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 and it is also read into either bLong or bDouble fields.
016 * For speed, there are public members. Note, index is not updated
017 */
018public abstract class BroadcastSelfIterator extends BroadcastIteratorBase {
019
020        public static BroadcastSelfIterator createIterator(Dataset a, Dataset b) {
021                if (Arrays.equals(a.getShapeRef(), b.getShapeRef()) && a.getStrides() == null && b.getStrides() == null) {
022                        return new ContiguousSingleIterator(a, b);
023                }
024                return new BroadcastSingleIterator(a, b);
025        }
026
027        protected BroadcastSelfIterator(Dataset a, Dataset b) {
028                super(a, b);
029                read = DTypeUtils.isDTypeNumerical(b.getDType());
030                asDouble = aDataset.hasFloatingPointElements();
031                BroadcastUtils.checkItemSize(a, b, null);
032        }
033
034        @Override
035        protected void storeCurrentValues() {
036                if (bIndex >= 0) {
037                        if (asDouble) {
038                                bDouble = bDataset.getElementDoubleAbs(bIndex);
039                        } else {
040                                bLong = bDataset.getElementLongAbs(bIndex);
041                        }
042                }
043        }
044}