git.gag.com Git - debian/openrocket/blob - core/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         private static final String NO_IMAGE = "none";
  18
  19         private final String imageFile;
  20         private SoftReference<BufferedImage> imageReference = null;
  21
  22         private final String text;
  23
  24
  25
  26         public Slide(String imageFile, String text) {
  27                 this.imageFile = imageFile;
  28                 this.text = text;
  29         }
  30
  31
  32
  33         public BufferedImage getImage() {
  34
  35                 if (imageFile.equals(NO_IMAGE)) {
  36                         return new BufferedImage(0, 0, BufferedImage.TYPE_INT_ARGB);
  37                 }
  38
  39                 // Check the cache
  40                 if (imageReference != null) {
  41                         BufferedImage image = imageReference.get();
  42                         if (image != null) {
  43                                 return image;
  44                         }
  45                 }
  46
  47                 // Otherwise load and cache
  48                 BufferedImage image = loadImage();
  49                 imageReference = new SoftReference<BufferedImage>(image);
  50
  51                 return image;
  52         }
  53
  54         public String getText() {
  55                 return text;
  56         }
  57
  58
  59
  60         private BufferedImage loadImage() {
  61                 BufferedImage img;
  62
  63                 try {
  64                         URL url = ClassLoader.getSystemResource(imageFile);
  65                         if (url != null) {
  66                                 img = ImageIO.read(url);
  67                         } else {
  68                                 //FIXME
  69                                 img = null;
  70                         }
  71                 } catch (IOException e) {
  72                         // FIXME
  73                         img = null;
  74                 }
  75
  76                 return img;
  77         }
  78 }