgi?id=229069 |
| * see https://bugs.eclipse.org/bugs/show_bug.cgi?id=226343 |
| * see https://bugs.eclipse.org/bugs/show_bug.cgi?id=275235 |
| * (non-Javadoc) |
| * @see org.eclipse.equinox.internal.provisional.p2.ui.query.QueriedElement#hasQueryable() |
| */ |
| |
| @Override |
| public boolean hasQueryable() { |
| if (queryable instanceof QueryableMetadataRepositoryManager) |
| return ((QueryableMetadataRepositoryManager) queryable).areRepositoriesLoaded(); |
| return super.hasQueryable(); |
| } |
| |
| } |