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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript;

/** Object that can allows assignments to the result of function calls. */
public interface RefCallable extends Callable {
    /**
     * Perform function call in reference context. The args array reference should not be stored in
     * any object that is can be GC-reachable after this method returns. If this is necessary, for
     * example, to implement {@link Ref} methods, then store args.clone(), not args array itself.
     *
     * @param cx the current Context for this thread
     * @param thisObj the JavaScript this object
     * @param args the array of arguments
     */
    public Ref refCall(Context cx, Scriptable thisObj, Object[] args);
}