/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pivot.wtk.media;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.concurrent.ExecutorService;
import org.apache.pivot.io.IOTask;
import org.apache.pivot.serialization.SerializationException;
import org.apache.pivot.util.ListenerList;
import org.apache.pivot.util.concurrent.TaskExecutionException;
import org.apache.pivot.util.concurrent.TaskListener;
import org.apache.pivot.wtk.Dimensions;
import org.apache.pivot.wtk.Visual;
import com.kitfox.svg.SVGDiagram;
/**
* Abstract base class for images. An image is either a bitmapped "picture"
* or a vector "drawing".
*/
public abstract class Image implements Visual {
/**
* Image listener list.
*/
protected static class ImageListenerList extends ListenerList<ImageListener>
implements ImageListener {
@Override
public void sizeChanged(Image image, int previousWidth, int previousHeight) {
for (ImageListener listener : this) {
listener.sizeChanged(image, previousWidth, previousHeight);
}
}
@Override
public void baselineChanged(Image image, int previousBaseline) {
for (ImageListener listener : this) {
listener.baselineChanged(image, previousBaseline);
}
}
@Override
public void regionUpdated(Image image, int x, int y, int width, int height) {
for (ImageListener listener : this) {
listener.regionUpdated(image, x, y, width, height);
}
}
}
/**
* Task that executes an image load operation.
*/
public static class LoadTask extends IOTask<Image> {
private URL location = null;
public LoadTask(URL location) {
this(location, DEFAULT_EXECUTOR_SERVICE);
}
public LoadTask(URL location, ExecutorService executorService) {
super(executorService);
this.location = location;
}
public URL getLocation() {
return location;
}
@Override
public Image execute() throws TaskExecutionException {
Image image = null;
try {
InputStream inputStream = null;
try {
// NOTE We don't open the stream until the callback executes because
// this is a potentially time-consuming operation
inputStream = new MonitoredInputStream(new BufferedInputStream(location.openStream()));
if (location.getFile().endsWith(SVGDiagramSerializer.SVG_EXTENSION)) {
SVGDiagramSerializer serializer = new SVGDiagramSerializer();
SVGDiagram diagram = serializer.readObject(inputStream);
image = new Drawing(diagram);
} else {
BufferedImageSerializer serializer = new BufferedImageSerializer();
BufferedImage bufferedImage = serializer.readObject(inputStream);
image = new Picture(bufferedImage);
}
} finally {
if (inputStream != null) {
inputStream.close();
}
}
} catch (IOException exception) {
throw new TaskExecutionException(exception);
} catch (SerializationException exception) {
throw new TaskExecutionException(exception);
}
return image;
}
}
protected ImageListenerList imageListeners = new ImageListenerList();
@Override
public int getBaseline() {
return -1;
}
public Dimensions getSize() {
return new Dimensions(getWidth(), getHeight());
}
public void update(int x, int y, int width, int height) {
imageListeners.regionUpdated(this, x, y, width, height);
}
public ListenerList<ImageListener> getImageListeners() {
return imageListeners;
}
public static Image load(URL location) throws TaskExecutionException {
LoadTask loadTask = new LoadTask(location);
return loadTask.execute();
}
public static Image.LoadTask load(URL location, TaskListener<Image> loadListener) {
LoadTask loadTask = new LoadTask(location);
loadTask.execute(loadListener);
return loadTask;
}
}