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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/. */

// API class

package org.mozilla.javascript;

/**
 * This is interface that all functions in JavaScript must implement. The interface provides for
 * calling functions and constructors.
 *
 * @see org.mozilla.javascript.Scriptable
 * @author Norris Boyd
 */
public interface Function extends Scriptable, Callable, Constructable {
    /**
     * Call the function.
     *
     * Note that the array of arguments is not guaranteed to have length greater than 0.
     *
     * @param cx the current Context for this thread
     * @param scope the scope to execute the function relative to. This is set to the value returned
     *     by getParentScope() except when the function is called from a closure.
     * @param thisObj the JavaScript this object
     * @param args the array of arguments
     * @return the result of the call
     */
    @Override
    Object call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args);

    /**
     * Call the function as a constructor.
     *
     * This method is invoked by the runtime in order to satisfy a use of the JavaScript 
     * new operator. This method is expected to create a new object and return it.
     *
     * @param cx the current Context for this thread
     * @param scope an enclosing scope of the caller except when the function is called from a
     *     closure.
     * @param args the array of arguments
     * @return the allocated object
     */
    @Override
    Scriptable construct(Context cx, Scriptable scope, Object[] args);
}