/*
 * Copyright (c) 2006-2010 Chris Smith, Shane Mc Cormack, Gregory Holmes
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.addons.ui_swing.textpane;

import com.dmdirc.addons.ui_swing.components.LoggingSwingWorker;
import com.dmdirc.logger.ErrorLevel;
import com.dmdirc.logger.Logger;

import java.awt.Image;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.ExecutionException;

import javax.imageio.ImageIO;

/**
 * Loads a background image in the background.
 */
public class BackgroundImageLoader extends LoggingSwingWorker<Image, Void> {

    /** URL of image file to load. */
    private final URL imageURL;
    /** Textpane canvas to load image for. */
    private final TextPaneCanvas canvas;

    /**
     * Creates a new background image loader.
     *
     * @param canvas Canvas we're loading image for
     * @param url URL of image to load
     */
    public BackgroundImageLoader(final TextPaneCanvas canvas, final URL url) {
        super();
        imageURL = url;
        this.canvas = canvas;
    }

    /** {@inheritDoc} */
    @Override
    protected Image doInBackground() throws Exception {
        try {
            if (imageURL != null) {
                return ImageIO.read(imageURL);
            }
            return null;
        } catch (IOException ex) {
            return null;
        }
    }

    /** {@inheritDoc} */
    @Override
    protected void done() {
        if (isCancelled()) {
            return;
        }
        try {
            canvas.setBackgroundImage(get());
        } catch (InterruptedException ex) {
            canvas.setBackgroundImage(null);
        } catch (ExecutionException ex) {
            Logger.appError(ErrorLevel.MEDIUM, ex.getMessage(), ex);
        }
    }
}
