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.demos.ml.linear.data;
031
032import java.util.ArrayList;
033import java.util.Iterator;
034import org.openimaj.ml.linear.data.DataGenerator;
035import org.openimaj.util.pair.IndependentPair;
036import org.openimaj.util.stream.AbstractStream;
037
038public class RepeatingDataStream<I, D> extends AbstractStream<IndependentPair<I,D>> {
039
040        private DataGenerator<I, D> dg;
041        private int total;
042        private ArrayList<IndependentPair<I, D>> items;
043        private Iterator<IndependentPair<I, D>> innerIter;
044
045        public RepeatingDataStream(DataGenerator<I,D> dg,int totalDataItems) {
046                this.dg = dg;
047                this.total = totalDataItems;
048                this.items = new ArrayList<IndependentPair<I,D>>();
049                
050                for (int i = 0; i < total; i++) {
051                        items.add(dg.generate());
052                }
053                refresh();
054        }
055
056        @Override
057        public boolean hasNext() {
058                return true;
059        }
060
061        @Override
062        public IndependentPair<I, D> next() {
063                if(!innerIter.hasNext()) refresh();
064                return innerIter.next();
065        }
066
067        private void refresh() {
068                this.innerIter = this.items.iterator();
069        }
070
071}