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 java.util.ArrayList;
033import java.util.List;
034
035import org.openimaj.util.function.Function;
036import org.openimaj.util.function.Predicate;
037
038/**
039 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
040 * Apply a {@link Function} typed on IN and OUT to each item of a List<IN> to produce
041 * a List<OUT>
042 * @param <IN>
043 * @param <META>
044 */
045public class WindowFilter<IN,META> implements Function<Window<IN,META>,Window<IN,META>>{
046
047        private Predicate<IN> pred;
048
049        /**
050         * @param pred
051         */
052        public WindowFilter(Predicate<IN> pred) {
053                this.pred = pred;
054        }
055
056        @Override
057        public Window<IN,META> apply(Window<IN,META> in) {
058                List<IN> ret = new ArrayList<IN>();
059                for (IN usmfStatus : in.getPayload()) {
060                        if(pred.test(usmfStatus)) ret.add(usmfStatus);
061                }
062                return new Window<IN, META>(in.getMeta(), ret);
063        }
064
065
066
067}