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 ArrayIterator 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 ArrayIterator(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 }