VisClient/org/hfbk/vis/ImageLoader.java

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package org.hfbk.vis;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.imageio.stream.MemoryCacheImageInputStream;

public class ImageLoader {
        static ImageLoader def;

        public static ImageLoader getDefault() {
                if (def == null)
                        def = new ImageLoader();
                return def;
        }

        public BufferedImage getImg(String imageUrl) {
                ImageIO.setUseCache(false);
                if (imageUrl == null)
                        return null;
                BufferedImage img = null;

                try {
                        if (! imageUrl.matches("http.*") ) imageUrl="file://"+imageUrl;
                        URL url = new URL(imageUrl);
//                      System.out.println("Fetching "+url);
                        img = ImageIO.read(new MemoryCacheImageInputStream(url.openStream()));
                } catch (Exception e) {
                        if (Prefs.current.verbose) System.out.println("ImageLoader: couldnt read " + imageUrl + ", for reason:" + e);
                }
                return img;
        }

        public static Image getRessourceImage(String iconfile) {
                try {
                        return ImageIO.read(new MemoryCacheImageInputStream(ClassLoader.getSystemResourceAsStream(iconfile)));
                } catch (IOException e) {
                        System.out.println("ImageLoader: couldnt read " + iconfile + ", for reason:" + e);
                        return null;
                }               
        }

        public String thumbUrl(String url){
                int slash=url.lastIndexOf('/');
                if (slash==-1) slash=url.lastIndexOf('\\');
                return url.substring(0,slash+1)+"thumbs"+url.substring(slash);
        }
        
        public Image getCachedThumbnail(String url) {
                if(!url.matches("http.*")) return getImg(thumbUrl(url));
                else                       return null;         
        }
        
        public Image getThumbnail(String url) {         
                BufferedImage img=null;
                
                img=getImg(url);
                if (img==null) return null;
                
                float w=img.getWidth(), h=img.getHeight();
                if(w*h<Prefs.current.thumbpixels)
                        return img;
                else {
                        double scale=Math.sqrt(Prefs.current.thumbpixels/ (w*h));
                        return img.getScaledInstance((int)(w*scale), (int)(h*scale), BufferedImage.SCALE_FAST);
                }
        }
}

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