/*
 * Copyright (c) 1999, 2014, 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 java.awt;

import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.awt.peer.RobotPeer;
import java.lang.reflect.InvocationTargetException;
import sun.awt.ComponentFactory;
import sun.awt.SunToolkit;
import sun.awt.image.SunWritableRaster;
import sun.security.util.SecurityConstants;

This class is used to generate native system input events
for the purposes of test automation, self-running demos, and
other applications where control of the mouse and keyboard
is needed. The primary purpose of Robot is to facilitate
automated testing of Java platform implementations.

Using the class to generate input events differs from posting
events to the AWT event queue or AWT components in that the
events are generated in the platform's native input
queue. For example, Robot.mouseMove will actually move
the mouse cursor instead of just generating mouse move events.

Note that some platforms require special privileges or extensions
to access low-level input control. If the current platform configuration
does not allow input control, an AWTException will be thrown
when trying to construct Robot objects. For example, X-Window systems
will throw the exception if the XTEST 2.2 standard extension is not supported
(or not enabled) by the X server.

Applications that use Robot for purposes other than self-testing should
handle these error conditions gracefully.
Author:
     Robi Khan
Since:
      1.3/**
 * This class is used to generate native system input events
 * for the purposes of test automation, self-running demos, and
 * other applications where control of the mouse and keyboard
 * is needed. The primary purpose of Robot is to facilitate
 * automated testing of Java platform implementations.
 * <p>
 * Using the class to generate input events differs from posting
 * events to the AWT event queue or AWT components in that the
 * events are generated in the platform's native input
 * queue. For example, <code>Robot.mouseMove</code> will actually move
 * the mouse cursor instead of just generating mouse move events.
 * <p>
 * Note that some platforms require special privileges or extensions
 * to access low-level input control. If the current platform configuration
 * does not allow input control, an <code>AWTException</code> will be thrown
 * when trying to construct Robot objects. For example, X-Window systems
 * will throw the exception if the XTEST 2.2 standard extension is not supported
 * (or not enabled) by the X server.
 * <p>
 * Applications that use Robot for purposes other than self-testing should
 * handle these error conditions gracefully.
 *
 * @author      Robi Khan
 * @since       1.3
 */
public class Robot {
    private static final int MAX_DELAY = 60000;
    private RobotPeer peer;
    private boolean isAutoWaitForIdle = false;
    private int autoDelay = 0;
    private static int LEGAL_BUTTON_MASK = 0;

    private DirectColorModel screenCapCM = null;

    
Constructs a Robot object in the coordinate system of the primary screen.

Throws:
AWTException – if the platform configuration does not allow
low-level input control.  This exception is always thrown when
GraphicsEnvironment.isHeadless() returns true
SecurityException – if createRobot permission is not granted
See Also:
GraphicsEnvironment.isHeadless
SecurityManager.checkPermission
AWTPermission/**
     * Constructs a Robot object in the coordinate system of the primary screen.
     * <p>
     *
     * @throws  AWTException if the platform configuration does not allow
     * low-level input control.  This exception is always thrown when
     * GraphicsEnvironment.isHeadless() returns true
     * @throws  SecurityException if <code>createRobot</code> permission is not granted
     * @see     java.awt.GraphicsEnvironment#isHeadless
     * @see     SecurityManager#checkPermission
     * @see     AWTPermission
     */
    public Robot() throws AWTException {
        if (GraphicsEnvironment.isHeadless()) {
            throw new AWTException("headless environment");
        }
        init(GraphicsEnvironment.getLocalGraphicsEnvironment()
            .getDefaultScreenDevice());
    }

    
Creates a Robot for the given screen device. Coordinates passed
to Robot method calls like mouseMove and createScreenCapture will
be interpreted as being in the same coordinate system as the
specified screen. Note that depending on the platform configuration,
multiple screens may either:

share the same coordinate system to form a combined virtual screen
use different coordinate systems to act as independent screens

This constructor is meant for the latter case.

