Cross-Platform Utilities

/**
 * Abstract base class providing cross-platform file operations
 */
public abstract class FileUtils {
    /**
     * Get platform-specific implementation of FileUtils
     * @return FileUtils instance appropriate for current platform
     */
    public static FileUtils getInstance();
    
    /**
     * Move files to the system trash/recycle bin
     * @param files Files to move to trash
     * @throws IOException if trash operation fails
     */
    public abstract void moveToTrash(File... files) throws IOException;
    
    /**
     * Check if the current platform supports trash functionality
     * @return true if trash is available
     */
    public abstract boolean hasTrash();
}

import com.sun.jna.platform.FileUtils;
import java.io.File;
import java.io.IOException;

// Get platform-specific file utilities
FileUtils fileUtils = FileUtils.getInstance();

// Check if trash is supported
if (fileUtils.hasTrash()) {
    try {
        // Move files to trash
        fileUtils.moveToTrash(
            new File("temp.txt"),
            new File("old_data.csv")
        );
        System.out.println("Files moved to trash successfully");
    } catch (IOException e) {
        System.err.println("Failed to move files to trash: " + e.getMessage());
    }
} else {
    System.out.println("Trash functionality not available on this platform");
}

/**
 * Cross-platform window manipulation utilities
 * Provides shape masking, transparency effects, and window information
 */
public class WindowUtils {
    /** Use this to clear a window mask */
    public static final Shape MASK_NONE = null;
    
    // Window Masking Methods
    /**
     * Apply a shape mask to a window, making parts transparent
     * @param w Window to apply mask to
     * @param mask Shape defining visible area (bitmap treated, ignores transparency)
     */
    public static void setWindowMask(Window w, Shape mask);
    
    /**
     * Apply a shape mask to a heavyweight component
     * @param c Component to apply mask to
     * @param mask Shape defining visible area
     */
    public static void setComponentMask(Component c, Shape mask);
    
    /**
     * Apply an icon-based mask to a window
     * @param w Window to apply mask to
     * @param mask Icon to use as mask (non-transparent pixels included)
     */
    public static void setWindowMask(Window w, Icon mask);
    
    // Alpha/Transparency Methods
    /**
     * Check if window alpha transparency is supported
     * @return true if global alpha setting is supported
     */
    public static boolean isWindowAlphaSupported();
    
    /**
     * Get graphics configuration compatible with alpha compositing
     * @return GraphicsConfiguration suitable for alpha operations
     */
    public static GraphicsConfiguration getAlphaCompatibleGraphicsConfiguration();
    
    /**
     * Set window transparency level (Windows requires sun.java2d.noddraw=true)
     * @param w Window to make transparent
     * @param alpha Transparency level (1.0f = opaque, 0.0f = transparent)
     */
    public static void setWindowAlpha(Window w, float alpha);
    
    /**
     * Make window transparent with per-pixel alpha (macOS requires apple.awt.draggableWindowBackground)
     * @param w Window to make transparent
     * @param transparent true for per-pixel transparency, false for opaque
     */
    public static void setWindowTransparent(Window w, boolean transparent);
    
    // Window Information Methods (Windows-only)
    /**
     * Get icon from window handle (Windows only)
     * @param hwnd Window handle (HWND)
     * @return BufferedImage of window icon, or null if error
     */
    public static BufferedImage getWindowIcon(HWND hwnd);
    
    /**
     * Get size of an icon (Windows only)
     * @param hIcon Icon handle (HICON)
     * @return Dimension of icon, or (0,0) if error
     */
    public static Dimension getIconSize(HICON hIcon);
    
    /**
     * Get all desktop windows with detailed information (Windows only)
     * @param onlyVisibleWindows true to return only visible/non-minimized windows
     * @return List of DesktopWindow objects with window information
     */
    public static List<DesktopWindow> getAllWindows(boolean onlyVisibleWindows);
    
    /**
     * Get window title from handle (Windows only)
     * @param hwnd Window handle (HWND)
     * @return Window title string, or empty string if error
     */
    public static String getWindowTitle(HWND hwnd);
    
    /**
     * Get file path of process that owns the window (Windows only)
     * @param hwnd Window handle (HWND)
     * @return Full file path of executable, or null if error
     */
    public static String getProcessFilePath(HWND hwnd);
    
    /**
     * Get window location and size (Windows only)
     * @param hwnd Window handle (HWND)
     * @return Rectangle with window bounds
     */
    public static Rectangle getWindowLocationAndSize(HWND hwnd);
}

/**
 * Information about a desktop window (Windows only)
 */
public class DesktopWindow {
    /**
     * Create DesktopWindow with window information
     * @param hwnd Window handle
     * @param title Window title
     * @param filePath Path to executable
     * @param locAndSize Window bounds
     */
    public DesktopWindow(HWND hwnd, String title, String filePath, Rectangle locAndSize);
    
    /**
     * Get the Windows window handle
     * @return HWND window handle
     */
    public HWND getHWND();
    
    /**
     * Get window title
     * @return Window title string
     */
    public String getTitle();
    
    /**
     * Get file path of window's associated application
     * @return Full file path string
     */
    public String getFilePath();
    
