source: trunk/faces/apollo/src/org/apollo/io/IconRepository.java@ 759

package org.apollo.io;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.net.URL;
import java.util.HashMap;

import javax.swing.Icon;
import javax.swing.ImageIcon;

import org.apollo.gui.Strokes;

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

        private IconRepository() {}
        
        private static Icon getMissingIcon() {
                
                if (missingIcon == null) {
                        
                        Image image = new BufferedImage(16, 16, BufferedImage.TYPE_INT_RGB);
                        Graphics2D g = (Graphics2D)image.getGraphics();
                        
                        g.setStroke(Strokes.SOLID_2);
                        
                        // White square with X
                        g.setColor(Color.WHITE);
                        g.fillRect(0, 0, 16, 16);
                        
                        g.setColor(Color.RED);
                        g.drawLine(0, 0, 16, 16);
                        g.drawLine(0, 16, 16, 0);
                        
                        missingIcon = new ImageIcon(image);
                }
                        
                return missingIcon;
        }
        
        /**
         * 
         * @param name Exclude path / package
         * @return
         */
        public static Icon getIcon(String name) {
                Icon 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 = new ImageIcon(url);
                                }
                                
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                        
                        if (icon == null) { 
                                System.err.println("WARNING: Cannot find icon named \"" + name +"\"");
                                return getMissingIcon();
                        }
                } 
                
                return icon;
        }
        
}