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+/* AsyncImage.java -- Loads images asynchronously
+ Copyright (C) 2008 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.awt.image;
+
+
+import java.awt.Graphics;
+import java.awt.Image;
+import java.awt.image.ImageConsumer;
+import java.awt.image.ImageObserver;
+import java.awt.image.ImageProducer;
+import java.util.HashSet;
+import java.util.Iterator;
+
+/**
+ * Supports asynchronous loading of images.
+ */
+public class AsyncImage
+ extends Image
+{
+
+ /**
+ * The image source for AsyncImages.
+ */
+ private class AsyncImageSource
+ implements ImageProducer
+ {
+ /**
+ * The real image source, if already present, or <code>null</code>
+ * otherwise.
+ */
+ private ImageProducer realSource;
+
+ public void addConsumer(ImageConsumer ic)
+ {
+ startProduction(ic);
+ }
+
+ public boolean isConsumer(ImageConsumer ic)
+ {
+ return false;
+ }
+
+ public void removeConsumer(ImageConsumer ic)
+ {
+ // Nothing to do here.
+ }
+
+ public void requestTopDownLeftRightResend(ImageConsumer ic)
+ {
+ startProduction(ic);
+ }
+
+ public void startProduction(ImageConsumer ic)
+ {
+ ImageProducer ip = getRealSource();
+ if (ip == null)
+ {
+ ic.setDimensions(1, 1);
+ ic.imageComplete(ImageConsumer.SINGLEFRAMEDONE);
+ }
+ else
+ {
+ ip.startProduction(ic);
+ }
+ }
+
+ /**
+ * Returns the real image source, if already present. Otherwise, this
+ * returns <code>null</code>.
+ *
+ * @return the real image source, or <code>null</code> if not present
+ */
+ private ImageProducer getRealSource()
+ {
+ synchronized (AsyncImage.this)
+ {
+ ImageProducer source = realSource;
+ if (source == null)
+ {
+ Image ri = realImage;
+ if (ri != null)
+ {
+ realSource = source = ri.getSource();
+ }
+ }
+ return source;
+ }
+ }
+ }
+
+ /**
+ * The real image. This is null as long as the image is not complete.
+ */
+ private volatile Image realImage;
+
+ /**
+ * The image observers.
+ *
+ * This is package private to avoid accessor methods.
+ */
+ HashSet<ImageObserver> observers;
+
+ private volatile boolean complete = false;
+
+ /**
+ * Creates a new AsyncImage.
+ */
+ AsyncImage()
+ {
+ observers = new HashSet<ImageObserver>();
+ }
+
+ public void flush()
+ {
+ // Nothing to do here.
+ }
+
+ public Graphics getGraphics()
+ {
+ Image r = realImage;
+ Graphics g = null;
+ if (r != null)
+ g = r.getGraphics(); // Should we return some dummy graphics instead?
+ return g;
+ }
+
+ public boolean isComplete() {
+ return complete;
+ }
+
+ public int getHeight(ImageObserver observer)
+ {
+ addObserver(observer);
+ int height = -1;
+ waitForImage(observer);
+ Image r = realImage;
+ if (r != null)
+ height = r.getHeight(observer);
+ return height;
+ }
+
+ public Object getProperty(String name, ImageObserver observer)
+ {
+ addObserver(observer);
+ Image r = realImage;
+ Object prop = null;
+ if (r != null)
+ prop = r.getProperty(name, observer);
+ return prop;
+ }
+
+ public ImageProducer getSource()
+ {
+ return new AsyncImageSource();
+ }
+
+ public int getWidth(ImageObserver observer)
+ {
+ addObserver(observer);
+ int width = -1;
+ waitForImage(observer);
+ Image r = realImage;
+ if (r != null)
+ width = r.getWidth(observer);
+ return width;
+ }
+
+ public void addObserver(ImageObserver obs)
+ {
+ if (obs != null)
+ {
+ synchronized (this)
+ {
+ // This field gets null when image loading is complete and we don't
+ // need to store any more observers.
+ HashSet<ImageObserver> observs = observers;
+ if (observs != null)
+ {
+ observs.add(obs);
+ }
+ }
+ }
+ }
+
+ public boolean prepareImage(int w, int h, ImageObserver obs)
+ {
+ addObserver(obs);
+ return realImage != null;
+ }
+
+ public int checkImage(int w, int h, ImageObserver obs)
+ {
+ addObserver(obs);
+ int flags = 0;
+ if (realImage != null)
+ flags = ImageObserver.ALLBITS | ImageObserver.WIDTH
+ | ImageObserver.HEIGHT | ImageObserver.PROPERTIES;
+ return flags;
+ }
+
+ public Image getRealImage()
+ {
+ return realImage;
+ }
+
+ public void setRealImage(Image im)
+ {
+ realImage = im;
+ int status = ImageObserver.HEIGHT | ImageObserver.WIDTH;
+ notifyObservers(status, 0, 0, im.getWidth(null), im.getHeight(null));
+ }
+
+ public void notifyObservers(int status, int x, int y, int w, int h)
+ {
+ synchronized (this)
+ {
+ HashSet observs = observers;
+ if (observs != null)
+ {
+ Iterator i = observs.iterator();
+ while (i.hasNext())
+ {
+ ImageObserver obs = (ImageObserver) i.next();
+ boolean complete = obs.imageUpdate(this, status, x, y, realImage.getWidth(obs), realImage.getHeight(obs));
+ if (complete) // Remove completed observers.
+ i.remove();
+ }
+ }
+ if ((status & ImageObserver.ALLBITS) != 0)
+ {
+ complete = true;
+ notifyAll();
+ }
+ }
+ }
+
+ /**
+ * Waits for the image to be loaded completely, if the image observer
+ * is <code>null</code>. Otherwise this is not necessary, because the
+ * image observer can be notified about later completion.
+ *
+ * @param observer the image observer
+ */
+ public void waitForImage(ImageObserver observer)
+ {
+ if (!complete && observer == null)
+ {
+ synchronized (this)
+ {
+ while (! complete)
+ {
+ try
+ {
+ wait();
+ }
+ catch (InterruptedException ex)
+ {
+ Thread.currentThread().interrupt();
+ }
+ }
+ }
+ }
+ }
+}