/*
 * Copyright (c) 2011, 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.awt;

import java.awt.*;
import java.awt.event.InputEvent;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;

import sun.misc.Unsafe;
import java.awt.peer.ComponentPeer;

import java.security.AccessController;
import java.security.AccessControlContext;

/**
 * The AWTAccessor utility class.
 * The main purpose of this class is to enable accessing
 * private and package-private fields of classes from
 * different classes/packages. See sun.misc.SharedSecretes
 * for another example.
 */
public final class AWTAccessor {

    private static final Unsafe unsafe = Unsafe.getUnsafe();

    /*
     * We don't need any objects of this class.
     * It's rather a collection of static methods
     * and interfaces.
     */
    private AWTAccessor() {
    }

    /*
     * An interface of accessor for the java.awt.Component class.
     */
    public interface ComponentAccessor {
        /*
         * Returns the acc this component was constructed with.
         */
        AccessControlContext getAccessControlContext(Component comp);
    }

    /*
     * An accessor for the AWTEvent class.
     */
    public interface AWTEventAccessor {
        /**
         * Sets the flag on this AWTEvent indicating that it was
         * generated by the system.
         */
        void setSystemGenerated(AWTEvent ev);

        /**
         * Indicates whether this AWTEvent was generated by the system.
         */
        boolean isSystemGenerated(AWTEvent ev);


        /*
         * Returns the acc this event was constructed with.
         */
        AccessControlContext getAccessControlContext(AWTEvent ev);

    }

    /*
     * Accessor instances are initialized in the static initializers of
     * corresponding AWT classes by using setters defined below.
     */
    private static ComponentAccessor componentAccessor;
    private static AWTEventAccessor awtEventAccessor;

    /*
     * Set an accessor object for the java.awt.Component class.
     */
    public static void setComponentAccessor(ComponentAccessor ca) {
        componentAccessor = ca;
    }

    /*
     * Retrieve the accessor object for the java.awt.Component class.
     */
    public static ComponentAccessor getComponentAccessor() {
        if (componentAccessor == null) {
            unsafe.ensureClassInitialized(Component.class);
        }

        return componentAccessor;
    }

    /*
     * Set an accessor object for the java.awt.AWTEvent class.
     */
    public static void setAWTEventAccessor(AWTEventAccessor aea) {
        awtEventAccessor = aea;
    }

    /*
     * Retrieve the accessor object for the java.awt.AWTEvent class.
     */
    public static AWTEventAccessor getAWTEventAccessor() {
        if (awtEventAccessor == null) {
            unsafe.ensureClassInitialized(AWTEvent.class);
        }
        return awtEventAccessor;
    }
}