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}