DefaultBlockFactory.java :  » Testing » jacareto » jacareto » trackimpl » blockimpl » Java Open Source

/*
 * Jacareto Copyright (c) 2002-2005
 * Applied Computer Science Research Group, Darmstadt University of
 * Technology, Institute of Mathematics & Computer Science,
 * Ludwigsburg University of Education, and Computer Based
 * Learning Research Group, Aachen University. All rights reserved.
 *
 * Jacareto is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * Jacareto is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with Jacareto; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

package jacareto.trackimpl.blockimpl;


import jacareto.record.AudioClipRecordable;
import jacareto.record.Recordable;
import jacareto.record.VideoClipRecordable;
import jacareto.track.block.Block;
import jacareto.track.block.BlockFactory;

import org.apache.commons.lang.Validate;

/**
 * <p>
 * Implementation of the {@link BlockFactory} interface
 * </p>
 *
 * @author Oliver Specht
 * @version $revision$
 */
public class DefaultBlockFactory implements BlockFactory {
    /** The static instance */
    private static final DefaultBlockFactory INSTANCE = new DefaultBlockFactory();

    private DefaultBlockFactory () {
    }

    /**
     * Returns the DefaultBlockFactory instance.
     *
     * @return DefaultBlockFactory
     */
    public static DefaultBlockFactory getInstance () {
        if (DefaultBlockFactory.INSTANCE == null) {
            return new DefaultBlockFactory();
        }

        return DefaultBlockFactory.INSTANCE;
    }

    /**
     * {@inheritDoc}
     */
    public Block createCustomBlock (Recordable element) {
        Validate.notNull (element);

        if (element instanceof AudioClipRecordable) {
            return new AudioBlock(element);
        } else if (element instanceof VideoClipRecordable) {
            return new VideoBlock(element);
        } else {
            return new EventBlock(element);
        }
    }

    /**
     * {@inheritDoc}
     */
    public Block createAudioBlock (AudioClipRecordable audioClip) {
        return new AudioBlock(audioClip);
    }

    /**
     * {@inheritDoc}
     */
    public Block createVideoBlock (VideoClipRecordable videoClip) {
        return new VideoBlock(videoClip);
    }

    /**
     * {@inheritDoc}
     */
    public Block createEventBlock (Recordable recordable) {
        return new EventBlock(recordable);
    }
}