/*
 * Copyright (c) 2002, 2007, 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.
 *
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package sun.awt;

import java.awt.Component;
import java.awt.Container;
import java.awt.AWTEvent;
import java.awt.Font;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Point;

import java.awt.peer.ComponentPeer;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

import java.util.logging.Logger;
import java.util.logging.Level;

import java.security.AccessController;
import java.security.PrivilegedAction;

A collection of methods for modifying package private fields in AWT components.
This class is meant to be used by Peer code only. Previously peer code
got around this problem by modifying fields from native code. However
as we move away from native code to Pure-java peers we need this class.
Author:
Bino George/**
 * A collection of methods for modifying package private fields in AWT components.
 * This class is meant to be used by Peer code only. Previously peer code
 * got around this problem by modifying fields from native code. However
 * as we move away from native code to Pure-java peers we need this class.
 *
 * @author Bino George
 */


public class ComponentAccessor
{
    private static Class componentClass;
    private static Field fieldX;
    private static Field fieldY;
    private static Field fieldWidth;
    private static Field fieldHeight;
    private static Method methodGetParentNoClientCode;
    private static Method methodGetFontNoClientCode;
    private static Method methodProcessEvent;
    private static Method methodEnableEvents;
    private static Field fieldParent;
    private static Field fieldBackground;
    private static Field fieldForeground;
    private static Field fieldFont;
    private static Field fieldPacked;
    private static Field fieldIgnoreRepaint;
    private static Field fieldPeer;
    private static Method methodResetGC;
    private static Field fieldVisible;
    private static Method methodIsEnabledImpl;
    private static Method methodGetCursorNoClientCode;
    private static Method methodLocationNoClientCode;

    private static final Logger log = Logger.getLogger("sun.awt.ComponentAccessor");

    private ComponentAccessor() {
    }

    static {
        AccessController.doPrivileged( new PrivilegedAction() {
                public Object run() {
                    try {
                        componentClass = Class.forName("java.awt.Component");
                        fieldX  = componentClass.getDeclaredField("x");
                        fieldX.setAccessible(true);
                        fieldY  = componentClass.getDeclaredField("y");
                        fieldY.setAccessible(true);
                        fieldWidth  = componentClass.getDeclaredField("width");
                        fieldWidth.setAccessible(true);
                        fieldHeight  = componentClass.getDeclaredField("height");
                        fieldHeight.setAccessible(true);
                        fieldForeground  = componentClass.getDeclaredField("foreground");
                        fieldForeground.setAccessible(true);
                        fieldBackground  = componentClass.getDeclaredField("background");
                        fieldBackground.setAccessible(true);
                        fieldFont = componentClass.getDeclaredField("font");
                        fieldFont.setAccessible(true);
                        methodGetParentNoClientCode = componentClass.getDeclaredMethod("getParent_NoClientCode", (Class[]) null);
                        methodGetParentNoClientCode.setAccessible(true);
                        methodGetFontNoClientCode = componentClass.getDeclaredMethod("getFont_NoClientCode", (Class[]) null);
                        methodGetFontNoClientCode.setAccessible(true);
                        Class[] argTypes = { AWTEvent.class };
                        methodProcessEvent = componentClass.getDeclaredMethod("processEvent",argTypes);
                        methodProcessEvent.setAccessible(true);
                        Class[] argTypesForMethodEnableEvents = { Long.TYPE };
                        methodEnableEvents = componentClass.getDeclaredMethod("enableEvents",argTypesForMethodEnableEvents);
                        methodEnableEvents.setAccessible(true);

                        fieldParent  = componentClass.getDeclaredField("parent");
                        fieldParent.setAccessible(true);
                        fieldPacked = componentClass.getDeclaredField("isPacked");
                        fieldPacked.setAccessible(true);
                        fieldIgnoreRepaint = componentClass.getDeclaredField("ignoreRepaint");
                        fieldIgnoreRepaint.setAccessible(true);

                        fieldPeer = componentClass.getDeclaredField("peer");
                        fieldPeer.setAccessible(true);

                        methodResetGC = componentClass.getDeclaredMethod("resetGC", (Class[]) null);
                        methodResetGC.setAccessible(true);

                        fieldVisible = componentClass.getDeclaredField("visible");
                        fieldVisible.setAccessible(true);

                        methodIsEnabledImpl = componentClass.getDeclaredMethod("isEnabledImpl", (Class[]) null);
                        methodIsEnabledImpl.setAccessible(true);

                        methodGetCursorNoClientCode = componentClass.getDeclaredMethod("getCursor_NoClientCode", (Class[]) null);
                        methodGetCursorNoClientCode.setAccessible(true);

