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• Function.java

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org.mozilla.javascript.Function Maven / Gradle / Ivy

/* -*- 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
{
    /**
     * 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
     */
    public 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
     */
    public Scriptable construct(Context cx, Scriptable scope, Object[] args);
}