001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.util.stream.window;
031
032import org.openimaj.util.function.Function;
033import org.openimaj.util.pair.IndependentPair;
034
035/**
036 * Given a combined stream (i.e. a stream of {@link IndependentPair} instances)
037 * apply two functions (one to each compo
038 * 
039 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
040 * 
041 * @param <AIN>
042 *            The first part of the input pair
043 * @param <BIN>
044 *            The second part of the input pair
045 * 
046 * @param <AOUT>
047 *            The first part of the output pair
048 * @param <BOUT>
049 *            The second part of the output pair
050 * @param <AM>
051 * @param <BM>
052 * 
053 */
054public class CombinedMetaPayloadFunction<AIN, AOUT, BIN, BOUT, AM, BM> implements Function<
055                MetaPayload<IndependentPair<AIN, BIN>, IndependentPair<AM, BM>>,
056                MetaPayload<IndependentPair<AOUT, BOUT>, IndependentPair<AM, BM>>
057                >
058{
059
060        private Function<MetaPayload<AIN, AM>, MetaPayload<AOUT, AM>> fA;
061        private Function<MetaPayload<BIN, BM>, MetaPayload<BOUT, BM>> fB;
062
063        /**
064         * @param fA
065         * @param fB
066         */
067        public CombinedMetaPayloadFunction(Function<MetaPayload<AIN, AM>, MetaPayload<AOUT, AM>> fA,
068                        Function<MetaPayload<BIN, BM>, MetaPayload<BOUT, BM>> fB)
069        {
070                this.fA = fA;
071                this.fB = fB;
072        }
073
074        @Override
075        public MetaPayload<IndependentPair<AOUT, BOUT>, IndependentPair<AM, BM>> apply(
076                        MetaPayload<IndependentPair<AIN, BIN>, IndependentPair<AM, BM>> inaggr)
077        {
078                final IndependentPair<AIN, BIN> in = inaggr.getPayload();
079                final IndependentPair<AM, BM> meta = inaggr.getMeta();
080
081                final MetaPayload<AIN, AM> aggra = new MetaPayload<AIN, AM>(in.firstObject(), meta.firstObject());
082                final MetaPayload<BIN, BM> aggrb = new MetaPayload<BIN, BM>(in.secondObject(), meta.secondObject());
083                final IndependentPair<MetaPayload<AOUT, AM>, MetaPayload<BOUT, BM>> pair = IndependentPair.pair(fA.apply(aggra),
084                                fB.apply(aggrb));
085                final IndependentPair<AOUT, BOUT> outP = IndependentPair.pair(pair.firstObject().getPayload(), pair
086                                .secondObject().getPayload());
087                final IndependentPair<AM, BM> outM = IndependentPair.pair(pair.firstObject().getMeta(), pair.secondObject()
088                                .getMeta());
089                return new MetaPayload<IndependentPair<AOUT, BOUT>, IndependentPair<AM, BM>>(outP, outM);
090        }
091
092}