If screen devices are reconfigured such that the coordinate system is
affected, the behavior of existing Robot objects is undefined.
Params:
screen –    A screen GraphicsDevice indicating the coordinate
                 system the Robot will operate in.
Throws:
AWTException – if the platform configuration does not allow
low-level input control.  This exception is always thrown when
GraphicsEnvironment.isHeadless() returns true.
IllegalArgumentException – if screen is not a screen
         GraphicsDevice.
SecurityException – if createRobot permission is not granted
See Also:
GraphicsEnvironment.isHeadless
GraphicsDevice
SecurityManager.checkPermission
AWTPermission/**
     * Creates a Robot for the given screen device. Coordinates passed
     * to Robot method calls like mouseMove and createScreenCapture will
     * be interpreted as being in the same coordinate system as the
     * specified screen. Note that depending on the platform configuration,
     * multiple screens may either:
     * <ul>
     * <li>share the same coordinate system to form a combined virtual screen</li>
     * <li>use different coordinate systems to act as independent screens</li>
     * </ul>
     * This constructor is meant for the latter case.
     * <p>
     * If screen devices are reconfigured such that the coordinate system is
     * affected, the behavior of existing Robot objects is undefined.
     *
     * @param screen    A screen GraphicsDevice indicating the coordinate
     *                  system the Robot will operate in.
     * @throws  AWTException if the platform configuration does not allow
     * low-level input control.  This exception is always thrown when
     * GraphicsEnvironment.isHeadless() returns true.
     * @throws  IllegalArgumentException if <code>screen</code> is not a screen
     *          GraphicsDevice.
     * @throws  SecurityException if <code>createRobot</code> permission is not granted
     * @see     java.awt.GraphicsEnvironment#isHeadless
     * @see     GraphicsDevice
     * @see     SecurityManager#checkPermission
     * @see     AWTPermission
     */
    public Robot(GraphicsDevice screen) throws AWTException {
        checkIsScreenDevice(screen);
        init(screen);
    }

    private void init(GraphicsDevice screen) throws AWTException {
        checkRobotAllowed();
        Toolkit toolkit = Toolkit.getDefaultToolkit();
        if (toolkit instanceof ComponentFactory) {
            peer = ((ComponentFactory)toolkit).createRobot(this, screen);
            disposer = new RobotDisposer(peer);
            sun.java2d.Disposer.addRecord(anchor, disposer);
        }
        initLegalButtonMask();
    }

    private static synchronized void initLegalButtonMask() {
        if (LEGAL_BUTTON_MASK != 0) return;

        int tmpMask = 0;
        if (Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled()){
            if (Toolkit.getDefaultToolkit() instanceof SunToolkit) {
                final int buttonsNumber = ((SunToolkit)(Toolkit.getDefaultToolkit())).getNumberOfButtons();
                for (int i = 0; i < buttonsNumber; i++){
                    tmpMask |= InputEvent.getMaskForButton(i+1);
                }
            }
        }
        tmpMask |= InputEvent.BUTTON1_MASK|
            InputEvent.BUTTON2_MASK|
            InputEvent.BUTTON3_MASK|
            InputEvent.BUTTON1_DOWN_MASK|
            InputEvent.BUTTON2_DOWN_MASK|
            InputEvent.BUTTON3_DOWN_MASK;
        LEGAL_BUTTON_MASK = tmpMask;
    }

    /* determine if the security policy allows Robot's to be created */
    private void checkRobotAllowed() {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkPermission(SecurityConstants.AWT.CREATE_ROBOT_PERMISSION);
        }
    }

    /* check if the given device is a screen device */
    private void checkIsScreenDevice(GraphicsDevice device) {
        if (device == null || device.getType() != GraphicsDevice.TYPE_RASTER_SCREEN) {
            throw new IllegalArgumentException("not a valid screen device");
        }
    }

    private transient Object anchor = new Object();

    static class RobotDisposer implements sun.java2d.DisposerRecord {
        private final RobotPeer peer;
        public RobotDisposer(RobotPeer peer) {
            this.peer = peer;
        }
        public void dispose() {
            if (peer != null) {
                peer.dispose();
            }
        }
    }

    private transient RobotDisposer disposer;

    
Moves mouse pointer to given screen coordinates.
Params:
x –         X position
y –         Y position/**
     * Moves mouse pointer to given screen coordinates.
     * @param x         X position
     * @param y         Y position
     */
    public synchronized void mouseMove(int x, int y) {
        peer.mouseMove(x, y);
        afterEvent();
    }

    
Presses one or more mouse buttons. The mouse buttons should be released using the mouseRelease(int) method. 
Params:
buttons – the Button mask; a combination of one or more
mouse button masks.
 It is allowed to use only a combination of valid values as a buttons parameter. A valid combination consists of InputEvent.BUTTON1_DOWN_MASK, InputEvent.BUTTON2_DOWN_MASK, InputEvent.BUTTON3_DOWN_MASK and values returned by the InputEvent.getMaskForButton(button) method. The valid combination also depends on a Toolkit.areExtraMouseButtonsEnabled() value as follows: 

