ArrayIterator.java revision 1626:d99fa86747ee
1/* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package jdk.nashorn.internal.objects; 27 28import jdk.nashorn.internal.objects.annotations.Function; 29import jdk.nashorn.internal.objects.annotations.ScriptClass; 30import jdk.nashorn.internal.runtime.JSType; 31import jdk.nashorn.internal.runtime.PropertyMap; 32import jdk.nashorn.internal.runtime.ScriptObject; 33import jdk.nashorn.internal.runtime.ScriptRuntime; 34import jdk.nashorn.internal.runtime.Undefined; 35 36import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; 37 38@ScriptClass("ArrayIterator") 39public class ArrayIterator extends AbstractIterator { 40 41 // initialized by nasgen 42 private static PropertyMap $nasgenmap$; 43 44 private ScriptObject iteratedObject; 45 private long nextIndex = 0L; 46 private final IterationKind iterationKind; 47 private final Global global; 48 49 50 ArrayIterator(final Object iteratedObject, final IterationKind iterationKind, final Global global) { 51 super(global.getArrayIteratorPrototype(), $nasgenmap$); 52 this.iteratedObject = iteratedObject instanceof ScriptObject ? (ScriptObject) iteratedObject : null; 53 this.iterationKind = iterationKind; 54 this.global = global; 55 } 56 57 /** 58 * 22.1.5.2.1 %ArrayIteratorPrototype%.next() 59 * 60 * @param self the self reference 61 * @param arg the argument 62 * @return the next result 63 */ 64 @Function 65 public static Object next(final Object self, final Object arg) { 66 if (!(self instanceof ArrayIterator)) { 67 throw typeError("not.a.array.iterator", ScriptRuntime.safeToString(self)); 68 } 69 return ((ArrayIterator)self).next(arg); 70 } 71 72 @Override 73 public String getClassName() { 74 return "Array Iterator"; 75 } 76 77 @Override 78 protected IteratorResult next(final Object arg) { 79 final long index = nextIndex; 80 81 if (iteratedObject == null || index >= JSType.toUint32(iteratedObject.getLength())) { 82 // ES6 22.1.5.2.1 step 10 83 iteratedObject = null; 84 return makeResult(Undefined.getUndefined(), Boolean.TRUE, global); 85 } 86 87 nextIndex++; 88 89 if (iterationKind == IterationKind.KEY_VALUE) { 90 final NativeArray value = new NativeArray( 91 new Object[] {JSType.toNarrowestNumber(index), iteratedObject.get((double) index)}); 92 return makeResult(value, Boolean.FALSE, global); 93 } 94 95 final Object value = iterationKind == IterationKind.KEY ? 96 JSType.toNarrowestNumber(index) : iteratedObject.get((double) index); 97 return makeResult(value, Boolean.FALSE, global); 98 } 99 100} 101