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CRISTAL-iSE default/administration GUI
There is a newer version: 6.0.0
/**
 * This file is part of the CRISTAL-iSE default user interface.
 * Copyright (c) 2001-2016 The CRISTAL Consortium. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 3 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * http://www.fsf.org/licensing/licenses/lgpl.html
 */
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 imgCache = new Hashtable();
    static public final ImageIcon nullImg = new ImageIcon(new byte[] { 0 });
    static private final ArrayList reportedMissingIcons = new ArrayList();

    /**
     * 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();
    }

}