IO utilities

Clipboard manipulation

OneConfig no longer provides in-house utilities for managing the user's clipboard; however, we do include Deftu's Copycat library, which uses native code to bypass any issues brought on by certain operating systems (such as macOS disallowing headless apps from using the AWT clipboard API).

Obtaining a clipboard instance

Clipboard clipboard = Clipboard.getInstance();

The default implementation of Clipboard uses the natives provided by Copycat. Calling the getInstance method will automatically load the natives should it need to.

Copying and getting strings

Java

String clipboardString = clipboard.getString();
if (clipboardString == null) {
    // If the user does not have anything copied, or the copied content
    // is not a string (if, f.ex, it's an image), then the `getString`
    // method returns null.
    return;
}

String newClipboardString = "Hello, OneConfig!";
clipboard.setString(newClipboardString); // Copies our string to the user's clipboard

Kotlin

Copying and getting images

Java

ClipboardImage clipboardImage = clipboard.getImage();
if (clipboardString == null) {
    // If the user does not have anything copied, or the copied content
    // is not a string (if, f.ex, it's an image), then the `getString`
    // method returns null.
    return;
}

ClipboardImage newClipboardImage = null; // Obtain your image somehow...
clipboard.setImage(newClipboardImage); // Copies our string to the user's clipboard

Kotlin

By default, ClipboardImage on it's own is simply two ints for the width x height, and an array of bytes for the raw image data. Thus meaning, that should you want to make use of it in any meaningful way, you'll need to convert it to another type for another library OR handle the raw bytes on your own. Thankfully, Copycat provides a means of converting to and from the Java AWT types for you, which you can find below.

Copying AWT images (BufferedImage)

Java

BufferedImage ourImage = ImageIO.read("/path/to/your/image");
// Now, we can't simply copy the above image as it is because we need
// a ClipboardImage, not a BufferedImage.

// So, we'll convert it using this subtype.
ClipboardImage ourClipboardImage = BufferedClipboardImage.toClipboardImage(ourImage);

// Now, we can finally copy it.
Clipboard clipboard = Clipboard.getInstance();
clipboard.setImage(ourClipboardImage);

Kotlin

This works vice-versa too!

Java

Clipboard clipboard = Clipboard.getInstance();
ClipboardImage clipboardImage = clipboard.getImage();

// Now, we just need to convert it to a BufferedImage
BufferedImage image = BufferedClipboardImage.toBufferedImage(clipboardImage);

Kotlin

File checksums (SHA-256 only)

OneConfig provides a single, ease-to-use method for obtaining the checksum of a file at a given path.

Java

Path myFilePath = Paths.get("/path/to/your/file");
String sha256Checksum = IOUtils.getFileChecksum(myFilePath);

// Couldn't obtain the file's checksum
if (sha256Checksum.isEmpty()) {
    return;
}

Kotlin