/*******************************************************************************
* Copyright (c) 2000, 2016 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
* Lars Vogel <Lars.Vogel@vogella.com> - Bug 487940
*******************************************************************************/
package org.eclipse.jface.viewers;
import java.util.Collection;
/**
* This implementation of <code>IStructuredContentProvider</code> handles
* the case where the viewer input is an unchanging array or collection of elements.
* <p>
* This class is not intended to be subclassed outside the viewer framework.
* </p>
*
* @since 2.1
* @noextend This class is not intended to be subclassed by clients.
*/
public class ArrayContentProvider implements IStructuredContentProvider {
private static ArrayContentProvider instance;
/**
* Returns an instance of ArrayContentProvider. Since instances of this
* class do not maintain any state, they can be shared between multiple
* clients.
*
* @return an instance of ArrayContentProvider
*
* @since 3.5
*/
public static ArrayContentProvider getInstance() {
synchronized(ArrayContentProvider.class) {
if (instance == null) {
instance = new ArrayContentProvider();
}
return instance;
}
}
/**
* Returns the elements in the input, which must be either an array or a
* <code>Collection</code>.
*/
@Override
public Object[] getElements(Object inputElement) {
if (inputElement instanceof Object[]) {
return (Object[]) inputElement;
}
if (inputElement instanceof Collection) {
return ((Collection) inputElement).toArray();
}
return new Object[0];
}
}