 If support for extended mouse buttons is disabled by Java then it is allowed to use only the following standard button masks: InputEvent.BUTTON1_DOWN_MASK, InputEvent.BUTTON2_DOWN_MASK, InputEvent.BUTTON3_DOWN_MASK. 
 If support for extended mouse buttons is enabled by Java then it is allowed to use the standard button masks and masks for existing extended mouse buttons, if the mouse has more then three buttons. In that way, it is allowed to use the button masks corresponding to the buttons in the range from 1 to MouseInfo.getNumberOfButtons(). 
 It is recommended to use the InputEvent.getMaskForButton(button) method to obtain the mask for any mouse button by its number. 

The following standard button masks are also accepted:

InputEvent.BUTTON1_MASK 
InputEvent.BUTTON2_MASK 
InputEvent.BUTTON3_MASK 
 However, it is recommended to use InputEvent.BUTTON1_DOWN_MASK, InputEvent.BUTTON2_DOWN_MASK, InputEvent.BUTTON3_DOWN_MASK instead. Either extended _DOWN_MASK or old _MASK values should be used, but both those models should not be mixed.
Throws:
IllegalArgumentException – if the buttons mask contains the mask for extra mouse button and support for extended mouse buttons is disabled by Java
IllegalArgumentException – if the buttons mask contains the mask for extra mouse button that does not exist on the mouse and support for extended mouse buttons is enabled by Java
See Also:
mouseRelease(int)
InputEvent.getMaskForButton(int)
Toolkit.areExtraMouseButtonsEnabled()
MouseInfo.getNumberOfButtons()
MouseEvent/**
     * Presses one or more mouse buttons.  The mouse buttons should
     * be released using the {@link #mouseRelease(int)} method.
     *
     * @param buttons the Button mask; a combination of one or more
     * mouse button masks.
     * <p>
     * It is allowed to use only a combination of valid values as a {@code buttons} parameter.
     * A valid combination consists of {@code InputEvent.BUTTON1_DOWN_MASK},
     * {@code InputEvent.BUTTON2_DOWN_MASK}, {@code InputEvent.BUTTON3_DOWN_MASK}
     * and values returned by the
     * {@link InputEvent#getMaskForButton(int) InputEvent.getMaskForButton(button)} method.
     *
     * The valid combination also depends on a
     * {@link Toolkit#areExtraMouseButtonsEnabled() Toolkit.areExtraMouseButtonsEnabled()} value as follows:
     * <ul>
     * <li> If support for extended mouse buttons is
     * {@link Toolkit#areExtraMouseButtonsEnabled() disabled} by Java
     * then it is allowed to use only the following standard button masks:
     * {@code InputEvent.BUTTON1_DOWN_MASK}, {@code InputEvent.BUTTON2_DOWN_MASK},
     * {@code InputEvent.BUTTON3_DOWN_MASK}.
     * <li> If support for extended mouse buttons is
     * {@link Toolkit#areExtraMouseButtonsEnabled() enabled} by Java
     * then it is allowed to use the standard button masks
     * and masks for existing extended mouse buttons, if the mouse has more then three buttons.
     * In that way, it is allowed to use the button masks corresponding to the buttons
     * in the range from 1 to {@link java.awt.MouseInfo#getNumberOfButtons() MouseInfo.getNumberOfButtons()}.
     * <br>
     * It is recommended to use the {@link InputEvent#getMaskForButton(int) InputEvent.getMaskForButton(button)}
     * method to obtain the mask for any mouse button by its number.
     * </ul>
     * <p>
     * The following standard button masks are also accepted:
     * <ul>
     * <li>{@code InputEvent.BUTTON1_MASK}
     * <li>{@code InputEvent.BUTTON2_MASK}
     * <li>{@code InputEvent.BUTTON3_MASK}
     * </ul>
     * However, it is recommended to use {@code InputEvent.BUTTON1_DOWN_MASK},
     * {@code InputEvent.BUTTON2_DOWN_MASK},  {@code InputEvent.BUTTON3_DOWN_MASK} instead.
     * Either extended {@code _DOWN_MASK} or old {@code _MASK} values
     * should be used, but both those models should not be mixed.
     * @throws IllegalArgumentException if the {@code buttons} mask contains the mask for extra mouse button
     *         and support for extended mouse buttons is {@link Toolkit#areExtraMouseButtonsEnabled() disabled} by Java
     * @throws IllegalArgumentException if the {@code buttons} mask contains the mask for extra mouse button
     *         that does not exist on the mouse and support for extended mouse buttons is {@link Toolkit#areExtraMouseButtonsEnabled() enabled} by Java
     * @see #mouseRelease(int)
     * @see InputEvent#getMaskForButton(int)
     * @see Toolkit#areExtraMouseButtonsEnabled()
     * @see java.awt.MouseInfo#getNumberOfButtons()
     * @see java.awt.event.MouseEvent
     */
    public synchronized void mousePress(int buttons) {
        checkButtonsArgument(buttons);
        peer.mousePress(buttons);
        afterEvent();
    }

