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TOVAL comprises a set of java classes for common programming issues. It includes utils for arrays, lists, sets and collections for convenient handling and modification, but also support for mathematic definitions concerning logic (clauses + resolution) together with some algorithms for permutations, powersets and resolution. Additionally it contains a number of types for multisets, matrices with object keys and much more.

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package de.invation.code.toval.graphic.component;


import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

import de.invation.code.toval.icons.IconFactory;
import de.invation.code.toval.thread.ExecutorListener;
import de.invation.code.toval.thread.SingleThreadExecutorService;
import de.invation.code.toval.validate.ExceptionDialog;
import de.invation.code.toval.validate.Validate;

public abstract class ExecutorLabel extends JLabel implements ExecutorListener {
	
	private static final long serialVersionUID = 8368680392887232591L;
	private static final Dimension DEFAULT_SIZE = new Dimension(40,40);
	public static final Color COLOR_INITIAL = Color.BLUE;
	public static final Color COLOR_DONE = Color.GREEN;
	public static final Color COLOR_CANCELLED = Color.LIGHT_GRAY;
	public static final Color COLOR_EXCEPTION = Color.RED;
	
	protected SingleThreadExecutorService executorService = null;
	
	private boolean running = false;
	
	public ExecutorLabel(){
		super();
		
		setPreferredSize(DEFAULT_SIZE);
		setMinimumSize(DEFAULT_SIZE);
		setMaximumSize(DEFAULT_SIZE);
		setOpaque(true);
		setBackground(COLOR_INITIAL);
		
		addMouseListener(new MouseAdapter() {

			@Override
			public void mouseClicked(MouseEvent e) {
				if(!isEnabled())
					return;
				if(!running){
					// Start executor service
					try {
						startExecutor();
					} catch (Exception e1) {
						ExceptionDialog.showException(SwingUtilities.getWindowAncestor(ExecutorLabel.this), "Execution exception", new Exception("Exception while starting execution.", e1), true);
					}
				} else {
					// Stop executor service
					try {
						stopExecutor();
					} catch (Exception e1) {
						ExceptionDialog.showException(SwingUtilities.getWindowAncestor(ExecutorLabel.this), "Execution exception", new Exception("Exception while stopping execution.", e1), true);
					}
				}
			}
		});
	}

	public ExecutorLabel(SingleThreadExecutorService executorService){
		this();
		setExecutor(executorService);
	}
	
	public void setExecutor(SingleThreadExecutorService executorService){
		Validate.notNull(executorService);
		executorService.addExecutorListener(this);
		this.executorService = executorService;
	}
	
	protected synchronized void startExecutor() throws Exception{
		executorService.setUpAndRun();
	}
	
	protected void setGraphicsRunning() {
		setOpaque(false);
		setIcon(getLoadingDotsIcon());
		if(executorService.isDone())
			setGraphicsFinished();
	}
	
	protected synchronized void stopExecutor() throws Exception{
		executorService.stop();
	}
	
	protected Color getColorInitial(){
		return COLOR_INITIAL;
	}
	
	protected Color getColorCancelled(){
		return COLOR_CANCELLED;
	}
	
	protected Color getColorDone(){
		return COLOR_DONE;
	}
	
	protected Color getColorException(){
		return COLOR_EXCEPTION;
	}
	
	protected void setGraphicsInitial() {
		setOpaque(true);
		setIcon(null);
		setBackground(getColorInitial());
	}
	
	protected void setGraphicsCancelled() {
		setOpaque(true);
		setIcon(null);
		setBackground(getColorCancelled());
	}
	
	protected void setGraphicsException() {
		setOpaque(true);
		setIcon(null);
		setBackground(getColorException());
	}
	
	protected void setGraphicsFinished() {
		setOpaque(true);
		setIcon(null);
		setBackground(getColorDone());
	}

	static ImageIcon getLoadingDotsIcon() {
		String path = "loading-dots.gif";
		URL imageURL = IconFactory.class.getResource(path);
		return new ImageIcon(imageURL);
	}

	@Override
	public void executorStarted() {
		running = true;
		setGraphicsRunning();
	}

	@Override
	public void executorStopped() {
		running = false;
		setGraphicsCancelled();
	}

	@Override
	public void executorFinished(Z result) {
		running = false;
		setGraphicsFinished();
	}
	
	@Override
	public void executorException(Exception exception) {
		running = false;
		setGraphicsException();
	}

	@Override
	public void progress(double progress) {}
	
	public void reset() throws Exception{
		if(executorService != null && !executorService.isDone()){
			stopExecutor();
		} else {
			setGraphicsInitial();
		}
	}

}