001/*- 002 * Copyright 2015, 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 of pairs with output. For speed, there are public members. Note, index is not updated 016 */ 017public abstract class BroadcastIterator extends BroadcastIteratorBase { 018 019 public static BroadcastIterator createIterator(Dataset a, Dataset b) { 020 return createIterator(a, b, null, false); 021 } 022 023 public static BroadcastIterator createIterator(Dataset a, Dataset b, Dataset o) { 024 return createIterator(a, b, o, false); 025 } 026 027 public static BroadcastIterator createIterator(Dataset a, Dataset b, Dataset o, boolean createIfNull) { 028 if (Arrays.equals(a.getShapeRef(), b.getShapeRef()) && a.getStrides() == null && b.getStrides() == null) { 029 if (o == null || (o.getStrides() == null && Arrays.equals(a.getShapeRef(), o.getShapeRef()))) { 030 return new ContiguousPairIterator(a, b, o, createIfNull); 031 } 032 } 033 return new BroadcastPairIterator(a, b, o, createIfNull); 034 } 035 036 /** 037 * Index in output dataset 038 */ 039 public int oIndex; 040 /** 041 * Current value in first dataset 042 */ 043 public double aDouble; 044 /** 045 * Current value in first dataset 046 */ 047 public long aLong; 048 /** 049 * Output dataset 050 */ 051 protected Dataset oDataset; 052 053 final protected boolean outputA; 054 final protected boolean outputB; 055 056 protected BroadcastIterator(Dataset a, Dataset b, Dataset o) { 057 super(a, b); 058 oDataset = o; 059 outputA = a == o; 060 outputB = b == o; 061 read = DTypeUtils.isDTypeNumerical(a.getDType()) && DTypeUtils.isDTypeNumerical(b.getDType()); 062 asDouble = aDataset.hasFloatingPointElements() || bDataset.hasFloatingPointElements(); 063 BroadcastUtils.checkItemSize(a, b, o); 064 } 065 066 /** 067 * @return output dataset (can be null) 068 */ 069 public Dataset getOutput() { 070 return oDataset; 071 } 072 073 @Override 074 protected void storeCurrentValues() { 075 if (aIndex >= 0) { 076 if (asDouble) { 077 aDouble = aDataset.getElementDoubleAbs(aIndex); 078 } else { 079 aLong = aDataset.getElementLongAbs(aIndex); 080 } 081 } 082 if (bIndex >= 0) { 083 if (asDouble) { 084 bDouble = bDataset.getElementDoubleAbs(bIndex); 085 } else { 086 bLong = bDataset.getElementLongAbs(bIndex); 087 } 088 } 089 } 090}