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package org.monte.media.gui;

import javax.swing.SwingUtilities;


public abstract class Worker implements Runnable {

    private T value;
    private Throwable error;

    
    @Override
    public final void run() {
        try {
            setValue(construct());
        } catch (Throwable e) {
            setError(e);
            SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    failed(getError());
                    finished();
                }
            });
            return;
        }
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                done(getValue());
                finished();
            }
        });
    }

    
    protected abstract T construct() throws Exception;

    
    protected void done(T value) {
    }

    
    protected void failed(Throwable error) {
        error.printStackTrace();
    }

    
    protected void finished() {
    }

    
    public synchronized T getValue() {
        return value;
    }

    
    private synchronized void setValue(T x) {
        value = x;
    }

    
    protected synchronized Throwable getError() {
        return error;
    }

    
    private synchronized void setError(Throwable x) {
        error = x;
    }

    
    public void start() {
        new Thread(this).start();
    }
}