1 /**
2 * Copyright (c) 2011, The University of Southampton and the individual contributors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * * Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * * Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * * Neither the name of the University of Southampton nor the names of its
16 * contributors may be used to endorse or promote products derived from this
17 * software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 package org.openimaj.demos.ml.linear.data;
31
32 import java.util.ArrayList;
33 import java.util.Iterator;
34 import org.openimaj.ml.linear.data.DataGenerator;
35 import org.openimaj.util.pair.IndependentPair;
36 import org.openimaj.util.stream.AbstractStream;
37
38 public class RepeatingDataStream<I, D> extends AbstractStream<IndependentPair<I,D>> {
39
40 private DataGenerator<I, D> dg;
41 private int total;
42 private ArrayList<IndependentPair<I, D>> items;
43 private Iterator<IndependentPair<I, D>> innerIter;
44
45 public RepeatingDataStream(DataGenerator<I,D> dg,int totalDataItems) {
46 this.dg = dg;
47 this.total = totalDataItems;
48 this.items = new ArrayList<IndependentPair<I,D>>();
49
50 for (int i = 0; i < total; i++) {
51 items.add(dg.generate());
52 }
53 refresh();
54 }
55
56 @Override
57 public boolean hasNext() {
58 return true;
59 }
60
61 @Override
62 public IndependentPair<I, D> next() {
63 if(!innerIter.hasNext()) refresh();
64 return innerIter.next();
65 }
66
67 private void refresh() {
68 this.innerIter = this.items.iterator();
69 }
70
71 }