git.gag.com Git - debian/openrocket/blob - src/net/sf/openrocket/gui/help/tours/Slide.java

   1 package net.sf.openrocket.gui.help.tours;
   2
   3 import java.awt.image.BufferedImage;
   4 import java.io.IOException;
   5 import java.lang.ref.SoftReference;
   6 import java.net.URL;
   7
   8 import javax.imageio.ImageIO;
   9
  10 /**
  11  * An individual slide in a guided tour.  It contains a image (or reference to an
  12  * image file) plus a text description (in HTML).
  13  *
  14  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  15  */
  16 public class Slide {
  17
  18         private final String imageFile;
  19         private SoftReference<BufferedImage> imageReference = null;
  20
  21         private final String text;
  22
  23
  24
  25         public Slide(String imageFile, String text) {
  26                 this.imageFile = imageFile;
  27                 this.text = text;
  28         }
  29
  30
  31
  32         public BufferedImage getImage() {
  33
  34                 // Check the cache
  35                 if (imageReference != null) {
  36                         BufferedImage image = imageReference.get();
  37                         if (image != null) {
  38                                 return image;
  39                         }
  40                 }
  41
  42                 // Otherwise load and cache
  43                 BufferedImage image = loadImage();
  44                 imageReference = new SoftReference<BufferedImage>(image);
  45
  46                 return image;
  47         }
  48
  49         public String getText() {
  50                 return text;
  51         }
  52
  53
  54
  55         private BufferedImage loadImage() {
  56                 BufferedImage img;
  57
  58                 try {
  59                         URL url = ClassLoader.getSystemResource(imageFile);
  60                         if (url != null) {
  61                                 img = ImageIO.read(url);
  62                         } else {
  63                                 //FIXME
  64                                 img = null;
  65                         }
  66                 } catch (IOException e) {
  67                         // FIXME
  68                         img = null;
  69                 }
  70
  71                 return img;
  72         }
  73 }