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/*******************************************************************************
* 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();
}
}
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