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 jdk.nashorn.internal.runtime.ScriptObject;
  29 
  30 /**
  31  * Iterator over a NativeArray
  32  */
  33 class ScriptArrayIterator extends ArrayLikeIterator<Object> {
  34 
  35     /** Array {@link ScriptObject} to iterate over */
  36     protected final ScriptObject array;
  37 
  38     /** length of array */
  39     protected final long length;
  40 
  41     /**
  42      * Constructor
  43      * @param array array to iterate over
  44      * @param includeUndefined should undefined elements be included in iteration
  45      */
  46     protected ScriptArrayIterator(final ScriptObject array, final boolean includeUndefined) {
  47         super(includeUndefined);
  48         this.array = array;
  49         this.length = array.getArray().length();
  50     }
  51 
  52     /**
  53      * Is the current index still inside the array
  54      * @return true if inside the array
  55      */
  56     protected boolean indexInArray() {
  57         return index < length;
  58     }
  59 
  60     @Override
  61     public Object next() {
  62         return array.get(bumpIndex());
  63     }
  64 
  65     @Override
  66     public long getLength() {
  67         return length;
  68     }
  69 
  70     @Override
  71     public boolean hasNext() {
  72         if (!includeUndefined) {
  73             while (indexInArray()) {
  74                 if (array.has(index)) {
  75                     break;
  76                 }
  77                 bumpIndex();
  78             }
  79         }
  80 
  81         return indexInArray();
  82     }
  83 
  84     @Override
  85     public void remove() {
  86         array.delete(index, false);
  87     }
  88 }