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Nashorn is an Open Source JavaScript (ECMAScript 5.1 and some 6 features) engine for the JVM.

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/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.openjdk.nashorn.api.tree;

/**
 * A tree node for an array access expression.
 *
 * For example:
 *  *   expression [ index ]
 * 
 *
 * @since 9
 */
public interface ArrayAccessTree extends ExpressionTree {
    /**
     * Returns the array that is accessed.
     *
     * @return the array that is accessed
     */
    ExpressionTree getExpression();

    /**
     * Returns the index of the array element accessed.
     *
     * @return the index expression
     */
    ExpressionTree getIndex();
}