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package org.cristalise.gui;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Hashtable;
import javax.swing.ImageIcon;
import org.cristalise.kernel.common.ObjectNotFoundException;
import org.cristalise.kernel.process.Gateway;
import org.cristalise.kernel.utils.Logger;
public class ImageLoader {
static private Hashtable<String, ImageIcon> imgCache = new Hashtable<String, ImageIcon>();
static public final ImageIcon nullImg = new ImageIcon(new byte[] { 0 });
static private final ArrayList<String> reportedMissingIcons = new ArrayList<String>();
/**
* Gets an image from the resource directories
*
* @param resName - filename after resources/images
* @return
*/
static public ImageIcon findImage(String resName) {
try {
for (String ns : Gateway.getResource().getModuleBaseURLs().keySet()) {
try {
return getImage(ns, resName);
} catch (ObjectNotFoundException ex) { }
}
return getImage(null, resName);
} catch (ObjectNotFoundException ex) {
if (!reportedMissingIcons.contains(resName)) {
Logger.warning("Image '"+resName+"' not found. Using null icon");
reportedMissingIcons.add(resName);
}
return nullImg;
}
}
static public ImageIcon getImage(String ns, String resName) throws ObjectNotFoundException {
if (resName == null)
return nullImg;
if (imgCache.containsKey(ns+'/'+resName)) {
return imgCache.get(ns+'/'+resName);
}
URL imgLocation = null;
if (ns == null)
try {
imgLocation = Gateway.getResource().getKernelResourceURL("images/"+resName);
} catch (MalformedURLException ex) { }
else
try {
imgLocation = Gateway.getResource().getModuleResourceURL(ns, "images/"+resName);
} catch (MalformedURLException ex) { }
if (imgLocation!= null) {
ImageIcon newImg = new ImageIcon(imgLocation);
if (newImg.getIconHeight() > -1) {
imgCache.put(ns+'/'+resName, newImg);
Logger.msg(3, "Loaded "+resName+" "+newImg.getIconWidth()+"x"+newImg.getIconHeight());
return newImg;
}
}
throw new ObjectNotFoundException();
}
}
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