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}