1 /*
2 * Created on 2003-5-23 17:06:47 by joel guo
3 *
4 * vTradEx Information Technology Inc.
5 */
6 package com.cyclops.albumbuilder;
7 import java.awt.Dimension;
8 import java.awt.Image;
9 import java.awt.image.BufferedImage;
10 import java.awt.image.ImageObserver;
11 import java.io.File;
12 import java.util.Iterator;
13
14 import javax.imageio.ImageIO;
15
16 import org.apache.stratum.lifecycle.Executable;
17 /***
18 * Add description for this class <font color="red">HERE</font>!
19 * <big><font face="黑体">惩前毖后，治病救人</font></big>
20 *
21 * @author <a href="mailto:joeblack.guo@vtradex.com">joel guo</a>
22 * @company <a href="http://www.vtradex.com">vTradEx</a>
23 * @since 2003-5-23 17:06:47
24 */
25 public class ThumbnailGenerator
26 extends AlbumBuilderComponent
27 implements Executable, ImageObserver {
28 private String targetDirectory;
29 private Dimension maxThumbnailDimension;
30 private boolean renderFinished;
31 private boolean forceOverWrite;
32 /*** Override method execute() in super class
33 * @see org.apache.stratum.lifecycle.Executable#execute()
34 */
35 public void execute() throws Exception {
36 for (Iterator i = getSourceRepository().values().iterator();
37 i.hasNext();
38 ) {
39 SourceResource sourceResource = (SourceResource) i.next();
40 try {
41 if (sourceResource == null) {
42 continue;
43 }
44 File file = generateThumnail(sourceResource);
45 logger.debug("Thumbnail " + file + " generated");
46 } catch (Exception e) {
47 logger.error(
48 "Can't generate thumbnail for source image "
49 + sourceResource,
50 e);
51 }
52 }
53 }
54 private synchronized File generateThumnail(SourceResource res)
55 throws Exception {
56 File sourceFile = res.getSourceFile();
57 File gen = new File(targetDirectory + res.getRelativePath());
58 File targetFile =
59 new File(
60 gen.getParentFile(),
61 "thumbnail" + File.separator + sourceFile.getName());
62 if (!targetFile.getParentFile().isDirectory()) {
63 targetFile.getParentFile().mkdirs();
64 }
65 if (targetFile.isFile()
66 && targetFile.lastModified() > sourceFile.lastModified()
67 && !forceOverWrite) {
68 logger.debug("File " + targetFile + "already exists!");
69 return targetFile;
70 }
71 BufferedImage sourceImage = ImageIO.read(sourceFile);
72 Dimension sourceSize =
73 new Dimension(sourceImage.getWidth(), sourceImage.getHeight());
74 res.setSize(sourceSize);
75 Dimension thumbnailSize = getThumbnailSize(sourceSize);
76 Image temp =
77 sourceImage.getScaledInstance(
78 (int) thumbnailSize.getWidth(),
79 (int) thumbnailSize.getHeight(),
80 Image.SCALE_AREA_AVERAGING);
81 BufferedImage targetImage =
82 new BufferedImage(
83 (int) thumbnailSize.getWidth(),
84 (int) thumbnailSize.getHeight(),
85 BufferedImage.TYPE_INT_RGB);
86 renderFinished = false;
87 targetImage.getGraphics().drawImage(temp, 0, 0, this);
88 while (!renderFinished) {
89 Thread.sleep(100);
90 }
91 ImageIO.write(targetImage, "jpeg", targetFile);
92 return targetFile;
93 }
94 private Dimension getThumbnailSize(Dimension d) {
95 double xRatio = maxThumbnailDimension.getWidth() / d.getWidth();
96 double yRatio = maxThumbnailDimension.getHeight() / d.getHeight();
97 double ratio = Math.min(xRatio, yRatio);
98 return new Dimension(
99 (int) (ratio * d.getWidth()),
100 (int) (ratio * d.getHeight()));
101 }
102 /*** Override method imageUpdate() in super class
103 * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
104 */
105 public boolean imageUpdate(
106 Image img,
107 int infoflags,
108 int x,
109 int y,
110 int width,
111 int height) {
112 renderFinished = ((infoflags & FRAMEBITS) > 0);
113 return true;
114 }
115 /*** Override method initialize() of super class
116 * @see org.apache.stratum.lifecycle.Initializable#initialize()
117 */
118 public void initialize() {
119 super.initialize();
120 targetDirectory =
121 getConfiguration().getString("target.directory", "target/docs/album");
122 int maxWidth =
123 getConfiguration().getInt("generation.thumbnail.maxwidth", 100);
124 int maxHeight =
125 getConfiguration().getInt("generation.thumbnail.maxheight", 100);
126 maxThumbnailDimension = new Dimension(maxWidth, maxHeight);
127 forceOverWrite =
128 getConfiguration().getBoolean("generation.forceoverwrite", false);
129 }
130 }
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