001/*-
002 * Copyright 2016 Diamond Light Source Ltd.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the Eclipse Public License v1.0
006 * which accompanies this distribution, and is available at
007 * http://www.eclipse.org/legal/epl-v10.html
008 */
009
010package org.eclipse.january.dataset;
011
012import java.util.Arrays;
013
014/**
015 * Base class for broadcast iterators where the second dataset could be broadcast to the first
016 * and it is also read into either bLong or bDouble fields.<p>
017 * For speed, there are public members. Note, index is not updated
018 */
019public abstract class BroadcastSelfIterator extends BroadcastIteratorBase {
020
021        public static BroadcastSelfIterator createIterator(Dataset a, Dataset b) {
022                if (Arrays.equals(a.getShapeRef(), b.getShapeRef()) && a.getStrides() == null && b.getStrides() == null) {
023                        return new ContiguousSingleIterator(a, b);
024                }
025                return new BroadcastSingleIterator(a, b);
026        }
027
028        protected BroadcastSelfIterator(Dataset a, Dataset b) {
029                super(a, b);
030                read = DTypeUtils.isDTypeNumerical(b.getDType());
031                asDouble = aDataset.hasFloatingPointElements();
032                BroadcastUtils.checkItemSize(a, b, null);
033        }
034
035        @Override
036        protected void storeCurrentValues() {
037                if (bIndex >= 0) {
038                        if (asDouble) {
039                                bDouble = bDataset.getElementDoubleAbs(bIndex);
040                        } else {
041                                bLong = bDataset.getElementLongAbs(bIndex);
042                        }
043                }
044        }
045}