nashorn/src/jdk/nashorn/internal/runtime/arrays/ReverseMapIterator.java
author hannesw
Wed, 05 Jun 2013 12:44:24 +0200
changeset 17983 4b1e3d565f9b
parent 16151 97c1e756ae1e
permissions -rw-r--r--
8015350: Array.prototype.reduceRight issue with large length and index Reviewed-by: attila, sundar, lagergren
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/*
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 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package jdk.nashorn.internal.runtime.arrays;
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import jdk.nashorn.internal.runtime.JSType;
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import jdk.nashorn.internal.runtime.ScriptObject;
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/**
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 * Reverse iterator over a map
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 */
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final class ReverseMapIterator extends MapIterator {
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    ReverseMapIterator(final ScriptObject obj, final boolean includeUndefined) {
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        super(obj, includeUndefined);
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        this.index = JSType.toUint32(obj.getLength()) - 1;
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    }
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    @Override
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    public boolean isReverse() {
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        return true;
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    }
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    @Override
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    protected boolean indexInArray() {
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        return index >= 0;
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    }
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    @Override
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    protected long bumpIndex() {
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        return index--;
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    }
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}