jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/runtime/arrays/ReverseJavaArrayIterator.java@ba507ac08719

8023026: Array.prototype iterator functions like forEach, reduce should work for Java arrays, lists
Reviewed-by: jlaskey, lagergren

     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  */

    26 package jdk.nashorn.internal.runtime.arrays;

    28 import java.lang.reflect.Array;

    30 /**

    31  * Reverse iterator over a array

    32  */

    33 final class ReverseJavaArrayIterator extends JavaArrayIterator {

    34     /**

    35      * Constructor

    36      * @param array array to iterate over

    37      * @param includeUndefined should undefined elements be included in iteration

    38      */

    39     public ReverseJavaArrayIterator(final Object array, final boolean includeUndefined) {

    40         super(array, includeUndefined);

    41         this.index = Array.getLength(array) - 1;

    42     }

    44     @Override

    45     public boolean isReverse() {

    46         return true;

    47     }

    49     @Override

    50     protected boolean indexInArray() {

    51         return index >= 0;

    52     }

    54     @Override

    55     protected long bumpIndex() {

    56         return index--;

    57     }

    58 }

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