    
Releases one or more mouse buttons.
Params:
buttons – the Button mask; a combination of one or more
mouse button masks.
 It is allowed to use only a combination of valid values as a buttons parameter. A valid combination consists of InputEvent.BUTTON1_DOWN_MASK, InputEvent.BUTTON2_DOWN_MASK, InputEvent.BUTTON3_DOWN_MASK and values returned by the InputEvent.getMaskForButton(button) method. The valid combination also depends on a Toolkit.areExtraMouseButtonsEnabled() value as follows: 

 If the support for extended mouse buttons is disabled by Java then it is allowed to use only the following standard button masks: InputEvent.BUTTON1_DOWN_MASK, InputEvent.BUTTON2_DOWN_MASK, InputEvent.BUTTON3_DOWN_MASK. 
 If the support for extended mouse buttons is enabled by Java then it is allowed to use the standard button masks and masks for existing extended mouse buttons, if the mouse has more then three buttons. In that way, it is allowed to use the button masks corresponding to the buttons in the range from 1 to MouseInfo.getNumberOfButtons(). 
 It is recommended to use the InputEvent.getMaskForButton(button) method to obtain the mask for any mouse button by its number. 

The following standard button masks are also accepted:

InputEvent.BUTTON1_MASK 
InputEvent.BUTTON2_MASK 
InputEvent.BUTTON3_MASK 
 However, it is recommended to use InputEvent.BUTTON1_DOWN_MASK, InputEvent.BUTTON2_DOWN_MASK, InputEvent.BUTTON3_DOWN_MASK instead. Either extended _DOWN_MASK or old _MASK values should be used, but both those models should not be mixed.
Throws:
IllegalArgumentException – if the buttons mask contains the mask for extra mouse button and support for extended mouse buttons is disabled by Java
IllegalArgumentException – if the buttons mask contains the mask for extra mouse button that does not exist on the mouse and support for extended mouse buttons is enabled by Java
See Also:
mousePress(int)
InputEvent.getMaskForButton(int)
Toolkit.areExtraMouseButtonsEnabled()
MouseInfo.getNumberOfButtons()
MouseEvent/**
     * Releases one or more mouse buttons.
     *
     * @param buttons the Button mask; a combination of one or more
     * mouse button masks.
     * <p>
     * It is allowed to use only a combination of valid values as a {@code buttons} parameter.
     * A valid combination consists of {@code InputEvent.BUTTON1_DOWN_MASK},
     * {@code InputEvent.BUTTON2_DOWN_MASK}, {@code InputEvent.BUTTON3_DOWN_MASK}
     * and values returned by the
     * {@link InputEvent#getMaskForButton(int) InputEvent.getMaskForButton(button)} method.
     *
     * The valid combination also depends on a
     * {@link Toolkit#areExtraMouseButtonsEnabled() Toolkit.areExtraMouseButtonsEnabled()} value as follows:
     * <ul>
     * <li> If the support for extended mouse buttons is
     * {@link Toolkit#areExtraMouseButtonsEnabled() disabled} by Java
     * then it is allowed to use only the following standard button masks:
     * {@code InputEvent.BUTTON1_DOWN_MASK}, {@code InputEvent.BUTTON2_DOWN_MASK},
     * {@code InputEvent.BUTTON3_DOWN_MASK}.
     * <li> If the support for extended mouse buttons is
     * {@link Toolkit#areExtraMouseButtonsEnabled() enabled} by Java
     * then it is allowed to use the standard button masks
     * and masks for existing extended mouse buttons, if the mouse has more then three buttons.
     * In that way, it is allowed to use the button masks corresponding to the buttons
     * in the range from 1 to {@link java.awt.MouseInfo#getNumberOfButtons() MouseInfo.getNumberOfButtons()}.
     * <br>
     * It is recommended to use the {@link InputEvent#getMaskForButton(int) InputEvent.getMaskForButton(button)}
     * method to obtain the mask for any mouse button by its number.
     * </ul>
     * <p>
     * The following standard button masks are also accepted:
     * <ul>
     * <li>{@code InputEvent.BUTTON1_MASK}
     * <li>{@code InputEvent.BUTTON2_MASK}
     * <li>{@code InputEvent.BUTTON3_MASK}
     * </ul>
     * However, it is recommended to use {@code InputEvent.BUTTON1_DOWN_MASK},
     * {@code InputEvent.BUTTON2_DOWN_MASK},  {@code InputEvent.BUTTON3_DOWN_MASK} instead.
     * Either extended {@code _DOWN_MASK} or old {@code _MASK} values
     * should be used, but both those models should not be mixed.
     * @throws IllegalArgumentException if the {@code buttons} mask contains the mask for extra mouse button
     *         and support for extended mouse buttons is {@link Toolkit#areExtraMouseButtonsEnabled() disabled} by Java
     * @throws IllegalArgumentException if the {@code buttons} mask contains the mask for extra mouse button
     *         that does not exist on the mouse and support for extended mouse buttons is {@link Toolkit#areExtraMouseButtonsEnabled() enabled} by Java
     * @see #mousePress(int)
     * @see InputEvent#getMaskForButton(int)
     * @see Toolkit#areExtraMouseButtonsEnabled()
     * @see java.awt.MouseInfo#getNumberOfButtons()
     * @see java.awt.event.MouseEvent
     */
    public synchronized void mouseRelease(int buttons) {
        checkButtonsArgument(buttons);
        peer.mouseRelease(buttons);
        afterEvent();
    }

