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/*******************************************************************************
* Copyright (c) 2006, 2008 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.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
/**
* Null implementation of the ILabelProvider interface.
* Implemented as a singleton.
*/
public final class NullTreeContentProvider
implements ITreeContentProvider
{
private static final Object[] EMPTY_ARRAY = new Object[0];
public static final NullTreeContentProvider INSTANCE = new NullTreeContentProvider();
public static ITreeContentProvider instance() {
return INSTANCE;
}
/**
* Ensure a single instance.
*/
private NullTreeContentProvider() {
super();
}
public Object[] getChildren(Object parentElement) {
return EMPTY_ARRAY;
}
public Object getParent(Object element) {
return null;
}
public boolean hasChildren(Object element) {
return false;
}
public Object[] getElements(Object inputElement) {
return EMPTY_ARRAY;
}
public void dispose() {
// do nothing
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
// do nothing
}
}
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