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/*******************************************************************************
* Copyright (c) 2008, 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.viewers;
import java.util.ArrayList;
import java.util.Arrays;
import org.eclipse.core.runtime.*;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.equinox.internal.p2.ui.ProvUIMessages;
import org.eclipse.equinox.internal.p2.ui.model.ProvElement;
import org.eclipse.jface.viewers.*;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.progress.*;
/**
* Content provider that retrieves children of a ProvElement.
*
* @since 3.5
*
*/
public class ProvElementContentProvider implements ITreeContentProvider {
private boolean fetchInBackground = false;
Viewer viewer;
private Job fetchJob;
// family is used by test cases
Object fetchFamily = new Object();
/**
*
*/
public ProvElementContentProvider() {
// Default constructor
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
*/
@Override
public Object[] getElements(final Object input) {
// Simple deferred fetch handling for table viewers
if (fetchInBackground && input instanceof IDeferredWorkbenchAdapter && viewer instanceof AbstractTableViewer) {
final Display display = viewer.getControl().getDisplay();
final Object pending = new PendingUpdateAdapter();
if (fetchJob != null)
fetchJob.cancel();
fetchJob = new Job(ProvUIMessages.ProvElementContentProvider_FetchJobTitle) {
@Override
protected IStatus run(final IProgressMonitor monitor) {
IDeferredWorkbenchAdapter parent = (IDeferredWorkbenchAdapter) input;
final ArrayList<Object> children = new ArrayList<Object>();
parent.fetchDeferredChildren(parent, new IElementCollector() {
@Override
public void add(Object element, IProgressMonitor mon) {
if (mon.isCanceled())
return;
children.add(element);
}
@Override
public void add(Object[] elements, IProgressMonitor mon) {
if (mon.isCanceled())
return;
children.addAll(Arrays.asList(elements));
}
@Override
public void done() {
// nothing special to do
}
}, monitor);
if (!monitor.isCanceled()) {
display.asyncExec(new Runnable() {
@Override
public void run() {
AbstractTableViewer tableViewer = (AbstractTableViewer) viewer;
if (monitor.isCanceled() || tableViewer == null || tableViewer.getControl().isDisposed())
return;
tableViewer.getControl().setRedraw(false);
tableViewer.remove(pending);
tableViewer.add(children.toArray());
finishedFetchingElements(input);
tableViewer.getControl().setRedraw(true);
}
});
}
return Status.OK_STATUS;
}
@Override
public boolean belongsTo(Object family) {
return family == fetchFamily;
}
};
fetchJob.schedule();
return new Object[] {pending};
}
Object[] elements = getChildren(input);
finishedFetchingElements(input);
return elements;
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
*/
@Override
public Object getParent(Object child) {
if (child instanceof ProvElement) {
return ((ProvElement) child).getParent(child);
}
return null;
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
*/
@Override
public boolean hasChildren(Object element) {
if (element instanceof ProvElement)
return ((ProvElement) element).hasChildren(element);
return false;
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
*/
@Override
public Object[] getChildren(final Object parent) {
if (parent instanceof ProvElement) {
return ((ProvElement) parent).getChildren(parent);
}
return new Object[0];
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.IContentProvider#dispose()
*/
@Override
public void dispose() {
viewer = null;
if (fetchJob != null) {
fetchJob.cancel();
fetchJob = null;
}
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
*/
@Override
public void inputChanged(Viewer aViewer, Object oldInput, Object newInput) {
this.viewer = aViewer;
if (fetchJob != null) {
fetchJob.cancel();
fetchJob = null;
}
}
protected void finishedFetchingElements(Object parent) {
// do nothing
}
public void setFetchInBackground(boolean fetchInBackground) {
this.fetchInBackground = fetchInBackground;
}
}
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