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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;

/**
 * This interface may be combined with any object that implements Scriptable to add support for
 * properties keyed by Symbol objects (as opposed to String and number objects as in previous
 * versions of JavaScript. It's separated into its own interface so that the addition of Symbol
 * support does not break compatibility for existing code.
 *
 * @since 1.7.8
 */
public interface SymbolScriptable {
    /** Return the value of the property with the specified key, or NOT_FOUND. */
    Object get(Symbol key, Scriptable start);

    /** Return true if the specified property exists. */
    boolean has(Symbol key, Scriptable start);

    /** Add a new property to to the object. */
    void put(Symbol key, Scriptable start, Object value);

    /** Delete a property with the specified key. */
    void delete(Symbol key);
}