    private void checkButtonsArgument(int buttons) {
        if ( (buttons|LEGAL_BUTTON_MASK) != LEGAL_BUTTON_MASK ) {
            throw new IllegalArgumentException("Invalid combination of button flags");
        }
    }

    
Rotates the scroll wheel on wheel-equipped mice.
Params:
wheelAmt –  number of "notches" to move the mouse wheel
                 Negative values indicate movement up/away from the user,
                 positive values indicate movement down/towards the user.
Since:
1.4/**
     * Rotates the scroll wheel on wheel-equipped mice.
     *
     * @param wheelAmt  number of "notches" to move the mouse wheel
     *                  Negative values indicate movement up/away from the user,
     *                  positive values indicate movement down/towards the user.
     *
     * @since 1.4
     */
    public synchronized void mouseWheel(int wheelAmt) {
        peer.mouseWheel(wheelAmt);
        afterEvent();
    }

    
Presses a given key.  The key should be released using the
keyRelease method.

Key codes that have more than one physical key associated with them
(e.g. KeyEvent.VK_SHIFT could mean either the
left or right shift key) will map to the left key.
Params:
keycode – Key to press (e.g. KeyEvent.VK_A)
Throws:
IllegalArgumentException – if keycode is not
         a valid key
See Also:
keyRelease(int)
KeyEvent/**
     * Presses a given key.  The key should be released using the
     * <code>keyRelease</code> method.
     * <p>
     * Key codes that have more than one physical key associated with them
     * (e.g. <code>KeyEvent.VK_SHIFT</code> could mean either the
     * left or right shift key) will map to the left key.
     *
     * @param   keycode Key to press (e.g. <code>KeyEvent.VK_A</code>)
     * @throws  IllegalArgumentException if <code>keycode</code> is not
     *          a valid key
     * @see     #keyRelease(int)
     * @see     java.awt.event.KeyEvent
     */
    public synchronized void keyPress(int keycode) {
        checkKeycodeArgument(keycode);
        peer.keyPress(keycode);
        afterEvent();
    }

    
Releases a given key.

