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 }
--- EOF ---