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/*******************************************************************************
* Copyright (c) 2008, 2012 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.ui.internal.jface;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jpt.common.ui.internal.util.SWTUtil;
import org.eclipse.jpt.common.ui.jface.ItemExtendedLabelProviderFactory;
import org.eclipse.jpt.common.ui.jface.ItemTreeContentProvider;
import org.eclipse.jpt.common.ui.jface.ItemTreeContentProviderFactory;
import org.eclipse.jpt.common.ui.jface.TreeStateProvider;
import org.eclipse.jpt.common.utility.internal.RunnableAdapter;
/**
* @see AbstractItemStructuredStateProviderManager
* @see ItemTreeContentProvider
*/
public class ItemTreeStateProviderManager
extends AbstractItemStructuredStateProviderManager<TreeViewer, ItemTreeContentProvider>
implements TreeStateProvider, ItemTreeContentProvider.Manager
{
/**
* Never <code>null</code>.
*/
protected final ItemTreeContentProviderFactory itemContentProviderFactory;
public ItemTreeStateProviderManager(ItemTreeContentProviderFactory itemContentProviderFactory) {
this(itemContentProviderFactory, null);
}
public ItemTreeStateProviderManager(ItemTreeContentProviderFactory itemContentProviderFactory, ItemExtendedLabelProviderFactory itemLabelProviderFactory) {
super(itemLabelProviderFactory);
if (itemContentProviderFactory == null) {
throw new NullPointerException();
}
this.itemContentProviderFactory = itemContentProviderFactory;
}
// ********** tree content provider **********
public boolean hasChildren(Object element) {
ItemTreeContentProvider provider = this.getItemContentProvider(element);
return (provider != null) && provider.hasChildren();
}
public Object[] getChildren(Object parentElement) {
ItemTreeContentProvider provider = this.getItemContentProvider(parentElement);
return (provider == null) ? EMPTY_ARRAY : provider.getChildren();
}
public Object getParent(Object element) {
ItemTreeContentProvider provider = this.getItemContentProvider(element);
return (provider == null) ? null : provider.getParent();
}
@Override
protected ItemTreeContentProvider buildItemContentProvider(Object item) {
return this.itemContentProviderFactory.buildProvider(item, this);
}
// ********** update children **********
/**
* Dispatch to the UI thread.
*/
public void updateChildren(Object inputElement) {
SWTUtil.execute(this.viewer, new UpdateChildrenRunnable(inputElement));
}
/* CU private */ class UpdateChildrenRunnable
extends RunnableAdapter
{
private final Object element;
UpdateChildrenRunnable(Object element) {
super();
this.element = element;
}
@Override
public void run() {
ItemTreeStateProviderManager.this.updateChildren_(this.element);
}
}
/**
* Update the specified item's children.
*/
/* CU private */ void updateChildren_(Object element) {
if (this.viewerIsAlive()) {
this.viewer.refresh(element, false);
}
}
}
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