Key codes that have more than one physical key associated with them
(e.g. KeyEvent.VK_SHIFT could mean either the
left or right shift key) will map to the left key.
Params:
keycode – Key to release (e.g. KeyEvent.VK_A)
Throws:
IllegalArgumentException – if keycode is not a
         valid key
See Also:
keyPress(int)
KeyEvent/**
     * Releases a given key.
     * <p>
     * Key codes that have more than one physical key associated with them
     * (e.g. <code>KeyEvent.VK_SHIFT</code> could mean either the
     * left or right shift key) will map to the left key.
     *
     * @param   keycode Key to release (e.g. <code>KeyEvent.VK_A</code>)
     * @throws  IllegalArgumentException if <code>keycode</code> is not a
     *          valid key
     * @see  #keyPress(int)
     * @see     java.awt.event.KeyEvent
     */
    public synchronized void keyRelease(int keycode) {
        checkKeycodeArgument(keycode);
        peer.keyRelease(keycode);
        afterEvent();
    }

    private void checkKeycodeArgument(int keycode) {
        // rather than build a big table or switch statement here, we'll
        // just check that the key isn't VK_UNDEFINED and assume that the
        // peer implementations will throw an exception for other bogus
        // values e.g. -1, 999999
        if (keycode == KeyEvent.VK_UNDEFINED) {
            throw new IllegalArgumentException("Invalid key code");
        }
    }

    
Returns the color of a pixel at the given screen coordinates.
Params:
x –       X position of pixel
y –       Y position of pixel
Returns:
 Color of the pixel/**
     * Returns the color of a pixel at the given screen coordinates.
     * @param   x       X position of pixel
     * @param   y       Y position of pixel
     * @return  Color of the pixel
     */
    public synchronized Color getPixelColor(int x, int y) {
        checkScreenCaptureAllowed();
        Color color = new Color(peer.getRGBPixel(x, y));
        return color;
    }

    
Creates an image containing pixels read from the screen.  This image does
not include the mouse cursor.
Params:
screenRect –      Rect to capture in screen coordinates
Throws:
IllegalArgumentException – if screenRect width and height are not greater than zero
SecurityException – if readDisplayPixels permission is not granted
See Also:
SecurityManager.checkPermission
AWTPermission
Returns:
 The captured image/**
     * Creates an image containing pixels read from the screen.  This image does
     * not include the mouse cursor.
     * @param   screenRect      Rect to capture in screen coordinates
     * @return  The captured image
     * @throws  IllegalArgumentException if <code>screenRect</code> width and height are not greater than zero
     * @throws  SecurityException if <code>readDisplayPixels</code> permission is not granted
     * @see     SecurityManager#checkPermission
     * @see     AWTPermission
     */
    public synchronized BufferedImage createScreenCapture(Rectangle screenRect) {
        checkScreenCaptureAllowed();

        checkValidRect(screenRect);

        BufferedImage image;
        DataBufferInt buffer;
        WritableRaster raster;

        if (screenCapCM == null) {
            /*
             * Fix for 4285201
             * Create a DirectColorModel equivalent to the default RGB ColorModel,
             * except with no Alpha component.
             */

            screenCapCM = new DirectColorModel(24,
                                               /* red mask */    0x00FF0000,
                                               /* green mask */  0x0000FF00,
                                               /* blue mask */   0x000000FF);
        }

        // need to sync the toolkit prior to grabbing the pixels since in some
        // cases rendering to the screen may be delayed
        Toolkit.getDefaultToolkit().sync();

        int pixels[];
        int[] bandmasks = new int[3];

        pixels = peer.getRGBPixels(screenRect);
        buffer = new DataBufferInt(pixels, pixels.length);

        bandmasks[0] = screenCapCM.getRedMask();
        bandmasks[1] = screenCapCM.getGreenMask();
        bandmasks[2] = screenCapCM.getBlueMask();

        raster = Raster.createPackedRaster(buffer, screenRect.width, screenRect.height, screenRect.width, bandmasks, null);
        SunWritableRaster.makeTrackable(buffer);

        image = new BufferedImage(screenCapCM, raster, false, null);

        return image;
    }

    private static void checkValidRect(Rectangle rect) {
        if (rect.width <= 0 || rect.height <= 0) {
            throw new IllegalArgumentException("Rectangle width and height must be > 0");
        }
    }

    private static void checkScreenCaptureAllowed() {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkPermission(
                SecurityConstants.AWT.READ_DISPLAY_PIXELS_PERMISSION);
        }
    }

    /*
     * Called after an event is generated
     */
    private void afterEvent() {
        autoWaitForIdle();
        autoDelay();
    }

