org.eclipse.jface.viewers.ArrayContentProvider.java Source code

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Here is the source code for org.eclipse.jface.viewers.ArrayContentProvider.java

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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 <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];
    }
}