| /******************************************************************************* |
| * 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<>(); |
| 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; |
| } |
| } |