    
Returns whether this Robot automatically invokes waitForIdle
after generating an event.
Returns:
Whether waitForIdle is automatically called/**
     * Returns whether this Robot automatically invokes <code>waitForIdle</code>
     * after generating an event.
     * @return Whether <code>waitForIdle</code> is automatically called
     */
    public synchronized boolean isAutoWaitForIdle() {
        return isAutoWaitForIdle;
    }

    
Sets whether this Robot automatically invokes waitForIdle
after generating an event.
Params:
isOn –    Whether waitForIdle is automatically invoked/**
     * Sets whether this Robot automatically invokes <code>waitForIdle</code>
     * after generating an event.
     * @param   isOn    Whether <code>waitForIdle</code> is automatically invoked
     */
    public synchronized void setAutoWaitForIdle(boolean isOn) {
        isAutoWaitForIdle = isOn;
    }

    /*
     * Calls waitForIdle after every event if so desired.
     */
    private void autoWaitForIdle() {
        if (isAutoWaitForIdle) {
            waitForIdle();
        }
    }

    
Returns the number of milliseconds this Robot sleeps after generating an event.
/**
     * Returns the number of milliseconds this Robot sleeps after generating an event.
     */
    public synchronized int getAutoDelay() {
        return autoDelay;
    }

    
Sets the number of milliseconds this Robot sleeps after generating an event.
Throws:
IllegalArgumentException – If ms is not between 0 and 60,000 milliseconds inclusive/**
     * Sets the number of milliseconds this Robot sleeps after generating an event.
     * @throws  IllegalArgumentException If <code>ms</code> is not between 0 and 60,000 milliseconds inclusive
     */
    public synchronized void setAutoDelay(int ms) {
        checkDelayArgument(ms);
        autoDelay = ms;
    }

    /*
     * Automatically sleeps for the specified interval after event generated.
     */
    private void autoDelay() {
        delay(autoDelay);
    }

    
Sleeps for the specified time.
To catch any InterruptedExceptions that occur,
Thread.sleep() may be used instead.
Params:
ms –      time to sleep in milliseconds
Throws:
IllegalArgumentException – if ms is not between 0 and 60,000 milliseconds inclusive
See Also:
Thread.sleep/**
     * Sleeps for the specified time.
     * To catch any <code>InterruptedException</code>s that occur,
     * <code>Thread.sleep()</code> may be used instead.
     * @param   ms      time to sleep in milliseconds
     * @throws  IllegalArgumentException if <code>ms</code> is not between 0 and 60,000 milliseconds inclusive
     * @see     java.lang.Thread#sleep
     */
    public synchronized void delay(int ms) {
        checkDelayArgument(ms);
        try {
            Thread.sleep(ms);
        } catch(InterruptedException ite) {
            ite.printStackTrace();
        }
    }

    private void checkDelayArgument(int ms) {
        if (ms < 0 || ms > MAX_DELAY) {
            throw new IllegalArgumentException("Delay must be to 0 to 60,000ms");
        }
    }

    
Waits until all events currently on the event queue have been processed.
Throws:
IllegalThreadStateException – if called on the AWT event dispatching thread/**
     * Waits until all events currently on the event queue have been processed.
     * @throws  IllegalThreadStateException if called on the AWT event dispatching thread
     */
    public synchronized void waitForIdle() {
        checkNotDispatchThread();
        // post a dummy event to the queue so we know when
        // all the events before it have been processed
        try {
            SunToolkit.flushPendingEvents();
            EventQueue.invokeAndWait( new Runnable() {
                                            public void run() {
                                                // dummy implementation
                                            }
                                        } );
        } catch(InterruptedException ite) {
            System.err.println("Robot.waitForIdle, non-fatal exception caught:");
            ite.printStackTrace();
        } catch(InvocationTargetException ine) {
            System.err.println("Robot.waitForIdle, non-fatal exception caught:");
            ine.printStackTrace();
        }
    }

    private void checkNotDispatchThread() {
        if (EventQueue.isDispatchThread()) {
            throw new IllegalThreadStateException("Cannot call method from the event dispatcher thread");
        }
    }

    
Returns a string representation of this Robot.
Returns:
 the string representation./**
     * Returns a string representation of this Robot.
     *
     * @return  the string representation.
     */
    public synchronized String toString() {
        String params = "autoDelay = "+getAutoDelay()+", "+"autoWaitForIdle = "+isAutoWaitForIdle();
        return getClass().getName() + "[ " + params + " ]";
    }
}