    /**
     * Get window bounds
     * @return Rectangle defining window position and size
     */
    public Rectangle getLocAndSize();
}

import com.sun.jna.platform.WindowUtils;
import com.sun.jna.platform.DesktopWindow;
import javax.swing.JFrame;
import java.awt.Shape;
import java.awt.geom.Ellipse2D;
import java.util.List;

// Create a JFrame for demonstration
JFrame frame = new JFrame("Test Window");
frame.setSize(300, 200);
frame.setVisible(true);

// Apply transparency
WindowUtils.setWindowAlpha(frame, 0.7f); // 70% opacity

// Create circular mask
Shape circleMask = new Ellipse2D.Double(0, 0, 300, 200);
WindowUtils.setWindowMask(frame, circleMask);

// Get all desktop windows
List<DesktopWindow> windows = WindowUtils.getAllWindows(true);
for (DesktopWindow window : windows) {
    System.out.println("Window: " + window.getTitle());
    System.out.println("  Path: " + window.getFilePath());
    System.out.println("  Bounds: " + window.getBounds());
}

/**
 * Cross-platform keyboard state utilities
 * Provides access to the local keyboard state across platforms
 * Requires graphics environment (throws HeadlessException on headless systems)
 * Note: macOS support is not yet implemented
 */
public class KeyboardUtils {
    /**
     * Check if a specific key is currently pressed
     * @param keycode Key code to check (uses KeyEvent constants like KeyEvent.VK_A, KeyEvent.VK_SHIFT)
     * @return true if the specified key is currently pressed
     */
    public static boolean isPressed(int keycode);
    
    /**
     * Check if a specific key at a specific location is currently pressed
     * @param keycode Key code to check (uses KeyEvent constants)
     * @param location Key location (uses KeyEvent location constants like KEY_LOCATION_LEFT, KEY_LOCATION_RIGHT)
     * @return true if the specified key at the specified location is currently pressed
     */
    public static boolean isPressed(int keycode, int location);
}

import com.sun.jna.platform.KeyboardUtils;
import java.awt.event.KeyEvent;

// Check if 'A' key is pressed
boolean aPressed = KeyboardUtils.isPressed(KeyEvent.VK_A);

// Check if left Shift key is specifically pressed
boolean leftShiftPressed = KeyboardUtils.isPressed(KeyEvent.VK_SHIFT, KeyEvent.KEY_LOCATION_LEFT);

// Check if right Control key is specifically pressed  
boolean rightCtrlPressed = KeyboardUtils.isPressed(KeyEvent.VK_CONTROL, KeyEvent.KEY_LOCATION_RIGHT);

// Check if any Alt key is pressed (location unknown)
boolean altPressed = KeyboardUtils.isPressed(KeyEvent.VK_ALT);

// Example game input checking
if (KeyboardUtils.isPressed(KeyEvent.VK_W)) {
    moveForward();
}
if (KeyboardUtils.isPressed(KeyEvent.VK_A)) {
    moveLeft();
}

/**
 * Helper methods to convert between enum values and integer flags/indices
 * Supports both simple enum-to-index conversion and flag-based enum sets
 */
public class EnumUtils {
    /** Uninitialized integer flag constant */
    public static final int UNINITIALIZED = -1;
    
    /**
     * Convert enum to its ordinal index
     * @param val Enum value to convert
     * @return Index position of the enum in its declaration order
     */
    public static <E extends Enum<E>> int toInteger(E val);
    
    /**
     * Convert integer index back to enum value
     * @param idx Index position to retrieve
     * @param clazz Enum class type
     * @return Enum value at specified index, or null if idx == UNINITIALIZED
     */
    public static <E extends Enum<E>> E fromInteger(int idx, Class<E> clazz);
    
    /**
     * Convert bitwise OR'd flags to a Set of FlagEnum values
     * @param flags Bitwise combination of flag values
     * @param clazz FlagEnum class type
     * @return Set containing all enum values whose flags are set
     */
    public static <T extends FlagEnum> Set<T> setFromInteger(int flags, Class<T> clazz);
    
    /**
     * Convert Set of FlagEnum values to combined integer flags
     * @param set Set of FlagEnum values to convert
     * @return Bitwise OR combination of all flag values in the set
     */
    public static <T extends FlagEnum> int setToInteger(Set<T> set);
}

/**
 * Image processing utilities for window masking and effects
 */
public class RasterRangesUtils {
    /**
     * Convert a Shape to raster ranges for window masking
     * @param shape Shape to convert
     * @param bounds Bounds of the area
     * @return Raster ranges suitable for native masking APIs
     */
    public static int[] shapeToRasterRanges(Shape shape, Rectangle bounds);
}

import com.sun.jna.Platform;

// Check current platform and use appropriate utilities
if (Platform.isWindows()) {
    // Windows-specific operations
    FileUtils fileUtils = FileUtils.getInstance(); // Returns W32FileUtils
} else if (Platform.isMac()) {
    // macOS-specific operations  
    FileUtils fileUtils = FileUtils.getInstance(); // Returns MacFileUtils
} else if (Platform.isLinux()) {
    // Linux-specific operations
    FileUtils fileUtils = FileUtils.getInstance(); // Returns Unix FileUtils
}

// Or use cross-platform APIs directly
WindowUtils.setWindowAlpha(myWindow, 0.8f); // Works on all platforms