1 /* 2 * Copyright (c) 2010, 2013, 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 26 package jdk.nashorn.internal.runtime.arrays; 27 28 import java.util.NoSuchElementException; 29 import jdk.nashorn.internal.runtime.JSType; 30 import jdk.nashorn.internal.runtime.ScriptObject; 31 32 /** 33 * Iterator over a map 34 */ 35 class MapIterator extends ArrayLikeIterator<Object> { 36 37 protected final ScriptObject obj; 38 private final long length; 39 40 MapIterator(final ScriptObject obj, final boolean includeUndefined) { 41 super(includeUndefined); 42 this.obj = obj; 43 this.length = JSType.toUint32(obj.getLength()); 44 this.index = 0; 45 } 46 47 protected boolean indexInArray() { 48 return index < length; 49 } 50 51 @Override 52 public int getLength() { 53 return (int) length; 54 } 55 56 @Override 57 public boolean hasNext() { 58 if (length == 0L) { 59 return false; //return empty string if toUint32(length) == 0 60 } 61 62 while (indexInArray()) { 63 if (obj.has(index) || includeUndefined) { 64 break; 65 } 66 bumpIndex(); 67 } 68 69 return indexInArray(); 70 } 71 72 @Override 73 public Object next() { 74 if (indexInArray()) { 75 return obj.get(bumpIndex()); 76 } 77 78 throw new NoSuchElementException(); 79 } 80 }