                        methodLocationNoClientCode = componentClass.getDeclaredMethod("location_NoClientCode", (Class[]) null);
                        methodLocationNoClientCode.setAccessible(true);
                    }
                    catch (NoSuchFieldException e) {
                        log.log(Level.FINE, "Unable to initialize ComponentAccessor", e);
                    }
                    catch (ClassNotFoundException e) {
                        log.log(Level.FINE, "Unable to initialize ComponentAccessor", e);
                    }
                    catch (NoSuchMethodException e) {
                        log.log(Level.FINE, "Unable to initialize ComponentAccessor", e);
                    }
                    // to please javac
                    return null;
                }
            });
    }

    public static void setX(Component c, int x)
    {
        try {
            fieldX.setInt(c,x);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static void setY(Component c, int y)
    {
        try {
            fieldY.setInt(c,y);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static void setWidth(Component c, int width)
    {
        try {
            fieldWidth.setInt(c,width);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static void setHeight(Component c, int height)
    {
        try {
            fieldHeight.setInt(c,height);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static void setBounds(Component c, int x, int y, int width, int height)
    {
        try {
            fieldX.setInt(c,x);
            fieldY.setInt(c,y);
            fieldWidth.setInt(c,width);
            fieldHeight.setInt(c,height);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static int getX(Component c) {
        try {
            return fieldX.getInt(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return 0;
    }

    public static int getY(Component c) {
        try {
            return fieldY.getInt(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return 0;
    }

    public static int getWidth(Component c) {
        try {
            return fieldWidth.getInt(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return 0;
    }

    public static int getHeight(Component c) {
        try {
            return fieldHeight.getInt(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return 0;
    }

    public static boolean getIsPacked(Component c) {
        try {
            return fieldPacked.getBoolean(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return false;
    }

    public static Container getParent_NoClientCode(Component c) {
        Container parent=null;

        try {
            parent = (Container) methodGetParentNoClientCode.invoke(c, (Object[]) null);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }

        return parent;
    }

    public static Font getFont_NoClientCode(Component c) {
        Font font=null;

        try {
            font = (Font) methodGetFontNoClientCode.invoke(c, (Object[]) null);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }

        return font;
    }

    public static void processEvent(Component c, AWTEvent event) {
        Font font=null;

        try {
            Object[] args = new Object[1];
            args[0] = event;
            methodProcessEvent.invoke(c,args);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }
    }

    public static void enableEvents(Component c, long event_mask) {
        try {
            Object[] args = new Object[1];
            args[0] = Long.valueOf(event_mask);
            methodEnableEvents.invoke(c,args);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }
    }

    public static void setParent(Component c, Container parent)
    {
        try {
            fieldParent.set(c,parent);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static Color getForeground(Component c)
    {
        Color color = null;
        try {
            color = (Color) fieldForeground.get(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return color;
    }

    public static Color getBackground(Component c)
    {
        Color color = null;
        try {
            color = (Color) fieldBackground.get(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return color;
    }

    public static void setBackground(Component c, Color color) {
        try {
            fieldBackground.set(c, color);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static Font getFont(Component c)
    {
        Font f = null;
        try {
            f = (Font) fieldFont.get(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return f;
    }

    public static ComponentPeer getPeer(Component c) {
        ComponentPeer peer = null;
        try {
            peer = (ComponentPeer)fieldPeer.get(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return peer;
    }

    public static void setPeer(Component c, ComponentPeer peer) {
        try {
            fieldPeer.set(c, peer);
        } catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
    }

    public static boolean getIgnoreRepaint(Component comp) {
        try {
            return fieldIgnoreRepaint.getBoolean(comp);
        }
        catch (IllegalAccessException e) {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }

        return false;
    }

    public static void resetGC(Component c) {
        try {
            methodResetGC.invoke(c, (Object[]) null);
        }
        catch (IllegalAccessException e) {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }
    }

    public static boolean getVisible(Component c) {
        try {
            return fieldVisible.getBoolean(c);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        return false;
    }

    public static boolean isEnabledImpl(Component c) {
        boolean enabled = true;
        try {
            enabled = (Boolean) methodIsEnabledImpl.invoke(c, (Object[]) null);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }
        return enabled;
    }

    public static Cursor getCursor_NoClientCode(Component c) {
        Cursor cursor = null;

        try {
            cursor = (Cursor) methodGetCursorNoClientCode.invoke(c, (Object[]) null);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }

        return cursor;
    }

    public static Point getLocation_NoClientCode(Component c) {
        Point loc = null;

        try {
            loc = (Point) methodLocationNoClientCode.invoke(c, (Object[]) null);
        }
        catch (IllegalAccessException e)
        {
            log.log(Level.FINE, "Unable to access the Component object", e);
        }
        catch (InvocationTargetException e) {
            log.log(Level.FINE, "Unable to invoke on the Component object", e);
        }

        return loc;
    }
}