LoadURLTask.java

/**
 * Copyright (C) 2008-2010 Daniel Senff
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package de.danielsenff.imageflow.tasks;

import java.io.File;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.JOptionPane;

import org.jdesktop.application.Task;

import de.danielsenff.imageflow.ImageFlow;
import de.danielsenff.imageflow.ImageFlowView;
import de.danielsenff.imageflow.controller.GraphController;


/**
 * Abstract Task for loading files.
 * @author tomka
 *
 * @param <T>
 * @param <V>
 */
public abstract class LoadURLTask<T, V> extends Task<T, V> {

	protected boolean modified = false;
	private static final Logger logger = Logger.getLogger(ImageFlowView.class.getName());

	/**
	 * Url that is loaded.
	 */
	protected final URL url;

	protected ImageFlowView view;

	/**
	 * Construct the LoadFileTask object.  The constructor
	 * will run on the EDT, so we capture a reference to the
	 * File to be loaded here.  To keep things simple, the
	 * resources for this Task are specified to be in the same
	 * ResourceMap as the DocumentEditorView class's resources.
	 * They're defined in resources/DocumentEditorView.properties.
	 */
	public LoadURLTask(final URL url) {
		super(ImageFlow.getApplication());
		this.url = url;
		this.view = (ImageFlowView) ImageFlow.getApplication().getMainView();
	}

	/**
	 * Called on the EDT if doInBackground completes without
	 * error and this Task isn't cancelled.  We update the
	 * GUI as well as the file and modified properties here.
	 * @param graphController
	 */
	@Override
	protected void succeeded(final T graphController) {
		this.view.setFile(new File(this.url.getFile()));
		this.view.setGraphController((GraphController)graphController);
		this.view.setModified(false);
		ImageFlowView.getProgressBar().setIndeterminate(false);
		ImageFlowView.getProgressBar().setVisible(false);
		//textArea.setText(fileContents);
    	super.succeeded(graphController);
	}

	/**
	 * Url this task is handling.
	 * @return
	 */
	public URL getURL() {
		return url;
	}

	@Override
	protected void cancelled() {
		ImageFlowView.getProgressBar().setIndeterminate(false);
		ImageFlowView.getProgressBar().setVisible(false);
		super.cancelled();
	}

	/* Called on the EDT if doInBackground fails because
	 * an uncaught exception is thrown.  We show an error
	 * dialog here.  The dialog is configured with resources
	 * loaded from this Tasks's ResourceMap.
	 */
	@Override
	protected void failed(final Throwable e) {
		logger.log(Level.WARNING, "couldn't load " + getURL(), e);
		final String msg = getResourceMap().getString("loadFailedMessage", getURL());
		final String title = getResourceMap().getString("loadFailedTitle");
		final int type = JOptionPane.ERROR_MESSAGE;
		ImageFlowView.getProgressBar().setIndeterminate(false);
		ImageFlowView.getProgressBar().setVisible(false);
		JOptionPane.showMessageDialog(ImageFlow.getApplication().getMainFrame(), msg, title, type);
	}

}