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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.swing;

import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import net.sourceforge.plantuml.SourceStringReader;
import net.sourceforge.plantuml.core.DiagramDescription;
import net.sourceforge.plantuml.security.SImageIO;
import net.sourceforge.plantuml.utils.Log;

public class ClipboardLoop {
	// ::remove file when __CORE__

	public static void runLoop() throws IOException, InterruptedException {
		final ClipboardLoop clipboardLoop = new ClipboardLoop();
		while (true) {
			final String text = clipboardLoop.getClipboardText();
			if (clipboardLoop.isTextOk(text)) {
				clipboardLoop.runText(text);
			}
			Thread.sleep(10000L);
		}
	}

	public static void runOnce() throws IOException, InterruptedException {
		final ClipboardLoop clipboardLoop = new ClipboardLoop();
		final String text = clipboardLoop.getClipboardText();
		if (clipboardLoop.isTextOk(text)) {
			clipboardLoop.runText(text);
		} else {
			clipboardLoop.setClipboardImage(new BufferedImage(10, 10, BufferedImage.TYPE_INT_ARGB));
		}

	}

	private boolean isTextOk(String text) {
		if (text == null) {
			return false;
		}
		return text.startsWith("@start");
	}

	private void runText(String text) throws IOException, InterruptedException {
		Log.info("Getting some text from clipboard");
		final SourceStringReader source = new SourceStringReader(text);
		final ByteArrayOutputStream baos = new ByteArrayOutputStream();
		final DiagramDescription desc = source.outputImage(baos);
		if (desc == null) {
			Log.info("No image generated");
		} else {
			Log.info("Image ok " + desc.getDescription());
			baos.close();
			final BufferedImage image = SImageIO.read(baos.toByteArray());
			setClipboardImage(image);
			Log.info("Image copied in clipboard");
		}
	}

	private String getClipboardText() {
		final Transferable t = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);
		try {
			if (t != null && t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
				final String text = (String) t.getTransferData(DataFlavor.stringFlavor);
				return text;
			}
		} catch (UnsupportedFlavorException e) {
			Log.error(e.toString());
		} catch (IOException e) {
			Log.error(e.toString());
		}
		return null;
	}

	private void setClipboardImage(BufferedImage image) {
		final Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
		clipboard.setContents(new ImageSelection(image), null);
	}

}