source: trunk/src/org/apollo/io/IconRepository.java

package org.apollo.io;

import java.net.URL;
import java.util.HashMap;

import org.apollo.gui.Strokes;
import org.expeditee.core.Colour;
import org.expeditee.core.Image;
import org.expeditee.core.Line;
import org.expeditee.gio.EcosystemManager;
import org.expeditee.gio.GraphicsManager;

/**
 * An icon provider. Only loads icons once and when they are requested (simple proxy approach).
 * 
 * @author Brook Novak
 *
 */
public final class IconRepository {
        
        private static HashMap<String, Image> _loadedIcons = new HashMap<String, Image>();
        
        private static Image missingIcon = null;

        private IconRepository()
        {
        }
        
        private static Image getMissingIcon()
        {
                if (missingIcon == null) {
                        
                        Image image = EcosystemManager.getImageManager().createImage(16, 16, false);
                        
                        GraphicsManager g = EcosystemManager.getGraphicsManager();
                        
                        g.pushDrawingSurface(image);
                        
                        g.clear(Colour.WHITE);

                        Line l1 = new Line(0, 0, 16, 16);
                        Line l2 = new Line(0, 16, 16, 0);

                        g.drawLine(l1, Colour.RED, Strokes.SOLID_2);
                        g.drawLine(l2, Colour.RED, Strokes.SOLID_2);
                        
                        g.popDrawingSurface();
                        
                        missingIcon = image;
                }
                        
                return missingIcon;
        }
        
        /**
         * 
         * @param name Exclude path / package
         * @return
         */
        public static Image getIcon(String name)
        {
                Image icon = _loadedIcons.get(name);
                
                if (icon == null) {
                        try {
                                URL url;
                                ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
                                if (classLoader!=null) {
                                    // Applet friendly
                                    url = classLoader.getResource("org/apollo/assets/icons/" + name);
                                } else {
                                    url = ClassLoader.getSystemResource("org/apollo/assets/icons/" + name);
                                }

                                if (url != null) icon = Image.getImage(url);
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                        
                        if (icon == null) { 
                                System.err.println("WARNING: Cannot find icon named \"" + name +"\"");
                                return getMissingIcon();
                        }
                } 
                
                return icon;
        }
        
}