001/* An operator for null sinks.
002 * 
003 * Copyright (c) 2014 The Regents of the University of California.
004 * All rights reserved.
005 *
006 * '$Author: crawl $'
007 * '$Date: 2014-09-24 20:40:21 +0000 (Wed, 24 Sep 2014) $' 
008 * '$Revision: 32967 $'
009 * 
010 * Permission is hereby granted, without written agreement and without
011 * license or royalty fees, to use, copy, modify, and distribute this
012 * software and its documentation for any purpose, provided that the above
013 * copyright notice and the following two paragraphs appear in all copies
014 * of this software.
015 *
016 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
017 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
018 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
019 * THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
020 * SUCH DAMAGE.
021 *
022 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
023 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
024 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
025 * PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
026 * CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
027 * ENHANCEMENTS, OR MODIFICATIONS.
028 *
029 */
030package org.kepler.spark.operator;
031
032import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
033import org.apache.spark.api.java.JavaPairRDD;
034
035/** A data sink that does not write to anything.
036 * 
037 *  @author Daniel Crawl
038 *  @version $Id: NullSink.java 32967 2014-09-24 20:40:21Z crawl $
039 */
040public class NullSink extends DataSink {
041
042    /** Create a new NullSink.
043     *  @param name the name of the operator  
044     */
045    public NullSink(String name) {
046        super(1, NullOutputFormat.class, name);
047    }
048    
049    /** Execute the operator. */
050    @Override
051    public JavaPairRDD<Object, ?> execute() {
052                
053        _inputData[0].saveAsNewAPIHadoopFile(System.getProperty("java.io.tmpdir"),
054                Object.class, Object.class, NullOutputFormat.class, _configuration);
055        return null;
056    }
057}