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/*******************************************************************************
* Copyright (c) 2000, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Lars Vogel - Bug 487940
*******************************************************************************/
package org.eclipse.jface.viewers;
import java.util.Collection;
import org.eclipse.pde.api.tools.annotations.NoExtend;
/**
* This implementation of IStructuredContentProvider handles
* the case where the viewer input is an unchanging array or collection of elements.
*
* This class is not intended to be subclassed outside the viewer framework.
*
*
* @since 2.1
*/
@NoExtend
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
* Collection.
*/
@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];
}
}